Abstract
New quantum scattering calculations for rotational deexcitation transitions of CO induced by H collisions using two CO-H potential energy surfaces (PESs) from Shepler et al. are reported. State-to-state rate coefficients are computed for temperatures ranging from 1 to 3000 K for CO(v = 0, j) deexcitation from j = 1 to 5 to all lower j′ levels, with j being the rotational quantum number. Different resonance structures in the cross sections are attributed to the differences in the anisotropy and the long-range van der Waals well depths of the two PESs. These differences affect rate coefficients at low temperatures and give an indication of the uncertainty of the results. Significant discrepancies are found between the current rate coefficients and previous results computed using earlier potentials, while the current results satisfy expected propensity rules. Astrophysical applications to modeling far infrared and submillimeter observations are briefly discussed.
| Original language | English (US) |
|---|---|
| Article number | 49 |
| Journal | Astrophysical Journal |
| Volume | 771 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jul 1 2013 |
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All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
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Quantum calculation of inelastic co collisions with H. I. Rotational quenching of low-lying rotational levels. / Yang, Benhui; Stancil, P. C.; Balakrishnan, N.; Forrey, R. C.; Bowman, J. M.
In: Astrophysical Journal, Vol. 771, No. 1, 49, 01.07.2013.Research output: Contribution to journal › Article
TY - JOUR
T1 - Quantum calculation of inelastic co collisions with H. I. Rotational quenching of low-lying rotational levels
AU - Yang, Benhui
AU - Stancil, P. C.
AU - Balakrishnan, N.
AU - Forrey, R. C.
AU - Bowman, J. M.
PY - 2013/7/1
Y1 - 2013/7/1
N2 - New quantum scattering calculations for rotational deexcitation transitions of CO induced by H collisions using two CO-H potential energy surfaces (PESs) from Shepler et al. are reported. State-to-state rate coefficients are computed for temperatures ranging from 1 to 3000 K for CO(v = 0, j) deexcitation from j = 1 to 5 to all lower j′ levels, with j being the rotational quantum number. Different resonance structures in the cross sections are attributed to the differences in the anisotropy and the long-range van der Waals well depths of the two PESs. These differences affect rate coefficients at low temperatures and give an indication of the uncertainty of the results. Significant discrepancies are found between the current rate coefficients and previous results computed using earlier potentials, while the current results satisfy expected propensity rules. Astrophysical applications to modeling far infrared and submillimeter observations are briefly discussed.
AB - New quantum scattering calculations for rotational deexcitation transitions of CO induced by H collisions using two CO-H potential energy surfaces (PESs) from Shepler et al. are reported. State-to-state rate coefficients are computed for temperatures ranging from 1 to 3000 K for CO(v = 0, j) deexcitation from j = 1 to 5 to all lower j′ levels, with j being the rotational quantum number. Different resonance structures in the cross sections are attributed to the differences in the anisotropy and the long-range van der Waals well depths of the two PESs. These differences affect rate coefficients at low temperatures and give an indication of the uncertainty of the results. Significant discrepancies are found between the current rate coefficients and previous results computed using earlier potentials, while the current results satisfy expected propensity rules. Astrophysical applications to modeling far infrared and submillimeter observations are briefly discussed.
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U2 - 10.1088/0004-637X/771/1/49
DO - 10.1088/0004-637X/771/1/49
M3 - Article
AN - SCOPUS:84879392894
VL - 771
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 49
ER -