# DETERMINATION OF $T_{2}/T_{1}$ FOR $^{15}NH_{3}$ TRANSITIONS BY ANALYSIS OF POWER-BROADENED LINESHAPES

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 Title: DETERMINATION OF $T_{2}/T_{1}$ FOR $^{15}NH_{3}$ TRANSITIONS BY ANALYSIS OF POWER-BROADENED LINESHAPES Creators: Amano, T.; Schwendeman, R.H. Issue Date: 1976 Publisher: Ohio State University Abstract: Power-broadened lineshapes have been recorded for thirteen inversion transitions of $15_{NH_{3}}$ with a computer-controlled microwave spectrometer. The line profiles were recorded for each transition at several sample pressures and microwave powers. The recorded points were found to fit very well to a theoretical line shape which depends not only on the polarization relaxation time $T_{2}$ but also on the function $(T_{1}/T_{2}) ({\mu}{\in}_{o}/h)^{2}$ where $T_{1}$ is the population relaxation time., $\mu$ is the dipole moment matrix element, and $\in_{o}$ is the amplitude of the electric field of the radiation. Therefore, by careful measurement of the microwave power it was possible to determine both $T_{1}$ and $T_{2}$. The values of $T_{2}/T_{1}$ for the thirteen transitions in $^{15}NH_{3}$ were found to be all greater than one, ranging from 1.1 to 1.6. Description: This work was supported by the U. S. Energy Research and Development Administration. Present address of Amy Sue Rispin: Laboratory of Chemical Physics, National Institutes of Health, Bethasda, Maryland, 20014 Author Institution: Department of Chemistry, Michigan State University URI: http://hdl.handle.net/1811/9885 Other Identifiers: 1976-TS-10