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 30) were formed in He droplets and studied via laser depletion spectroscopy. The rotationally resolved 3 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.