Molecular Spectroscopy. Modern Research by K.N. Rao (Eds.)

By K.N. Rao (Eds.)

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Rev. A 136,1566 (1964). Κ. B. Jefferts, Phys. Rev. Lett. 23,1476 (1969). R. G. J. Fraser and T. N. Jewitt, Proc. Roy. Soc. Ser. A 1 6 0 , 563 (1937). M. Tinkham and M. W. P. Strandberg, Phys. Rev. 97, 937, 951 (1955). R. Beringer and J. G. Castle, Phys. Rev. 7 8 , 581 (1950). C. C. Lin and M. Mizushima, Phys. Rev. 100,1726(1955). A. Carrington and N. J. D. Lucas, Proc. Roy. Soc. Ser. A 3 1 4 , 567 (1970). A. Carrington, G. N. Currie, and N. J. D. Lucas, Proc. Roy. Soc. Ser A 3 1 5 , 355 (1970).

Thus the type of spectroscopy he performed is very similar to that described in Section 3, but the techniques are quite different. Klemperer and Freund [23] have carried out similar molecular-beam investigations of C O in its excited a Π state, the main differences being that they used electric deflecting fields and a homo­ geneous electric C field. 2 R O T A T I O N A L L E V E L S O F FREE R A D I C A L S 43 that the radiative lifetime be longer than the flight time in the beam chamber. In principle, molecular-beam methods should be suitable for studying free radicals in their ground states, the main problem t o be overcome being that of beam intensity.

Johnson and F. X. Powell, ScienceU9,679 (1970). 2 Rotational Levels of Free Radicals Alan Carrington Department of Chemistry The University of Southampton Hampshire, England 1. Introduction Most of our knowledge of the energy levels of free radicals has been ob­ tained from visible and ultraviolet gas-phase spectroscopy. The development of flash photolysis by Norrish and Porter [1] made it possible to produce high concentrations of free radicals in the gas phase and, both in principle and in practice, it is relatively easy t o record their absorption or emission spectra in the visible and ultraviolet using well-established photographic techniques.

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