H${}_2$ Ortho-Para Spin Conversion on Inhomogeneous Grain Surfaces. II. impact of the rotational energy difference between adsorbed ortho-H${}_2$ and para-H${}_2$ and implication to deuterium fractionation chemistry

Kenji Furuya, Toshiki Sugimoto, Kazunari Iwasaki +2

We investigate how the H${}_2$ ortho-to-para ratio (OPR) and dueterium fractionation in star-forming regions are affected by nuclear spin conversion (NSC) on dust grains. Particular…