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The Astrophysical Journal Volume 689 Number 2 Create an alert RSS this journal

T.-G. Lee et al. 2008 ApJ 689 1105 doi:10.1086/592560

Rotational Quenching Rate Coefficients for H2 in Collisions with H2 from 2 to 10,000 K

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T.-G. Lee1,2, N. Balakrishnan3, R. C. Forrey4, P. C. Stancil5, G. Shaw6, D. R. Schultz2 and G. J. Ferland1

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Abstract References Cited By
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.

Subject headings

ISM: molecules; molecular data; molecular processes


Dates

Issue 2 (2008 December 20)

Received 2008 May 9, accepted for publication 2008 August 1



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