Affiliation:
1. Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606, Japan
Abstract
Molecular dynamics in organic solution is investigated by the transient grating method with a nanosecond
pulsed laser and a fast detection system. First, the dynamics of methyl red (MR) is studied for the probe
of the translational diffusion process of solution. The origin of the TG signal which represents the mass
diffusion is attributed to the phase grating created by the different refractive indices of the cis and trans
forms. The cis form of MR, which has a slightly smaller molecular volume than the trans form is found
to diffuse more slowly in alcoholic and aldehyde solutions. The measured diffusion coefficients (D) are
compared with theoretically calculated values. Second, the TG method is applied to elucidate the
dynamics of transient radicals created by photochemical reactions. The determined D of the radicals are
about 3∼4 times smaller than those of the parent non-radical molecules even though the molecular
volumes are similar to each other. The advantages as well as the disadvantages of the TG method for
elucidating the solvent dynamics are discussed.
Subject
Spectroscopy,Biochemistry,Atomic and Molecular Physics, and Optics
Cited by
13 articles.
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