Rotational quenching rate coefficients for H2 in collisions With H2, From 2 TO 10,000 K

T. G. Lee, N. Balakrishnan, Robert C. Forrey, P. C. Stancil, G. Shaw, D. R. Schultz, G. J. Ferland

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Rate coefficients for rotational transitions in H2 induced by H2 impact are presented. Extensive quantum mechanical coupled-channel calculations based on a recently published (H2)2 potential energy surface were performed. The potential energy surface used here has been demonstrated to be more reliable than surfaces used in previous work. Rotational transition cross sections with initial levels of J ≤ 8 were computed for collision energies ranging between 10-4 and 2.5 eV, and the corresponding rate coefficients were calculated for the temperature range 2 ≤ T ≤ 10,000 K. In general, agreement with earlier calculations, which were limited to 100-6000 K, is good, although discrepancies are found at the lowest and highest temperatures. Low-density-limit cooling functions due to para- and ortho-H2 collisions are obtained from the collisional rate coefficients. Implications of the new results for nonthermal H2 rotational distributions in molecular regions are also investigated.

Original languageEnglish (US)
Pages (from-to)1105-1111
Number of pages7
JournalAstrophysical Journal
Volume689
Issue number2
DOIs
StatePublished - Dec 20 2008

Fingerprint

collision
quenching
potential energy
collisions
coefficients
cross section
cooling
cross sections
energy
rate
temperature
calculation
distribution

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Lee, T. G., Balakrishnan, N., Forrey, R. C., Stancil, P. C., Shaw, G., Schultz, D. R., & Ferland, G. J. (2008). Rotational quenching rate coefficients for H2 in collisions With H2, From 2 TO 10,000 K. Astrophysical Journal, 689(2), 1105-1111. https://doi.org/10.1086/592560
Lee, T. G. ; Balakrishnan, N. ; Forrey, Robert C. ; Stancil, P. C. ; Shaw, G. ; Schultz, D. R. ; Ferland, G. J. / Rotational quenching rate coefficients for H2 in collisions With H2, From 2 TO 10,000 K. In: Astrophysical Journal. 2008 ; Vol. 689, No. 2. pp. 1105-1111.
@article{bc83a8a0d42b471b8b711bdc95691f6a,
title = "Rotational quenching rate coefficients for H2 in collisions With H2, From 2 TO 10,000 K",
abstract = "Rate coefficients for rotational transitions in H2 induced by H2 impact are presented. Extensive quantum mechanical coupled-channel calculations based on a recently published (H2)2 potential energy surface were performed. The potential energy surface used here has been demonstrated to be more reliable than surfaces used in previous work. Rotational transition cross sections with initial levels of J ≤ 8 were computed for collision energies ranging between 10-4 and 2.5 eV, and the corresponding rate coefficients were calculated for the temperature range 2 ≤ T ≤ 10,000 K. In general, agreement with earlier calculations, which were limited to 100-6000 K, is good, although discrepancies are found at the lowest and highest temperatures. Low-density-limit cooling functions due to para- and ortho-H2 collisions are obtained from the collisional rate coefficients. Implications of the new results for nonthermal H2 rotational distributions in molecular regions are also investigated.",
author = "Lee, {T. G.} and N. Balakrishnan and Forrey, {Robert C.} and Stancil, {P. C.} and G. Shaw and Schultz, {D. R.} and Ferland, {G. J.}",
year = "2008",
month = "12",
day = "20",
doi = "10.1086/592560",
language = "English (US)",
volume = "689",
pages = "1105--1111",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

Lee, TG, Balakrishnan, N, Forrey, RC, Stancil, PC, Shaw, G, Schultz, DR & Ferland, GJ 2008, 'Rotational quenching rate coefficients for H2 in collisions With H2, From 2 TO 10,000 K', Astrophysical Journal, vol. 689, no. 2, pp. 1105-1111. https://doi.org/10.1086/592560

Rotational quenching rate coefficients for H2 in collisions With H2, From 2 TO 10,000 K. / Lee, T. G.; Balakrishnan, N.; Forrey, Robert C.; Stancil, P. C.; Shaw, G.; Schultz, D. R.; Ferland, G. J.

In: Astrophysical Journal, Vol. 689, No. 2, 20.12.2008, p. 1105-1111.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Rotational quenching rate coefficients for H2 in collisions With H2, From 2 TO 10,000 K

AU - Lee, T. G.

AU - Balakrishnan, N.

AU - Forrey, Robert C.

AU - Stancil, P. C.

AU - Shaw, G.

AU - Schultz, D. R.

AU - Ferland, G. J.

PY - 2008/12/20

Y1 - 2008/12/20

N2 - Rate coefficients for rotational transitions in H2 induced by H2 impact are presented. Extensive quantum mechanical coupled-channel calculations based on a recently published (H2)2 potential energy surface were performed. The potential energy surface used here has been demonstrated to be more reliable than surfaces used in previous work. Rotational transition cross sections with initial levels of J ≤ 8 were computed for collision energies ranging between 10-4 and 2.5 eV, and the corresponding rate coefficients were calculated for the temperature range 2 ≤ T ≤ 10,000 K. In general, agreement with earlier calculations, which were limited to 100-6000 K, is good, although discrepancies are found at the lowest and highest temperatures. Low-density-limit cooling functions due to para- and ortho-H2 collisions are obtained from the collisional rate coefficients. Implications of the new results for nonthermal H2 rotational distributions in molecular regions are also investigated.

AB - Rate coefficients for rotational transitions in H2 induced by H2 impact are presented. Extensive quantum mechanical coupled-channel calculations based on a recently published (H2)2 potential energy surface were performed. The potential energy surface used here has been demonstrated to be more reliable than surfaces used in previous work. Rotational transition cross sections with initial levels of J ≤ 8 were computed for collision energies ranging between 10-4 and 2.5 eV, and the corresponding rate coefficients were calculated for the temperature range 2 ≤ T ≤ 10,000 K. In general, agreement with earlier calculations, which were limited to 100-6000 K, is good, although discrepancies are found at the lowest and highest temperatures. Low-density-limit cooling functions due to para- and ortho-H2 collisions are obtained from the collisional rate coefficients. Implications of the new results for nonthermal H2 rotational distributions in molecular regions are also investigated.

UR - http://www.scopus.com/inward/record.url?scp=58149114884&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=58149114884&partnerID=8YFLogxK

U2 - 10.1086/592560

DO - 10.1086/592560

M3 - Article

VL - 689

SP - 1105

EP - 1111

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

ER -