SOME RECENT STUDIES OF THE ABSORPTION SPECTRA OF FREE RADICALS USING A NEW FLASH PHOTOLYSIS APPARATUS
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Date
1959
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Ohio State University
Abstract
A new flash photolysis apparatus is being constructed in which a 30,000 J bank of condensers is to be discharged through two photolysis flash lamps each 1 meter long. The absorption tube is 2 meters long and contains a series of mirrors capable of giving up to 80 traversals of the tube. Preliminary experiments have been carried out with a single photolysis lamp and discharge energies up to 10,000 J. Using path lengths of 40 meters considerably stronger absorption spectra have been obtained than have previously been $reported.^{1}$ The $NH_{2}$ spectrum which previously had been observed in the region 4000 to 8300 \AA has now been extended to 9400 \AA in the red and 3500 \AA in the violet. Improved spectra of $ND_{2}$ have also been obtained. The HCO and DCO spectrum reported by Herzberg and $Ramsay^{2}$ has been considerably extended. All three vibration frequencies in the excited state have now been obtained and in addition """"hot"""" bands arising from the bending vibration in the lower state have been observed. The molecular constants of HCO and DCO will be discussed. A new spectrum has been observed in the region 2900 \AA to 3200 \AA during the flash photolysis of $CH_{3}NH_{2}$ and isotope shifts have been observed with $CH_{3}ND_{2}$. The spectrum has also been observed during the flash photolysis of $NH_{2}CH_{2}CH_{2}NH_{2}$ and is tentatively assigned to the $CH_{2}NH_{2}$ radical.
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$^{1}$ Ramsay, D. A. Mem. Soc. Roy. Sci. Liege 18 , 471 (1957). $^{2}$ Herzberg, G. and Ramsay, D. A., Proc. Roy. Soc. (London) A233 , 34 (1955).
Author Institution: Division of Pure Physics, National Research Council
Author Institution: Division of Pure Physics, National Research Council