15min:
INFRARED LASER SPECTROSCOPY OF METHANE-PARAHYDROGEN CLUSTER IN HELIUM DROPLETS.

HIROMICHI HOSHINA, MIKHAIL N. SLIPCHENKO, ANDREY F. VILESOV, Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA.

The clusters of methane with para-hydrogen molecules (CH4-( p -H2)_\mathrmn n=1 sim30) were formed in He droplets and studied via laser depletion spectroscopy. The rotationally resolved nu3 transition of the cluster was observed with changing the number of hydrogen molecules. Large spectral change was seen around n=12 and 30, which suggests the completion of the first and second H2 solvation shells of the CH4 molecule. The aggregate state of the H2 cluster is discussed.