James F. Babb

Collisions (cooling, diagnostics)

Fine-structure transitions of Ne+, Ar+, Ne2+, and Ar2+ induced by collisions with atomic hydrogen, Pei-Gen Yan and James F. Babb, Astrophys. J., 961 (2024), 43. Collisional relaxation data available in LAMDA format at Figshare.

Evidence for dust depletion in a misaligned protoplanetary disk with JWST, C. C. Espaillat et al., Astrophys. J. Lett., 973 (2024), L16. You can read the preprint.

PDRs4All. IX. Sulfur elemental abundance in the Orion Bar, A. Fuente et al., Astron. Astrophys., 687 (2024), A87. You can read the preprint.

Fine-structure transitions of Si and S induced by collisions with atomic hydrogen, Pei-Gen Yan and James F. Babb, MNRAS, 522 (2023), 1265. Collisional relaxation data available in LAMDA format at Figshare. You can read the preprint.

Fine-structure transitions of the carbon isoelectronic sequence C, N+, and O2+ induced by collisions with atomic hydrogen, Pei-Gen Yan and James F. Babb, MNRAS, 518 (2023), 6004. Collisional relaxation data available in LAMDA format at Figshare. You can read the preprint.

Fine-structure excitation of O(3P) induced by collisions with atomic hydrogen, Pei-Gen Yan and James F. Babb, Res. Notes AAS, 6 (2022), 145.

For the molecular Universe

Comprehensive chemistry of HeH+ in the early Universe, E. D. S. Courtney, R. C. Forrey, R. T. McArdle, P. C. Stancil, and J. F. Babb, Astrophys. J., 919 (2021), 70.

Revisiting the formation of HeH+ in the planetary nebula NGC 7027, R. C. Forrey, J. F. Babb, E. Courtney, R. McArdle, and P. C. Stancil, Astrophys. J., 898 (2020), 86. You can read the preprint.

Radiative association of atomic and ionic carbon, James F. Babb, R. T. Smyth, and B. M. McLaughlin, Astrophys. J., 884 (2019), 155. You can read the preprint.

Dicarbon formation in collisions of two carbon atoms, James F. Babb, R. T. Smyth, and B. M. McLaughlin, Astrophys. J., 876 (2019), 38. You can read the preprint.


UV transitions in aluminum

Transition rates for 3s3p24P - 3s3p4s 4Po transitions in Al ɪ, Charlotte Froese Fischer and James F. Babb, Atoms, 7 (2019), 54. You can read the preprint.


Spectroscopy for planetary nebulae

Single photoionization of the Kr-like Rb II ion in the photon energy range 22 - 46.0 eV, Brendan M. McLaughlin and James F. Babb, MNRAS, 486 (2019), 245. You can read the preprint abstract (this link also contains links to get the entire preprint).

Photoionization of Rb2+ ions in the valence energy region 37 eV - 44 eV, Brendan M. McLaughlin and James F. Babb, J. Phys. B: At. Mol. Opt. Phys., 52 (2019), 125201. You can read the preprint abstract (this link also contains links to get the entire preprint).


White paper

Perspectives on Astrophysics Based on Atomic, Molecular, and Optical (AMO) Techniques, Daniel Wolf Savin, James F. Babb, Paul M. Bellan, Crystal Brogan, Jan Cami, Paola Caselli, Lia Corrales, Gerardo Dominguez, Steven R. Federman, Chris J. Fontes, Richard Freedman, Brad Gibson, Leon Golub, Thomas W. Gorczyca, Michael Hahn, Sarah M. Hörst, Reggie L. Hudson, Jeffrey Kuhn, James E. Lawler, Maurice A. Leutenegger, Joan P. Marler, Michael C. McCarthy, Brett A. McGuire, Stefanie N. Milam, Nicholas A. Murphy, Gillian Nave, Aimee A. Norton, Anthony Papol, John C. Raymond, Farid Salama, Ella M. Sciamma-O'Brien, Randall Smith, Chad Sosolik, Clara Sousa-Silva, Phillip C. Stancil, Frank Timmes, Virginia L. Trimble, and Bradford J. Wargelin (2018), Submitted to the Committee on Atomic, Molecular, and Optical Science (a/k/a "CAMOS"), Board on Physics and Astronomy, Division on Engineering and Physical Sciences, National Academy of Sciences, Engineering and Medicine for the Decadal Assessment on Atomic, Molecular, and Optical Science (a/k/a "AMO 2020"). You can read the preprint abstract (this link also contains links to get the entire preprint).


Crab nebula

Radiative charge transfer between the helium ion and argon, James F. Babb and Brendan M. McLaughlin, Astrophys. J. 860 (2018), 151. You can read the preprint abstract (this link also contains links to get the entire preprint).


Interstellar chemistry

Photodissociation of CS from excited rovibrational levels, R. Pattillo, R. Cieszewski, Phillip Stancil, Robert Forrey, James Babb, J. McCann, and Brendan McLaughlin, Astrophys. J. 858 (2018), 10. You can read the preprint abstract (this link also contains links to get the entire preprint).


xray dominated regions, Type II supernovae ejecta, ...

Radiative association of C with H+: Triplet states, James F. Babb and B. M. McLaughlin, MNRAS 468 (2017), 2052. You can read the preprint abstract (this link also contains links to get the entire preprint).

Radiative charge transfer in collisions of C with He+, James F. Babb and B. M. McLaughlin, J. Phys. B: At. Mol. Opt. Phys. 50 (2017), 044003. You can read the preprint abstract (this link also contains links to get the entire preprint).


Exoplanet HD 209458b; interstellar abundances

An empirically constructed dynamic electric dipole polarizability function of magnesium and its applications, James F. Babb, Phys. Rev. A 92 (2015), 022712. You can read the preprint abstract (this link also contains links to get the entire preprint). Nb. The conclusion that I reached in this paper about the value of the principal resonance line oscillator strength for Mg is evidently confirmed (independently) by Cashman et al., ApJS 230 (2017), 8 and by Rhodin et al., Astr. and Astroph. (A&A) 598 (2017), A102.


For modeling the pregalactic Universe's primordial gas to help answer "How did the galaxies form and evolve from the Big Bang?"

State resolved data for radiative association of H and H+ and for photodissociation of H2+, James F. Babb, ApJS, vol. 216 (2015), 21; vol. 237 (2018), 20 (erratum). You can read the preprint abstract (this link also contains links to get the entire preprint).

Rate Coefficients for Ro-vibrational Transitions in H2 Due to Collisions with He, N. Balakrishnan, M. Vieira, J. F. Babb, A. Dalgarno, R. C. Forrey, S. Lepp, Astrophys. J., vol. 524 (1999), 1122. Rate coefficient data is available in machine readable tables at Figshare, see v=2 para, v=2 ortho, v=3 para, v=3 ortho, v=4 para, v=4 ortho.

Molecule formation in dust-poor environments, J. F. Babb and K. P. Kirby, in "The molecular astrophysics of stars and galaxies-A volume honouring Alexander Dalgarno", T. W. Hartquist and D. A. Williams, eds., Oxford University Press, Oxford, 1998, pp. 11-34.
This is a topical review.

For solar and stellar physics and and models of chemistry in the winds of young stellar objects.

Photodissociation cross sections for the hydrogen molecular ion, see Figshare project (2014). (also related to pregalactic modeling above).


For supernovae (ejecta).

Rate constants for the formation of CS by radiative association, R. C. Forrey, J. F. Babb, P. C. Stancil, and B. M. McLaughlin, Mon. Not. Roy. Astron. Soc. 479 (2018), 4727-4734. Read the accepted version at this link.

Rate constants for the formation of SiO by radiative association, M. Cairnie, R. C. Forrey, J. F. Babb, P. C. Stancil, and B. M. McLaughlin, Mon. Not. Roy. Astron. Soc. 471 (2017), 2481-2490. You can read the preprint abstract (this link also contains links to get the entire preprint).

Formation of silicon monoxide by radiative association: the impact of resonances, R. C. Forrey, J. F. Babb, P. C. Stancil, B. M. McLaughlin, J. Phys. B: At. Mol. Opt. Phys. 49 (2016) 184002. You can read the preprint abstract (this link also contains links to get the entire preprint).

Radiative association and inverse predissociation of oxygen atoms, Physical Review A, vol. 51 (1995) 3021-3026. You can read the preprint abstract (this link also contains links to get the entire preprint).
The results of this study have been used in a model of the formation and destruction of silicon monoxide in a supernova, SN 1987A, see: Weihong Liu and A. Dalgarno, Astrophysical J., vol. 471 (1996), pp. 480-484 and (or?) Rob A. Gearhart, J. Craig Wheeler, and Douglas A. Swartz, Astrophysical J., vol. 510 (1999), pp. 944-966.

and also (applications to hot oxygen-containing gas mixtures) The radiative association of O and O+ , J. F. Babb, Zhuang Fan, and A. Dalgarno, J. Quant. Spect. Rad. Transfer, vol. 52 (1994), pp. 161-166

Related to the spectroscopy of brown dwarf atmospheres.

Absorption spectrum in the wings of the potassium second resonance doublet broadened by helium, F. Shindo, J. F. Babb, K. Kirby, and K. Yoshino, J. Phys. B 40, 2841 (2007). Read the preprint abstract (this link also contains links to get the entire preprint.)

Theoretical study of sodium and potassium resonance lines pressure broadened by helium atoms, Cheng Zhu, James F. Babb, and Alex Dalgarno, Phys. Rev. A, 73 (2006), 012506. Read the preprint abstract (this link also contains links to get the entire preprint.)

Theoretical study of pressure broadening of lithium resonance lines by helium atoms, Cheng Zhu, James F. Babb, and Alex Dalgarno, Phys. Rev. A, 71 (2005), 052710. Read the preprint abstract (this link also contains links to get the entire preprint.)

and related studies,

Theoretical study of the absorption spectra of the sodium dimer, H.-K. Chung, K. Kirby, and J.F. Babb. Phys. Rev. A, 63 (2001), 32516. Read the preprint abstract (this link also contains links to get the entire preprint.) Text file approximation to the preprint. Utilizing improved data for the sodium dimer from photoassociation spectroscopy, Feshbach resonance studies, and ultracold atomic collisions, as well as other data, we calculated the absorption coefficients for light in hot sodium vapors.

Theoretical and experimental studies of sodium-xenon absorption spectra and applications to lighting, J.F. Babb, H.-K. Chung, M. Shurgalin, K. Yoshino, K. Kirby, and W. Parkinson, in ``Atomic Processes in Plasmas: Twelfth Topical Conference,'' R. C. Mancini and R. A. Phaneuf, eds., AIP Press, New York, 2000, pp. 190-200.

Theoretical study of the absorption spectra of the lithium dimer, H.-K. Chung, K. Kirby, and J. F. Babb, Phys. Rev. A 60 (1999), pp. 2002-2008. Read the preprint abstract (this link also contains links to get the entire preprint.) Text file approximation to the preprint.

See also:

Continuum absorption of vibrationally excited O2 from 200-320 nm, J. F. Babb, Y. Sun, M. J. Jamieson, A. Dalgarno, and A. C. Allison, J. Quant. Spect. Rad. Transfer, vol. 50 (1993), pp. 579-583; Correction, ibid., vol. 51 (1994) p. 787, Errata

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