ABSORPTION OF LIGHT IN GASES
Final rept. 1 Nov 1964-31 Jul 1967
PERKIN-ELMER CORP NORWALK CT ELECTRO-OPTICAL DIV
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Two methods of measuring optical molecular absorptivities in gases, potentially capable of approaching theoretical sensitivity limits of 10 to the minus 8th powercm were studied. An acoustic method was pushed experimentally to a sensitivity of 10 to the minus 5th powercm absorptivity. Practical obstacles to further improvement have been found for the acoustic method. The second method, a laser illuminated spectrophone, was also investigated. Its performance was much closer to the theoretical limit.