Pump and probe spectroscopy of CH3F-(ortho-H2)n clusters in solid parahydrogen by using two CW-IR quantum cascade lasers

Kawasaki, Hiroyuki

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https://hdl.handle.net/2142/91325 Copy

Description

Title

Pump and probe spectroscopy of CH3F-(ortho-H2)n clusters in solid parahydrogen by using two CW-IR quantum cascade lasers

Author(s)

Kawasaki, Hiroyuki

Contributor(s)

• Kanamori, Hideto
• Mizoguchi, Asao

Issue Date

2016-06-20

Keyword(s)

Matrix isolation (and droplets)

Abstract

The absorption spectrum of the $\nu$$_{3}$ (C-F stretching) mode of \chem{CH_3F} in solid {\sl para}-\chem{H_2} by FTIR showed a series of equal interval peaks\footnote{K. Yoshioka and D. T. Anderson, J. Chem. Phys. 119 (2003) 4731-4742}. Their interpretation was that the {\sl n}-th peak of this series was due to \chem{CH_3F}-({\sl ortho}-\chem{H_2})$_{{\sl n}}$ clusters which were formed \chem{CH_3F} and {\sl n}’s {\sl ortho}-\chem{H_2} in first nearest neighbor sites of the {\sl para}-\chem{H_2} crystal with {\sl hcp} structure. In order to understand this system in more detail, we have studied these peaks, especially {\sl n} = 0 – 3 corresponding to 1037 - 1041 \wn, by using high-resolution and high-sensitive infrared quantum cascade laser (QCL) spectroscopy. Before now, we have observed photochromic phenomena of these peaks by taking an advantage of the high brightness of the laser\footnote{A. R. W. McKellar, A. Mizoguchi, and H. Kanamori, Phys. Chem. Chem. Phys. 13 (2011) 11587-11589}. However, it has not been revealed what kind of mechanism is undergoing in these processes. In order to solve this problem we introduced two cw-IR QCLs for pump and prove experiment. While the pumping laser is breaching a certain peak with high power, the probing laser is monitoring the increase of other peaks by rapid scan method. The time resolution of this spectroscopy is 5 msec. The new precise kinetic information will help us to understand the molecular interaction in solid {\sl para}-\chem{H_2}.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

En

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http://hdl.handle.net/2142/91325

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Copyright 2016 by the authors

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