J/MNRAS/504/1531 Rotational Excitation Rates of HCO+ (Singh, 2021)
Electron-impact rotational excitation cross-sections and
rate coefficients of molecular ion: HCO^+.
Singh J.
<Mon. Not. R. Astron. Soc. 504, 1531-1535 (2021)>
=2021MNRAS.504.1531S 2021MNRAS.504.1531S (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: rotational excitation - scattering -
planets and satellites: atmospheres - ISM: clouds - ISM: molecules
Abstract:
HCO+ is one of the most abundant polyatomic ion in the Universe,
also its presence in the planetary atmospheres and interstellar medium
(ISM) makes it an interesting case to study. Low energy e−-HCO+
collisions result in rotational excitation and other molecular
processes. In this study, the cross-sections for rotational
transitions in HCO+ are evaluated for four rotational levels (j = 0,
1, 2, and 3) using the UK R-matrix method and the multichannel quantum
defect theory (MQDT). The UK R-matrix method used to generate
scattering matrices, through which cross-sections are computed. In
past two decades, after developments and implementations of different
theoretical approaches, the improved channel elimination procedure
applied here is more promising to evaluate more accurate results near
rotational thresholds important for the analysis of intensities of
microwave region in plasma modelling. The rate coefficients are
deduced from the computed cross-sections and studied over a wide
electron temperature range.
Description:
Excitation and de-excitation rate coefficients are provided for the
first four rotational levels (j=0,1,2,3) of HCO+ in collisions with
electrons for temperatures between 1K and 100000K.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 30 100000 Rate coefficients for transition j=0 to j=1
table2.dat 30 100000 Rate coefficients for transition j=1 to j=0
table3.dat 30 100000 Rate coefficients for transition j=0 to j=2
table4.dat 30 100000 Rate coefficients for transition j=2 to j=0
table5.dat 30 100000 Rate coefficients for transition j=1 to j=2
table6.dat 30 100000 Rate coefficients for transition j=2 to j=1
table7.dat 30 100000 Rate coefficients for transition j=0 to j=3
table8.dat 30 100000 Rate coefficients for transition j=3 to j=0
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Byte-by-byte Description of file (#): table?.dat
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Bytes Format Units Label Explanations
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1- 6 I6 K Temp Temperature
8- 30 E23.16 cm3/s Rates Rate coefficient
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Acknowledgements:
Jasmeet Singh, jasmeet.singh(at)keshav.du.ac.in,
KMV, Univ. of Delhi, India
(End) Jasmeet Singh [KMV, Delhi Univ., India] Patricia Vannier [CDS] 17-Mar-2021