High Resolution Spectral Survey of Molecular Absorption in the DF Laser Region - Measurements and Calculations

Abstract

^ IThis report has been reviewed by the RADC Information Office (01) and is releasable to the National Technical Information Service (NTIS). At NTIS it will be relersable to the general public including foreign nations. This report has been reviewed and is approved for publication. The air-broadened spectra of N2O, HDO, and CH^ have been measured in the DF laser region between 2545 cm~l and 2745 cm -l. These measurements were performed at a resolution better than the individual absorption line V7idths. The measured spectra are compared with synthetic spectra calculated using the AFCRL Atmospheric Absorption Line Parameters Compilation. For N2O, excellent agreement is found between the measured and calculated spectra. The measured HDO lines tend to be stronger and wider than calculated, by factors of 50% and 25%,

<title>DF laser application for hydrocarbon control in the atmosphere</title>

“…was at least halfthe maximum. Table 1 also demonstrates that the values of a obtained in our work are evidently in a good agreement with a large part of the experimental results performed by many other authors [3][4][5][6][7]. A specific feature of our measurements was an experimental confirmation of the relatively strong absorption in methane of the line P1 (5), which was predicted in previous calculations.…”

“…In particular, the combinations {analytic line/reference line} such as {P1(9)/P2(5)}, {P(9)/P1(8)}, {P1(9)/P2(6)} may be recommended for methane monitoring, {P1(6)/P1(7)} -for ethane, and {P1(7)/P1(8)} -for propane. 5. The sensitivity of hydrocarbon monitoring in air by the differential absorption technique was estimated.…”