: |
: |
|---|
Y. MIYAMOTO, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka Okayama 700-8530 JAPAN; A. MIZOGUCHI AND H. KANAMORI, Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551 JAPAN.
FTIR absorption spectrum of the
3 vibrational band of CH3F in solid para-H2 shows a series of lines at regular intervals, which could be assigned to clusters forming CH3F-(ortho-H2)n, with n = 0 to 12. However, such a distinct feature appears only in the
3 mode but is not observed in the other vibrational modes. In order to solve this problem, we applied IR-IR double resonance spectroscopy using 3 µm OPO laser and 9 µm QC laser to the vibrational bands of CH3F in solid para-H2. Because, very recently, high resolution cw-QC laser spectroscopy demonstrated a perfect bleaching effect on a spectral peak in
3 mode. By bleaching the n=1 component of the
3 band at 9 µm, we can see a corresponding depletion in the broad spectral feature of the
1 band at 3 µ m. This simultaneous disappearance of the spectral peaks is a proof of the CH3F-(ortho-H2)n cluster model, and it suggests that all the vibrational bands should be explained by the same model.