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Investigation of Transient Dispersion and Absorption Phenomena with a Bridge Type Superheterodyne Microwave Spectrometer Measurement of T - Relaxation of S0 and OCS

H. Bomsdorf, H, Dreizler, and H. Mader
Abteilung Chemische Physik im Institut für Physikalische Chemie der Universität Kiel
Z. Naturforsch. 85a, 723-730 (1980);

[received May 191980]

A bridge type superhet spectrometer for time resolved investigation of rotational relaxation is described. Allowing the application of both Stark- and pump-modulation techniques the arrangement may be used for single and double resonance experiments, showing a lot of advantages compared with a conventional Stark- or double resonance-spectrometer. These features are discussed in detail. By means of a MW-pulse method the following two-level experiments have been carried out. The rotational relaxation time T% was measured by detection of M-unresolved transient emission signals for J = 1- 2 of i«0 12 C 32 S, KK ) 1 ^ 3 ^ and 16()13C 32 S in natural isotopic abundance and for eight transitions of SO2 up to J = 43. The signals of transient dispersion were detected and compared with those of transient absorption. Their theoretical description in terms of the two-level Bloch equations is discussed.

I. Introduction