J/A+A/430/1139 Rotational excitation of HF in collision with He (Reese+, 2005)
Rotational excitation and de-excitation of HF molecules by He atoms.
Reese C., Stoecklin T., Voronin A., Rayez J.C.
<Astron. Astrophys. 430, 1139 (2005)>
=2005A&A...430.1139R 2005A&A...430.1139R
ADC_Keywords: Atomic physics
Keywords: molecular data - molecular processes - ISM: molecules
Abstract:
We report Close Coupling calculations of the rotational transitions
induced in collisions between HF molecules and He atoms. We consider
transitions for levels up to J=9 and for temperatures up to 300K. We
use a new global 3D potential energy surface which we proposed
recently and is the best available at the moment. This surface
exhibits two minima associated both with linear geometries
(V=-43.70cm-1 for He-HF and V=-25.88cm-1 for He-FH). Close
Coupling calculations are performed in the collision energy 10-6 to
2000cm-1 interval. Our results validate the estimate, by Neufeld et
al. (1997ApJ...488L.141N 1997ApJ...488L.141N), of the abundance of HF in the interstellar
medium which was detected recently.
Description:
Rotational de-excitation rate coefficient of HF(ji=>jf) are given in
Table 1 for the initial rotational levels ji=9,8,7,6 and in Table 2
for the initial rotational levels ji=5,4,3,2,1 as a function of
temperature in cm3/mol/s the first column gives the transition from
ji->jf in the format ji-jf the 9 next columns give the associated
rate coefficient for the following temperatures in Kelvin :
0.1 1 10 30 50 80 100 200 300
The energies of the HF rotational levels in the ground vibrational
level necessary to calculate the excitation rate coefficients are
given in Table 3
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 84 30 Rotational de-excitation rate coefficients
for the initial rotational levels j=9,8,7,6
table2.dat 84 15 Rotational de-excitation rate coefficients
for the initial rotational levels j=5,4,4,2,1
table3.dat 10 10 Energies of HF rotational levels in the ground
vibrational level
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Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1 I1 --- Ji Initial rotational state
3 I1 --- Jf Final rotational state
5- 12 D8.3 cm+3/s/mol k(T)1 rate coefficient for T=0.1K
14- 21 D8.3 cm+3/s/mol k(T)2 rate coefficient for T=1K
23- 30 D8.3 cm+3/s/mol k(T)3 rate coefficient for T=10K
32- 39 D8.3 cm+3/s/mol k(T)4 rate coefficient for T=30K
41- 48 D8.3 cm+3/s/mol k(T)5 rate coefficient for T=50K
50- 57 D8.3 cm+3/s/mol k(T)6 rate coefficient for T=80K
59- 66 D8.3 cm+3/s/mol k(T)7 rate coefficient for T=100K
68- 75 D8.3 cm+3/s/mol k(T)8 rate coefficient for T=200K
77- 84 D8.3 cm+3/s/mol k(T)9 rate coefficient for T=300K
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1 I1 --- J Rotational level
3- 9 F7.2 cm-1 E Energy
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Acknowledgements: Thierry Stoecklin, t.stoecklin(at)lpcm.u-bordeaux1.fr
(End) Thierry Stoecklin [CNRS, France], Patricia Vannier [CDS] 03-Feb-2005