Rotational Energy Transfer Non-Reactive Hydrogen-Hydrogen Collisions at Low Temperatures of Astrophysical Interest

Renat A Sultanov,Dennis Guster

doi:10.1142/s2010194517600539

Abstract

We perform a pure quantum-mechanical calculation for the non-reactive scattering in atomic and molecular hydrogen-hydrogen collisions, i.e. H2+H2 and H+H2. Different potential energy surfaces (PESs) for the H3 and H4 atomic systems have been used. The rigid rotor model of the diatomic molecules, i.e. when the distance between hydrogen atoms is fixed at some average equilibrium value, has been applied in our calculation. After this preparatory stage the astrophysical H2-cooling function can be estimated at different astrophysical conditions and temperatures.

Highlights

Investigations in the fields of atom-molecular and chemical physics are always of significant importance and interest in physics research
In order to carry out the computation of the HD-cooling function the new results from paper 2 can be used, where the potential from 6 has been modified and applied
Hνj1j2→j1j2 is the emitted photon energy, kj1j2→j1j2 (T ) is the thermal rate coefficient (6) corresponding to the rotational transitions j1j2 → j1j2. This result is the main reason that gaining knowledge about the rotational and possibly vibrational excitation/de-excitation rate constants in atomic and molecular hydrogen-hydrogen collisions, such as H2+H2, HD+H2, HD+H etc, is of importance for understanding and modeling the energy balance in the interstellar medium

Summary

Introduction

Investigations in the fields of atom-molecular and chemical physics are always of significant importance and interest in physics research. Different potential energy surfaces (PESs) for the H3 and H4 atomic systems have been used. The rigid rotor model of the diatomic molecules, i.e. when the distance between hydrogen atoms is fixed at some average equilibrium value, has been applied in our calculation.

Objectives

Results

Conclusion