Astrophysics

Quantitative modeling of molecular processes in astrophysical environments requires accurate rate coefficients for chemical reactions and molecular collisions of importance in astrophysical media. Since H2 is the most abundant molecule in the universe, we have put significant efforts to calculate rate coefficients for rovibrational transitions in H2 induced by collisions with H, He, H2 and CO. These calculations are being performed in collaborations with Prof. Phillip Stancil (UGA), Prof. Robert Forrey (Penn State), Prof. Gary Ferland (Kentucky) and Prof. Alex Dalgarno (Harvard). The computed rate coefficients are being incorporated into the photoionization CLOUDY code developed by Prof. Ferland and coworkers. We have also been involved studies of chemical reactions of interest in interstellar medium. Recent calculations have focused on the OH+O? H+O2 which is considered to be an important process related to oxygen chemistry in the interstellar medium. Click here to see more publications.

Selected Publications

Quenching

Figure 1. Rate coefficients for the quenching of vibrationally excited H2 by collisions with He. In the limit of zero temperature, the quenching rate coefficients become finite for a given vibrational level in accordance with Wigner's law.


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