J/A+A/610/A57 Inelastic O+H collision data (Barklem, 2018)
Excitation and charge transfer in low-energy hydrogen atom collisions with
neutral oxygen.
Barklem P.S.
<Astron. Astrophys. 610, A57 (2018)>
=2018A&A...610A..57B 2018A&A...610A..57B (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - line: profiles
Abstract:
Excitation and charge transfer in low-energy O+H collisions is
studied; it is a problem of importance for modelling stellar spectra
and obtaining accurate oxygen abundances in late-type stars including
the Sun. The collisions have been studied theoretically using a
previously presented method based on an asymptotic two-electron linear
combination of atomic orbitals (LCAO) model of ionic-covalent
interactions in the neutral atom-hydrogen-atom system, together with
the multichannel Landau-Zener model. The method has been extended to
include configurations involving excited states of hydrogen using an
estimate for the two-electron transition coupling, but this extension
was found to not lead to any remarkably high rates. Rate coefficients
are calculated for temperatures in the range 1000-20000K, and
charge transfer and (de)excitation processes involving the first
excited S-states, 4s.5So and 4s.3So, are found to have the
highest rates.
Description:
The file states.dat lists the considered states. The remaining files
then provide the rate coefficients and "fluctuations".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
states.dat 27 21 States and their energies
list.dat 97 60 List of files in subdirectory files
files/* . 60 Individual rate coefficients files
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See also:
J/A+A/572/A103 : Inelastic silicon-hydrogen collision data (Belyaev+, 2014)
J/A+A/606/A11 : Inelastic e+Mg collision data (Barklem+, 2017)
Byte-by-byte Description of file: states.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Index [1/21] Index
4- 15 A12 --- Label Term label
16- 27 F12.3 cm-1 E Term energy in 1/cm
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- FileName Name of the file in subdirectory files
15- 97 A83 --- Title Title of the file
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Byte-by-byte Description of file: files/*
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Bytes Format Units Label Explanations
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2- 13 E12.4 cm+3/s Ratec1 Rate coefficient for index = 1 (1)
15- 26 E12.4 cm+3/s Ratec2 Rate coefficient for index = 2 (1)
28- 39 E12.4 cm+3/s Ratec3 Rate coefficient for index = 3 (1)
41- 52 E12.4 cm+3/s Ratec4 Rate coefficient for index = 4 (1)
54- 65 E12.4 cm+3/s Ratec5 Rate coefficient for index = 5 (1)
67- 78 E12.4 cm+3/s Ratec6 Rate coefficient for index = 6 (1)
80- 91 E12.4 cm+3/s Ratec7 Rate coefficient for index = 7 (1)
93-104 E12.4 cm+3/s Ratec8 Rate coefficient for index = 8 (1)
106-117 E12.4 cm+3/s Ratec9 Rate coefficient for index = 9 (1)
119-130 E12.4 cm+3/s Ratec10 Rate coefficient for index = 10 (1)
132-143 E12.4 cm+3/s Ratec11 Rate coefficient for index = 11 (1)
145-156 E12.4 cm+3/s Ratec12 Rate coefficient for index = 12 (1)
158-169 E12.4 cm+3/s Ratec13 Rate coefficient for index = 13 (1)
171-182 E12.4 cm+3/s Ratec14 Rate coefficient for index = 14 (1)
184-195 E12.4 cm+3/s Ratec15 Rate coefficient for index = 15 (1)
197-208 E12.4 cm+3/s Ratec16 Rate coefficient for index = 16 (1)
210-221 E12.4 cm+3/s Ratec17 Rate coefficient for index = 17 (1)
223-234 E12.4 cm+3/s Ratec18 Rate coefficient for index = 18 (1)
236-247 E12.4 cm+3/s Ratec19 Rate coefficient for index = 19 (1)
249-260 E12.4 cm+3/s Ratec20 Rate coefficient for index = 20 (1)
262-273 E12.4 cm+3/s Ratec21 Rate coefficient for index = 21 (1)
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Note (1): The files are in the form
(row,column) = (final state, initial state),
as defined by the labels in states.dat.
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Acknowledgements:
Paul Barklem, paul.barklem(at)physics.uu.se
(End) Paul Barklem [Uppsala Univ., Sweden], Patricia Vannier [CDS] 05-Dec-2017