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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: list.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- FileName Name of the file in subdirectory files 15- 97 A83 --- Title Title of the file -------------------------------------------------------------------------------- Byte-by-byte Description of file: files/* -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Note (1): The files are in the form (row,column) = (final state, initial state), as defined by the labels in states.dat. -------------------------------------------------------------------------------- Acknowledgements: Paul Barklem, paul.barklem(at)physics.uu.se
(End) Paul Barklem [Uppsala Univ., Sweden], Patricia Vannier [CDS] 05-Dec-2017
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