INFRARED-MICROWAVE TWO-PHOTON SPECTROSCOPY OF THE $\upsilon_{2}$ BAND OF $^{15}NH_{3}$ AND THE $\upsilon_{3}$ BAND OF $^{13}CH_{3}F^{\ast}$
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Date
1982
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Volume Title
Publisher
Ohio State University
Abstract
An infrared-microwave two-photon spectrometer operating under computer control with $CO_{2}$ or $N_{2}O$ lasers with microwave radiation in the 8-18 GHz region has been used to record 54 transition in the $\upsilon_{2}$ vibration-rotation band of $^{15}NH_{3}$ and 14 transitions in the $\upsilon_{3}$ band of $^{13}CH_{3}F$. The frequencies of these transitions have been obtained by numerical fitting of the lineshapes. The overall accuracy of frequency measurement is estimated to be $\pm 0.0002 cm^{-1}$, with the main contribution to the uncertainty coming from the uncertainty in the laser frequency. The two-photon frequencies for $^{15}NH_{3}$ have been combined with previous two-photon $frequencies,^{1,2}$ diode laser $measurements,^{3}$ and microwave inversion $frequencies^{4}$ to obtain vibration-rotation constants for the states involved. The two-photon frequencies for $^{13}CH_{3}F$ have been combined with previous two-photon $frequencies,^{5}$ laser-Stark $measurements,^{5}$ and ground state rotational constants from microwave $spectroscopy^{6}$ to obtain vibration-rotation constants for the upper state.
Description
$^{\ast}$This work was supported by the National Science Foundation. $^{1}$S.M. Freund and Takeshi Oka, Phys. Rev. A13, 2178(1976). $^{2}$H. Jones, J. Mol. Spectrosc, 70, 279(1978). $^{3}$J.P. Sattler and T.L. Worchesky, J. Mol. Spectrosc. 90, 297(1981). $^{4}$H. Sasada, J. Mol. Spectrosc. 83, 15(1980). $^{5}$S.M. Fround, G. Duxbury, M. R\""omheld, J.T. Tiedje, and T. Oka, J. Mol. Spectrosc. 52, 38(1974). $^{6}$O.R. Gilliam, H.D. Edwards and Walter Gordy, Phys. Rev. 75, 1014(1949).