J/ApJ/813/96 CO ro-vibrational transitions (Song+, 2015)
Quantum calculation of inelastic CO collisions with H.
III. Rate coefficients for ro-vibrational transitions.
Song L., Balakrishnan N., WalkerK.M., Stancil P.C., Thi W.F.,Kamp I.,
van der Avoird A., Groenenboom G.C.
<Astrophys. J., 813, 96 (2015)>
=2015ApJ...813...96S 2015ApJ...813...96S (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: astronomical databases: miscellaneous; ISM: molecules; molecular data;
molecular processes; photon-dominated region, PDR;
protoplanetary disks
Abstract:
We present calculated rate coefficients for ro-vibrational transitions
of CO in collisions with H atoms for a gas temperature range of
10K≤T≤3000K, based on the recent three-dimensional ab initio H-CO
interaction potential of Song et al. (2013JPCA..117.7571S 2013JPCA..117.7571S). Rate
coefficients for ro-vibrational v=1,j=0-30->v'=0,j' transitions were
obtained from scattering cross sections previously computed with the
close-coupling (CC) method by Song et al. (2015JChPh.142t4303S 2015JChPh.142t4303S).
Combining these with the rate coefficients for vibrational v=1-5->v'<v
quenching obtained with the infinite-order sudden approximation, we
propose a new extrapolation scheme that yields the rate coefficients
for ro-vibrational v=2-5,j=0-30->v',j' de-excitation. Cross sections
and rate coefficients for ro-vibrational v=2,j=0-30->v'=1,j'
transitions calculated with the CC method confirm the effectiveness of
this extrapolation scheme. Our calculated and extrapolated rates are
very different from those that have been adopted in the modeling of
many astrophysical environments. The current work provides the most
comprehensive and accurate set of ro-vibrational de-excitation rate
coefficients for the astrophysical modeling of the H-CO collision
system. The application of the previously available and new data sets
in astrophysical slab models shows that the line fluxes typically
change by 20%-70% in high temperature environments (800K) with an
H/H2 ratio of 1; larger changes occur for lower temperatures.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 195 1096 Rate coefficients from close-coupling (CC)
calculations for ro-vibrational transitions
from v=1,j=0-30 to v'=0,j' in the temperature
range T=10-3000K
table2.dat 195 1096 Rate coefficients from close-coupling (CC)
calculations for ro-vibrational transitions
from v=2,j=0-30 to v'=1,j' in the temperature
range T=10-3000K
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See also:
J/A+A/492/257 : Collisional excitation of water in warm media (Faure+, 2008)
J/A+A/432/369 : Leiden Atomic and Molecular Database (LAMDA) (Schoeier+, 2005)
J/A+AS/117/561 : Rovibrational dipole matrix elements for CO (Hure+ 1996)
J/A+AS/117/557 : Einstein coefficients for CO transitions (Chandra+ 1996)
J/ApJS/95/535 : Infrared CO line list for X 1Σ+ state (Goorvitch, 1994)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- j1lev [0/30] rotational level in vibration level
(v=1 for table1 or v=2 for table2)
4- 5 I2 --- j0lev [0/42] rotational level in vibration level
(v=0 for table1 or v=1 for table2)
7- 15 E9.3 cm3/s rdrc10k ro-vibrational de-excitation rate coeff at 10K
17- 25 E9.3 cm3/s rdrc20k ro-vibrational de-excitation rate coeff at 20K
27- 35 E9.3 cm3/s rdrc30k ro-vibrational de-excitation rate coeff at 30K
37- 45 E9.3 cm3/s rdrc40k ro-vibrational de-excitation rate coeff at 40K
47- 55 E9.3 cm3/s rdrc50k ro-vibrational de-excitation rate coeff at 50K
57- 65 E9.3 cm3/s rdrc60k ro-vibrational de-excitation rate coeff at 60K
67- 75 E9.3 cm3/s rdrc70k ro-vibrational de-excitation rate coeff at 70K
77- 85 E9.3 cm3/s rdrc80k ro-vibrational de-excitation rate coeff at 80K
87- 95 E9.3 cm3/s rdrc90k ro-vibrational de-excitation rate coeff at 90K
97-105 E9.3 cm3/s rdrc100k ro-vibrational de-excitation rate coeff at 100K
107-115 E9.3 cm3/s rdrc200k ro-vibrational de-excitation rate coeff at 200K
117-125 E9.3 cm3/s rdrc300k ro-vibrational de-excitation rate coeff at 300K
127-135 E9.3 cm3/s rdrc500k ro-vibrational de-excitation rate coeff at 500K
137-145 E9.3 cm3/s rdrc700k ro-vibrational de-excitation rate coeff at 700K
147-155 E9.3 cm3/s rdrc1000k ro-vibrational de-excitation rate coeff at 1000K
157-165 E9.3 cm3/s rdrc1500k ro-vibrational de-excitation rate coeff at 1500K
167-175 E9.3 cm3/s rdrc2000k ro-vibrational de-excitation rate coeff at 2000K
177-185 E9.3 cm3/s rdrc2500k ro-vibrational de-excitation rate coeff at 2500K
187-195 E9.3 cm3/s rdrc3000k ro-vibrational de-excitation rate coeff at 3000K
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History:
From electronic version of the journal
References:
Yang et al. Paper I. 2013ApJ...771...49Y 2013ApJ...771...49Y
Walker et al. Paper II. 2015ApJ...811...27W 2015ApJ...811...27W
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 15-Feb-2016