J/A+A/493/687 Rotational excitation of formaldehyde by H2 (Faure+, 2009)
Rotational excitation of formaldehyde by hydrogen molecules:
ortho-H2CO at low temperature.
Troscompt N., Faure A., Wiesenfeld L., Ceccarelli C., Valiron P.
<Astron. Astrophys. 493, 687 (2009)>
=2009A&A...493..687T 2009A&A...493..687T
ADC_Keywords: Atomic physics
Keywords: molecular data - molecular processes - ISM: molecules
Abstract:
Rate coefficients for the rotational excitation of the ten lowest
levels of ortho-H2CO by collisions with H2 molecules are computed
for kinetic temperatures in the range 5-100K.
Description:
Coefficients "ai" of the polynomial fit, Eq. (1) of Troscompt et al.
2009A&A...493..687T 2009A&A...493..687T, to the rotational de-excitation rate coefficients
of ortho-H2CO by para-H2 (J2=0) and ortho-H2 (J2=1). These
coefficients are only valid in the temperature range 5-100 K. Eup(K)
are the upper level energies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
oh2colev.dat 45 40 Rotational energy levels of ortho-H2CO in its
ground vibrational state
h2co_oo.dat 76 45 oH2CO-oH2 collisional fit
h2co_op.dat 76 45 oH2CO-pH2 collisional fit
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See also:
J/A+A/472/1029 : (De)excitation rates of H2O by H2 (Faure+, 2007)
J/A+A/492/257 : Collisional excitation of water in warm media (Faure+, 2008)
J/MNRAS/399/425 : (De)excitation rates of ortho-NH3 and para-NH3 (Faure+, 2009)
Byte-by-byte Description of file (%): oh2colev.dat
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Bytes Format Units Label Explanations
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2- 3 I2 --- Level Level number
12- 13 I2 --- g Degeneracy of the level
21- 28 F8.4 cm-1 E Energy
36- 37 I2 --- J J quantum number
41 I1 --- Ka Ka quantum number
44- 45 I2 --- Kc Kc quantum number
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Byte-by-byte Description of file (%): h2co_oo.dat h2co_op.dat
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Bytes Format Units Label Explanations
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2 I1 --- Ju Rotational quantum number for the Upper level
4 I1 --- Kau Ka quantum number for the Upper Level
6 I1 --- Kcu Kc quantum number for the Upper Level
9 I1 --- Jl Rotational quantum number for the Lower level
11 I1 --- Kal Ka quantum number for the Lower Level
13 I1 --- Kcl Kc quantum number for the Lower Level
18- 21 F4.1 K Eup Energy of upper level
26- 32 F7.3 --- a0 order 0 coefficient of the fit
37- 44 F8.3 --- a1 order 1 coefficient of the fit
48- 55 F8.3 --- a2 order 2 coefficient of the fit
59- 66 F8.3 --- a3 order 3 coefficient of the fit
70- 76 F7.3 --- a4 order 4 coefficient of the fit
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Acknowledgements:
Nicolas Troscompt, Nicolas.Troscompt(at)obs.ujf-grenoble.fr
History:
* 15-Jan-2009: First version
* 11-Jun-2009: Corrected h2co_oo.dat and h2co_op.dat files, from author
(End) Patricia Vannier [CDS] 15-Jan-2009