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By C. Bradley Moore

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Details of this technique can be found for instance in Ref. ( 4 ) . The principal experimental difficulties in relaxation studies are to find an efficient and selective way of exci­ ting a vibrational level, and to observe its subsequent decay or the transfer to other levels. The vibrational levels can be populated by several methods. A. Electronic Excitation 1. V. and in the visible facilitates an efficient optical excitation of electronic levels. For instance, Shirk and Bass (43) obser­ ved the fluorescence spectra of CuO in rare gas matrices excited by an argon-ion laser.

5 for all observed bands in the hottest spectrum studied). The actual spectrum, therefore, displays only four distinct branches. However, each branch is doubled due to a strong isotropic magnetic hyperfine interaction arising from the nearly pure 3s orbital character of the odd electron in the molecular X 2 Σ + state (48). The result is the highly complicated spec­ trum shown in Fig. 11 which would have been difficult to analyze at room temperature even if the molecule were stable enough to survive.

Rarified Gas Dynamics 4, 84 (1966). , and Lemonnier, J. , J. Chem. Phys. , Rev. Sei. Instrum. , private communication. A summary of experimental evidence for the validity of this scaling law is found in ref. 6. (a) Burgmans, A. L. , Farrar, J. , and Lee, Y. , J. Chem. Phys. 64, 1345 (1976), and references cited therein. von Deursen, A. P. , J. Chem. Phys. 63, 4559 (1975). Smalley, R. , Auerbach, D. , Fitch, P. S. , Levy, D. , J. Chem. Phys. (in press). , Rarified Gas Dynamics 4, 260 (1966). , Z.

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