STARK SPECTROSCOPY OF THE $\nu _{4}$ BAND OF $POF_{3}$ WITH A 10 $\mu m$ $CO_{2}$ LASER
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Date
1977
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Ohio State University
Abstract
A laser Stark spectrometer has been used to record the spectrum of the $\nu^{4}$-band of $POF_{3}$ with the R(38) to R(52) laser lines of the 10.4 $\mu m$ band of $CO_{2}$. The sample cell consists of a 6-inch Pyrex tee which contains a pair of polished nickel plates separated by six precision-ground quartz spacers (nominal thickness, 1 mm). An electric field up to 60 kv/cm can be applied at a sample pressure of 5 mTorr, A 10 kHz sinusoidal modulation was applied to one of the plates. The signal detected by a Pb-Sn-Te photovoltaic detector was amplified, phase-sensitively detected, and displayed on an oscilloscope or a chart recorder. The $POF_{3}$ molecule, which is accidentally very close to a spherical top, has a small rotational constant $(B_{o} = 4,6$ GHz) for ordinary infrared spectroscopy. No high-resolution infrared study has been reported. The Stark spectrum appeared extremely complicated with many overlapping lines. More than sixty transitions were assigned, although a great number of lines remain unassigned. The electric dipole moments in both the ground and excited states were determined precisely along with other molecular constants.
Description
This research was supported, in part, by the U.S. National Science Foundation.
Author Institution: Department of Chemistry, Michigan State University
Author Institution: Department of Chemistry, Michigan State University