15min:

YUKI MIYAMOTO, Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan; MIZUHO FUSHITANI, Institute fur Experimentalphysik, Freie Universitat Berlin, Arnimallee 14, 14195, Berlin, Germany; HIROMICHI HOSHINA, Terahertz Sensing and Imaging Laboratory, RIKEN; 519-1399 Aramaki Aoba, Sendai 980-0845, Japan; AND TAKAMASA MOMOSE, Department of Chemistry, The University of British Columbia, Vancouver, B.C., V6T1Z1, Canada.

Products of in-situ photolysis of methyl iodide isolated in solid para-hydrogen and solid ortho-deuterium were investigated by high-resolution FTIR spectroscopy. The ₃ and ₄ vibrational transitions of a methyl radical and the ²P_1/2 ²P_3/2 transition of an iodine atom were clearly observed in both solids after the photolysis, which indicates a small cage effect in hydrogen crystals. The vibrational transitions of the methyl radical showed a rotational structure subjected to crystal field splittings. Temperature dependence of the spectra allowed us to analyze the spectral fine structure completely based on our crystal field theory. On the other hand, the magnetic dipole transition of the iodine atom showed a rotational satellite induced by hydrogen molecules. The rotational satellite indictates a strong electron-roton coupling in solid hydrogen. Details of the analysis will be discussed.