UNIVERSAL MICROWAVE INTENSITY CURVE THE "POWER-SHIFT" IN MICROWAVE SPECTROSCOPY.

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1967

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Ohio State University

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Abstract

A new microwave spectroscopy intensity coefficient, I', has been proposed as an alternative to the conventional (Beer's Law) intensity $coefficient.^{1}$ This paper discusses the characteristics of the curve obtained by plotting $\log \Gamma$ against $\log P_{0}$ where $P_{0}$ is the incident microwave power. This intensity curve can be labeled ``universal'' in the sense that curves from any microwave absorption line can be superimposed by a simple translation of coordinates. The existence of such a relationship for microwave absorption lines is important. For example, the accuracy of the absorbing species' molecular density calculated from microwave intensity measurements can be improved by using this curve. In addition, the position of this curve along the $\log P_{0}$ axis for any line depends on the power saturation coefficient of that line. Any change in the power saturation coefficient will produce a ``power-shift'' in the universal curve along this axis. Therefore it appears possible to gain broadening-relaxation information from power-shift data. These and other implications of the universal intensity curve will be discussed.

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$^{1}$ H. W. Harrington, \emph{Journal of Chemical Physics}, May (1967).
Author Institution: Hewlett-Packard Company 1501 Page Mill Road, Palo Alto, California, 94304.

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