IR-IR DOUBLE RESONANCE EXPERIMENT OF CH$_{3}$F-($ortho$-H$_{2}$)$_{n}$ CLUSTERS IN SOLID $para$-H$_{2}$
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Date
2012
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Ohio State University
Abstract
FTIR absorption spectrum of the \nu $_{3}$ vibrational band of CH$_{3}$F in solid $para$-H$_{2}$ shows a series of lines at regular intervals, which could be assigned to clusters forming CH$_{3}$F-($ortho$-H$_{2}$)$_{n}$, with n = 0 to 12 nderline{119}, 4731(2003)}. However, such a distinct feature appears only in the \nu $_{3}$ 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 $\mu$m OPO laser and 9 $\mu$m QC laser to the vibrational bands of CH$_{3}$F in solid $para$-H$_{2}$. Because, very recently, high resolution cw-QC laser spectroscopy demonstrated a perfect bleaching effect on a spectral peak in \nu $_{3}$ mode, nderline{13}, 11587 (2011)}. By bleaching the n=1 component of the \nu$_{3}$ band at 9 $\mu$m, we can see a corresponding depletion in the broad spectral feature of the \nu$_{1}$ band at 3 $\mu $m. This simultaneous disappearance of the spectral peaks is a proof of the CH$_{3}$F-($ortho$-H$_{2}$)$_{n}$ cluster model, and it suggests that all the vibrational bands should be explained by the same model.
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Author Institution: Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka Okayama 700-8530 JAPAN; Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551 JAPAN