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Showing 1-20 of about 21 results.
Revisiting the Formation of HeH+ in the Planetary Nebula NGC 7027Forrey, R. C.Babb, James F.Courtney, E. D. S.McArdle, R. T.Stancil, P. C.DOI: info:10.3847/1538-4357/ab9a50v. 89886
Forrey, R. C., Babb, James F., Courtney, E. D. S., McArdle, R. T., and Stancil, P. C. 2020. "Revisiting the Formation of HeH+ in the Planetary Nebula NGC 7027." The Astrophysical Journal 898:86. https://doi.org/10.3847/1538-4357/ab9a50
ID: 157826
Type: article
Authors: Forrey, R. C.; Babb, James F.; Courtney, E. D. S.; McArdle, R. T.; Stancil, P. C.
Abstract: From four independent calculations using three different theoretical approaches, rate coefficients for the formation of HeH+ via the radiative association of He+ and H were computed. Good agreement is found between our new calculations and prior results obtained two decades ago for kinetic temperatures between ∼800 and 20,000 K. This finding is inconsistent with a recent claim in the literature of a wide variation in published values and establishes the robustness of our knowledge of this process for the formation of HeH+. The implications of the current results to the first detection of HeH+ and its modeled abundance in the planetary nebula NGC 7027 are discussed.
Long-range interaction of Li (2 2S) -Li (2 2S) -Li+(1 1S )Yan, Pei-GenTang, Li-YanYan, Zong-ChaoBabb, James F.DOI: info:10.1103/PhysRevA.101.032702v. 101032702
Yan, Pei-Gen, Tang, Li-Yan, Yan, Zong-Chao, and Babb, James F. 2020. "Long-range interaction of Li (2 2S) -Li (2 2S) -Li+(1 1S )." Physical Review A 101:032702. https://doi.org/10.1103/PhysRevA.101.032702
ID: 157850
Type: article
Authors: Yan, Pei-Gen; Tang, Li-Yan; Yan, Zong-Chao; Babb, James F.
Abstract: The long-range interactions among two- or three-atom systems are of considerable importance in the cold and ultracold research areas for many-body systems. For an ion and an atom, the long-range interaction potential is dominated by the induction (or polarization) potential resulting from the (classical) effect of the ion's electric field on the atom and the leading term of the induction potential is much stronger than the (quantum mechanical) dispersion (or van der Waals) interaction. The present paper focuses on the long-range interaction of the Li (2 2S) -Li (2 2S) -Li+(1 1S) system, to see what changes this induction effect (originating in the electric field of the Li+ ion) yields in the long-range additive and nonadditive interactions of this three-body system. Using perturbation theory for energies, we evaluate the coefficients Cn in the potential energy for the three well-separated constituents, where n refers to the corresponding order in inverse powers of distance, obtaining the additive interaction coefficients C4, C6, C7, C8, C9 and the nonadditive interaction coefficients C7, C9. The obtained coefficients Cn are calculated with highly accurate variationally generated nonrelativistic wave functions in Hylleraas coordinates. Our calculations may be of interest for the study of three-body recombination and for constructing precise potential energy surfaces. We also provide precise evaluations of the long-range potentials for the two-body Li (2 2S) -Li+(1 1S) system. For both the two-body and three-body cases, we provide results for the like-nuclei cases of 6Li and 7Li.
Dicarbon Formation in Collisions of Two Carbon AtomsBabb, James F.Smyth, R. T.McLaughlin, B. M.DOI: info:10.3847/1538-4357/ab1088v. 87638
Babb, James F., Smyth, R. T., and McLaughlin, B. M. 2019. "Dicarbon Formation in Collisions of Two Carbon Atoms." The Astrophysical Journal 876:38. https://doi.org/10.3847/1538-4357/ab1088
ID: 151820
Type: article
Authors: Babb, James F.; Smyth, R. T.; McLaughlin, B. M.
Abstract: Radiative association cross sections and rates are computed, using a quantum approach, for the formation of C2 molecules (dicarbon) during the collision of two ground-state C(3 P) atoms. We find that transitions originating in the C 1Π g , d 3Π g , and 1 5Π u states are the main contributors to the process. The results are compared and contrasted with previous results obtained from a semiclassical approximation. New ab initio potential curves and transition dipole moment functions have been obtained for the present work using the multi-reference configuration interaction approach with the Davidson correction (MRCI+Q) and aug-cc-pCV5Z basis sets, substantially increasing the available molecular data on dicarbon. Applications of the current computations to various astrophysical environments and laboratory studies are briefly discussed, focusing on these rates.
Radiative Association of Atomic and Ionic CarbonBabb, James F.Smyth, Ryan T.McLaughlin, Brendan M.DOI: info:10.3847/1538-4357/ab43cbv. 884155
Babb, James F., Smyth, Ryan T., and McLaughlin, Brendan M. 2019. "Radiative Association of Atomic and Ionic Carbon." The Astrophysical Journal 884:155. https://doi.org/10.3847/1538-4357/ab43cb
ID: 154636
Type: article
Authors: Babb, James F.; Smyth, Ryan T.; McLaughlin, Brendan M.
Abstract: We present calculated cross sections and rate coefficients for the formation of the dicarbon cation ({{{C}}}2+) by the radiative association process in collisions of a {{C}}{(}3P) atom and a {{{C}}}+{(}2{P}o) ion. Molecular structure calculations for a number of low-lying doublet and quartet states of {{{C}}}2+ are used to obtain the potential energy surfaces and transition dipole moments coupling the states of interest, substantially increasing the available molecular data for {{{C}}}2+. Using a quantum-mechanical method, we explore a number of allowed transitions and determine those contributing to the radiative association process. The calculations extend the available data for this process down to the temperature of 100 K, where the rate coefficient is found to be about 2× {10}-18 {cm}}3 {{{s}}}-1. We provide analytical fits suitable for incorporation into astrochemical reaction databases.
Theory and simulation of spectral line broadening by exoplanetary atmospheric hazeFelfli, Z.Karman, TijsKharchenko, VasiliVrinceanu, D.Babb, James F.Sadeghpour, Hossein R.DOI: info:10.1093/mnras/sty2694v. 4821330–1337
Felfli, Z., Karman, Tijs, Kharchenko, Vasili, Vrinceanu, D., Babb, James F., and Sadeghpour, Hossein R. 2019. "Theory and simulation of spectral line broadening by exoplanetary atmospheric haze." Monthly Notices of the Royal Astronomical Society 482:1330– 1337. https://doi.org/10.1093/mnras/sty2694
ID: 150447
Type: article
Authors: Felfli, Z.; Karman, Tijs; Kharchenko, Vasili; Vrinceanu, D.; Babb, James F.; Sadeghpour, Hossein R.
Abstract: Atmospheric haze is a leading candidate for opacity and lack of prominent features in expolanetary spectra, as well as in the atmospheres of Solar system planets, satellites, and comets. Exoplanetary transmission spectra, which carry information about how the planetary atmospheres become opaque to stellar light in transit, often show broad absorption in the region of wavelengths corresponding to spectral lines of sodium, potassium, and water. We develop a detailed atomistic model, describing interactions of atomic or molecular radiators with dust and atmospheric haze particulates. This model incorporates a realistic structure of haze particulates from small nano-sized seed particles up to submicron irregularly shaped aggregates and accounting for both pairwise collisions between the radiator and haze perturbers, and quasi-static mean-field shift of atomic levels in haze environments. This formalism can explain large flattening of absorption and emission spectra in hazy atmospheres and shows how the radiator - haze particle interaction affects the absorption spectral shape in the wings of spectral lines and near their centres. The theory can, in principle, account for nearly all realistic structure, density, size, and chemical composition of haze particulates. We illustrate the utility of the method by computing shift and broadening of the emission spectra of the Na I D lines in haze environment, formed by Ar nano-clusters. Argon is used as the illustrative haze constituent only because of the simplicity of closed-shell atoms and their clusters for quantum mechanical calculations of interaction between radiator and nano-sized haze particles. The elegance and generality of the proposed model should make it amenable to a broad community of users in astrophysics and chemistry.
Transition Rates for 3s3p2 4P-3s3p4s 4Po Transitions in Al iFroese Fischer, CharlotteBabb, James F.DOI: info:10.3390/atoms7020054v. 754
Froese Fischer, Charlotte and Babb, James F. 2019. "Transition Rates for 3s3p2 4P-3s3p4s 4Po Transitions in Al i." Atoms 7:54. https://doi.org/10.3390/atoms7020054
ID: 152884
Type: article
Authors: Froese Fischer, Charlotte; Babb, James F.
Abstract: Fully relativistic calculations have been performed for two multiplets, $3s3p^2\;^4P$ and $3s3p4s\;^4P^o$, in Al I. Wave functions were obtained for all levels of these multiplets using the GRASP programs. Reported are the E1 transitions rates for all transitions between levels of these multiplets. Transition energies and transition rates are compared with observed values and other theory. Our calculated transition rates are smaller by about 10% than observed rates, reducing a large discrepancy between earlier calculations and experiment.
Single photoionization of the Kr-like Rb II ion in the photon energy range 22-46.0 eVMcLaughlin, Brendan M.Babb, James F.DOI: info:10.1093/mnras/stz790v. 486245–250
McLaughlin, Brendan M. and Babb, James F. 2019. "Single photoionization of the Kr-like Rb II ion in the photon energy range 22-46.0 eV." Monthly Notices of the Royal Astronomical Society 486:245– 250. https://doi.org/10.1093/mnras/stz790
ID: 152890
Type: article
Authors: McLaughlin, Brendan M.; Babb, James F.
Abstract: Single photoionization cross-sections for Kr-like Rb+ ions are reported in the energy (wavelength) range from 22 (564 Å) to 46 eV (270 Å). Theoretical cross-section calculations for this trans-Fe element are compared with measurements from the ASTRID radiation facility in Aarhus, Denmark and from the dual laser plasma technique, at respectively 40 and 35 meV FWHM energy resolution. In the photon energy region 22-32 eV the spectrum is dominated by excitation auto-ionizing resonance states. Above 32 eV the cross-section exhibits classic Fano window resonances features, which are analysed and discussed. Large-scale theoretical photoionization cross-section calculations, performed using a Dirac Coulomb R-matrix approximation are benchmarked against these high-resolution experimental results. Comparison of the theoretical work with the experimental studies allowed the identification of resonance features and their parameters in the spectra in addition to contributions from excited metastable states of the Rb+ ions.
Rate constants for the formation of CS by radiative associationForrey, R. C.Babb, J. F.Stancil, P. C.McLaughlin, B. M.DOI: info:10.1093/mnras/sty1739v. 4794727–4734
Forrey, R. C., Babb, J. F., Stancil, P. C., and McLaughlin, B. M. 2018. "Rate constants for the formation of CS by radiative association." Monthly Notices of the Royal Astronomical Society 479:4727– 4734. https://doi.org/10.1093/mnras/sty1739
ID: 149372
Type: article
Authors: Forrey, R. C.; Babb, J. F.; Stancil, P. C.; McLaughlin, B. M.
Abstract: Rate constants for the formation of carbon monosulfide (CS) by radiative association are calculated using accurate molecular data. The rate constants include both direct and indirect formation processes. The indirect processes (inverse rotational and electronic predissociation) are evaluated for conditions of local thermodynamic equilibrium (LTE) and also in the non-LTE limit of zero radiation temperature and atomic density. Phenomenological rate constants for CS formation in realistic astrophysical environments are expected to lie in-between these limiting cases. An analytic formula is used to fit the rate constants for convenient use in astrophysical models. The impact of the results on various astrophysical environments is briefly discussed.
Calculations of long-range three-body interactions for He(n0lambdaS )-He(n0lambdaS )-He(n0'lambdaL )Yan, Pei-GenTang, Li-YanYan, Zong-ChaoBabb, James F.DOI: info:10.1103/PhysRevA.97.042710v. 97042710
Yan, Pei-Gen, Tang, Li-Yan, Yan, Zong-Chao, and Babb, James F. 2018. "Calculations of long-range three-body interactions for He(n0lambdaS )-He(n0lambdaS )-He(n0'lambdaL )." Physical Review A 97:042710. https://doi.org/10.1103/PhysRevA.97.042710
ID: 147038
Type: article
Authors: Yan, Pei-Gen; Tang, Li-Yan; Yan, Zong-Chao; Babb, James F.
Abstract: We theoretically investigate long-range interactions between an excited L -state He atom and two identical S -state He atoms for the cases of the three atoms all in spin-singlet states or all in spin-triplet states, denoted by He(n0lambdaS )-He(n0lambdaS )-He(n0'lambdaL ), with n0 and n0' principal quantum numbers, lambda =1 or 3 the spin multiplicity, and L the orbital angular momentum of a He atom. Using degenerate perturbation theory for the energies up to second-order, we evaluate the coefficients C3 of the first-order dipolar interactions and the coefficients C6 and C8 of the second-order additive and nonadditive interactions. Both the dipolar and dispersion interaction coefficients, for these three-body degenerate systems, show dependences on the geometrical configurations of the three atoms. The nonadditive interactions start to appear in second-order. To demonstrate the results and for applications, the obtained coefficients Cn are evaluated with highly accurate variationally generated nonrelativistic wave functions in Hylleraas coordinates for He(1 1S ) -He(1 1S ) -He(2 1S ) , He(1 1S ) -He(1 1S ) -He(2 1P ) , He(2 1S ) -He(2 1S ) -He(2 1P ) , and He(2 3S ) -He(2 3S ) -He(2 3P ) . The calculations are given for three like nuclei for the cases of hypothetical infinite mass He nuclei, and of real finite mass 4He or 3He nuclei. The special cases of the three atoms in equilateral triangle configurations are explored in detail, and for the cases in which one of the atoms is in a P state, we also present results for the atoms in an isosceles right triangle configuration or in an equally spaced collinear configuration. The results can be applied to construct potential energy surfaces for three helium atom systems.
Special issue on the atomic and molecular processes in the ultracold regime, the chemical regime and astrophysicsBabb, James F.Côté, RobinSadeghpour, Hossein R.Stancil, Phillip C.DOI: info:10.1088/1361-6455/aa779bv. 50140202
Babb, James F., Côté, Robin, Sadeghpour, Hossein R., and Stancil, Phillip C. 2017. "Special issue on the atomic and molecular processes in the ultracold regime, the chemical regime and astrophysics." Journal of Physics B Atomic Molecular Physics 50:140202. https://doi.org/10.1088/1361-6455/aa779b
ID: 143794
Type: article
Authors: Babb, James F.; Côté, Robin; Sadeghpour, Hossein R.; Stancil, Phillip C.
Abstract: This editorial introduces the J. Phys. B: Atomic, Molecular and Optical Physics Special Issue "Atomic and Molecular Processes in the Ultracold Regime, the Chemical Regime and Astrophysics" dedicated to Professor Alexander Dalgarno (1928-2015). After a brief biographical review, short summaries of the contributed papers and their relations to some of Prof. Dalgarno's work are given.
Radiative charge transfer in collisions of C with He+Babb, James F.McLaughlin, B. M.DOI: info:10.1088/1361-6455/aa54f4v. 50044003
Babb, James F. and McLaughlin, B. M. 2017. "Radiative charge transfer in collisions of C with He+." Journal of Physics B Atomic Molecular Physics 50:044003. https://doi.org/10.1088/1361-6455/aa54f4
ID: 142785
Type: article
Authors: Babb, James F.; McLaughlin, B. M.
Abstract: Radiative charge exchange collisions between a carbon atom {{C}}({}3P) and a helium ion {{He}}+({}2S), both in their ground state, are investigated theoretically. Detailed quantum chemistry calculations are carried out to obtain potential energy curves and transition dipole matrix elements for doublet and quartet molecular states of the HeC+ cation. Radiative charge transfer cross sections and rate coefficients are calculated and are found at thermal and lower energies to be large compared to those for direct charge transfer. The present results might be applicable to modelling the complex interplay of [{{C}} {{II}}] (or {{{C}}}+), {{C}}, and {CO} at the boundaries of interstellar photon dominated regions and in x-ray dominated regions, where the abundance of {{He}}+ affects the abundance of {CO}.
Radiative association of C(3P) and H+: triplet statesBabb, James F.McLaughlin, Brendan M.DOI: info:10.1093/mnras/stx630v. 4682052–2057
Babb, James F. and McLaughlin, Brendan M. 2017. "Radiative association of C(3P) and H+: triplet states." Monthly Notices of the Royal Astronomical Society 468:2052– 2057. https://doi.org/10.1093/mnras/stx630
ID: 143346
Type: article
Authors: Babb, James F.; McLaughlin, Brendan M.
Abstract: The radiative association of C(3P) and H+ is investigated by calculating cross-sections for photon emission into bound ro-vibrational states of CH+ from the vibrational continua of initial triplet d 3Π or b 3Σ- states. Potential energy curves and transition dipole moments are calculated using multireference configuration interaction (MRCI) methods with AV6Z basis sets. The cross-sections are evaluated using quantum-mechanical methods and rate coefficients are calculated. The rate coefficients are about 100 times larger than those for radiative association of C+(2Po) and H from the A 1Π state. We also confirm that the formation of CH+ by radiative association of C+(2Po) and H via the triplet c 3Σ+ state is a minor process.
Rate constants for the formation of SiO by radiative associationCairnie, M.Forrey, R. C.Babb, J. F.Stancil, P. C.McLaughlin, B. M.DOI: info:10.1093/mnras/stx1715v. 4712481–2490
Cairnie, M., Forrey, R. C., Babb, J. F., Stancil, P. C., and McLaughlin, B. M. 2017. "Rate constants for the formation of SiO by radiative association." Monthly Notices of the Royal Astronomical Society 471:2481– 2490. https://doi.org/10.1093/mnras/stx1715
ID: 144742
Type: article
Authors: Cairnie, M.; Forrey, R. C.; Babb, J. F.; Stancil, P. C.; McLaughlin, B. M.
Abstract: Accurate molecular data for the low-lying states of SiO are computed and used to calculate rate constants for radiative association (RA) of Si and O. Einstein A-coefficients are also calculated for transitions between all of the bound and quasi-bound levels for each molecular state. The radiative widths are used together with elastic tunnelling widths to define effective RA rate constants which include both direct and indirect (inverse pre-dissociation) formation processes. The indirect process is evaluated for two kinetic models which represent limiting cases for astrophysical environments. The first case scenario assumes an equilibrium distribution of quasi-bound states and would be applicable whenever collisional and/or radiative excitation mechanisms are able to maintain the population. The second case scenario assumes that no excitation mechanisms are available which corresponds to the limit of zero radiation temperature and zero atomic density. Rate constants for SiO formation in realistic astrophysical environments would presumably lie between these two limiting cases.
Feasibility of an optical fiber clockIlinova, EkaterinaBabb, James F.Derevianko, AndreiDOI: info:10.1103/PhysRevA.96.033814v. 96033814
Ilinova, Ekaterina, Babb, James F., and Derevianko, Andrei. 2017. "Feasibility of an optical fiber clock." Physical Review A 96:033814. https://doi.org/10.1103/PhysRevA.96.033814
ID: 144692
Type: article
Authors: Ilinova, Ekaterina; Babb, James F.; Derevianko, Andrei
Abstract: We explore the feasibility of a fiber clock, i.e., a compact, high-precision, optical lattice atomic clock based on atoms trapped inside a hollow-core optical fiber. Such a setup offers an intriguing potential both for a substantially increased number of interrogated atoms (and thereby an improved clock stability) and for miniaturization. We evaluate the sensitivity of the 1S0-3P0 clock transition in Hg and other divalent atoms to the fiber inner core surface at nonzero temperatures. The Casimir-Polder interaction induced 1S0-3P0 transition frequency shift is calculated for the atom inside the hollow capillary as a function of atomic position, capillary material, and geometric parameters. For Hg atoms on the axis of a silica capillary with inner radius ≥15 μ m and optimally chosen thickness d ˜1 μ m , the atom-surface interaction induced 1S0-3P0 clock transition frequency shift can be kept on the level δ ν /νHg˜10-19 . We also estimate the atom loss and heating due to collisions with the buffer gas, lattice intensity noise induced heating, spontaneous photon scattering heating, and residual birefringence induced frequency shifts.
Formation of silicon monoxide by radiative association: the impact of resonancesForrey, Robert C.Babb, James F.Stancil, Phillip C.McLaughlin, Brendan M.DOI: info:10.1088/0953-4075/49/18/184002v. 49184002
Forrey, Robert C., Babb, James F., Stancil, Phillip C., and McLaughlin, Brendan M. 2016. "Formation of silicon monoxide by radiative association: the impact of resonances." Journal of Physics B Atomic Molecular Physics 49:184002. https://doi.org/10.1088/0953-4075/49/18/184002
ID: 140772
Type: article
Authors: Forrey, Robert C.; Babb, James F.; Stancil, Phillip C.; McLaughlin, Brendan M.
Abstract: Detailed quantum chemistry calculations within the multireference configuration interaction approximation with the Davidson correction are presented using an aug-cc-pV6Z basis set, for the potential energy curves and transition dipole moments between low lying molecular states of singlet spin symmetry for the SiO molecule. The high quality molecular data are used to obtain radiative association cross sections and rate coefficients for collisions between ground state Si and O atoms. Quantal calculations are compared with semiclassical results. Using a quantum kinetic theory of radiative association in which quasibound levels are assumed to be in local thermodynamic equilibrium, we find that resonances play an important role in enhancing the rate coefficients at low temperatures by several orders of magnitude from that predicted by standard quantum scattering formulations. These new molecular formation rates may have important implications for applications in astrophysics.
Calculations of long-range three-body interactions for Li (2 2S)-Li (2 2S)-Li (2 2P)Yan, Pei-GenTang, Li-YanYan, Zong-ChaoBabb, James F.DOI: info:10.1103/PhysRevA.94.022705v. 94022705
Yan, Pei-Gen, Tang, Li-Yan, Yan, Zong-Chao, and Babb, James F. 2016. "Calculations of long-range three-body interactions for Li (2 2S)-Li (2 2S)-Li (2 2P)." Physical Review A 94:022705. https://doi.org/10.1103/PhysRevA.94.022705
ID: 140725
Type: article
Authors: Yan, Pei-Gen; Tang, Li-Yan; Yan, Zong-Chao; Babb, James F.
Abstract: General formulas for calculating the several leading long-range interactions among three identical atoms where two atoms are in identical S states and the other atom is in a P state are obtained using perturbation theory for the energies up to second order. The first-order (dipolar) interactions depend on the geometrical configurations of the three atoms. In second order, additive and nonadditive dispersion interactions are obtained. The nonadditive interactions depend on the geometrical configurations in marked contrast to the case where all three atoms are in identical S states, for which the nonadditive (also known as triple-dipole or as Axilrod-Muto-Teller) dispersion interactions appear at the third order. The formalism is demonstrated by the calculation of the coefficients for the Li (2 2S)-Li (2 2S)-Li (2 2P) system using variationally generated atomic lithium wave functions in Hylleraas coordinates. The present dipolar coefficients and additive and nonadditive dispersion coefficients may be useful in constructing precise potential energy surfaces for this three lithium atom system.
State Resolved Data for Radiative Association of H and H+ and for Photodissociation of H_2^+Babb, James F.DOI: info:10.1088/0067-0049/216/1/21v. 21621
Babb, James F. 2015. "State Resolved Data for Radiative Association of H and H+ and for Photodissociation of H_2^+." The Astrophysical Journal Supplement Series 216:21. https://doi.org/10.1088/0067-0049/216/1/21
ID: 134205
Type: article
Authors: Babb, James F.
Abstract: The matrix elements and energies needed to calculate vibrational-rotational state resolved cross sections and rate coefficients for radiative association of H and H+ and for photodissociation of H_2^+ are presented for applications to simulations of chemistry in the early universe and to stellar atmospheres.
Alexander DalgarnoBabb, James F.Sadeghpour, HosseinKirby, KateDOI: info:10.1063/PT.3.2889v. 6863–63
Babb, James F., Sadeghpour, Hossein, and Kirby, Kate. 2015. "Alexander Dalgarno." Physics Today 68:63– 63. https://doi.org/10.1063/PT.3.2889
ID: 137286
Type: article
Authors: Babb, James F.; Sadeghpour, Hossein; Kirby, Kate
Abstract: Not Available
Long-range interactions of excited He atoms with the alkaline earth atoms Mg, Ca, and SrZhang, J. -YMitroy, J.Yan, Z. -CBabb, J. F.Sadeghpour, H. R.Schwingenschlögl, U.DOI: info:10.1063/1.4794048v. 1384317
Zhang, J. -Y, Mitroy, J., Yan, Z. -C, Babb, J. F., Sadeghpour, H. R., and Schwingenschlögl, U. 2013. "Long-range interactions of excited He atoms with the alkaline earth atoms Mg, Ca, and Sr." Journal of Chemical Physics 138:4317. https://doi.org/10.1063/1.4794048
ID: 115630
Type: article
Authors: Zhang, J. -Y; Mitroy, J.; Yan, Z. -C; Babb, J. F.; Sadeghpour, H. R.; Schwingenschlögl, U.
Abstract: Dispersion coefficients for the long-range interactions of the first four excited states of He, i.e., He(2 1, 3S) and He(2 1, 3P), with the low-lying states of the alkaline earth atoms Mg, Ca, and Sr are calculated by summing over the reduced matrix elements of multipole transition operators.
Electric dipole polarizabilities at imaginary frequencies for hydrogen, the alkali-metal, alkaline- earth, and noble gas atomsDerevianko, AndreiPorsev, Sergey G.Babb, James F.DOI: info:10.1016/j.adt.2009.12.002v. 96323–331
Derevianko, Andrei, Porsev, Sergey G., and Babb, James F. 2010. "Electric dipole polarizabilities at imaginary frequencies for hydrogen, the alkali-metal, alkaline- earth, and noble gas atoms." Atomic Data and Nuclear Data Tables 96:323– 331. https://doi.org/10.1016/j.adt.2009.12.002
ID: 88003
Type: article
Authors: Derevianko, Andrei; Porsev, Sergey G.; Babb, James F.
Abstract: The electric dipole polarizabilities evaluated at imaginary frequencies for hydrogen, the alkali-metal atoms, the alkaline-earth atoms, and the noble gases are tabulated along with the resulting values