Emission spectra of group 13 metal atoms and indium hydrides in solid H and D

Infrared spectra of solid hydrogen (deuterium) samples co-deposited at 3.5 K with laser-ablated Al, Ga, In, and Tl atoms reveal infrared absorptions for the MH [MD] molecules. Irradiation at 193 nm increases MH and MH [MD and MD ] absorptions and produces emission spectra for the metal atoms except for Al and phosphorescence spectra for the InH [InD] molecules. Unreacted metal emission bands are blue-shifted from the gas phase more by solid D than by solid H . However, the emission yield for InD is much higher in solid D than for InH in solid H , which suggests a higher nonradiative relaxation rate in solid H than in solid D owing to the larger zero-point motion.