ABSORPTION SPECTRA OF SOLIDS CONDENSED FROM AN ELECTRICAL DISCHARGE THROUGH $OXYGEN^{*}$
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Date
1956
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Ohio State University
Abstract
The products of a high frequency electrical discharge in flowing oxygen are frozen out on a fused silica plate maintained near the temperature of liquid helium. The absorption spectra of the collected meterial are studied as a function of layer thickness and of temperature. Spectra are obtained over the range 2200 to 8500A with prism spectrographs, and from 1 to 3.5 microns with a grating spectrometer, using a cooled lead sulfide detector. The absorption spectrum of the condensate from the discharge through oxygen shows some 25 diffuse bands in the range 3500 to 7000A. A few of these bands correspond to bands observed in solid molecular oxygen. In the ultraviolet there is a strong continuous absorption starting at about 3500A and increasing very rapidly toward shorter wavelengths. In the infrared two bands, about $20 cm^{-1}$ wide, are observed peaking at 3030 and $3499 cm^{-1}$. The band at $3030 cm^{-1}$ may be due to $ozone_{1}$, which in the gas phase has an absorption band at $3050 cm^{-1}$. In addition there are observed six narrow lines (about $2 cm^{-1}$ wide) coming from the fused silica collecting plate. The two strongest lines, at 3364 and $3470 cm^{-1}$, show marked broadening and shift by about $10 cm^{-1}$ to shorter wavelengths upon warming the plate from liquid helium temperature to room temperature.
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$^{*}$This research was supported in part by the United States Air Force through the Air Force Office of of Scientific Research of the Air Research and Development Command under Contract CSO-680-56-30.
Author Institution: National Bureau of Standards
Author Institution: National Bureau of Standards