Approved for public release; distribution unlimited 13. NUMBER OF PAGES ■ 3e 15. SECURITY CLASS, (ol Ihli tmpart) UNCLASSIFIED

Sponsored by Dafense Advanced Research Project! Agency ARPA Order No. 1279 ycrcrc Approved for public release: distribution unlimited. The views and conclusions contained in this document are those of It ;S«T,-nd^Uld ^ b ' lnt^r eted as neceaearily repenting the officisl policies, either expressed or Implied, of the Defense Advanced Rasssrch Project. Agency or the V.S. GovirSeJt?

SECURITY CLASSIFICATION OF THIS PAGEflVhen Dmta En(er»dJ "n n CH^, 0.28 ppm N2O, temperature 296K, total pressure 760 torx). the total molecular absorption coefficients are between (3.18 x 10"^ km-^ andv3..,16_j^ lO-1 lan~Vcorresponding to a transmittance over a 10 Ian path of from 31 to 73 percent Assuming the mid-latitude summer model atmosphere, the water vapor^jtontinuum absorption coefficient for the eight lines is approximat«ly 0.02Oaa-,; The measured HDD absorption coefficients vary from 0.006 uan"! to 0.095 kmi for the linps studied and the N'-jO absorption coefficients vary from (002 lyn-"-'to " ■. The-CH, absorption coefficients were found to be on the order of '. The accuracy of the measured absorption coefficients is ICH _km-± ' a :r H 0^ sKe? ,£■-• fa* Measurements of H2O absorption at 24 U C with 14.3 torr lLO and 760 torr total pressure confirm the water continuum absorption coefficients obtained by extrapolating the high temperature measurements of Burch. The experimental results obtained in this study were compared with calculations made from the AFCRL line compilation. The theoretical background for making such calculations is thoroughly discussed, and listings ot two computer programs written to perform the calculations are presented. The calculated values for the NjO absorption coefficients agree very well with the experimentally measured absorption cofficients. For other gases the agreement between calculation and measurement is not as good, although in most cases the calculated absorption coefficients are of the same order of magnitude as the experimentally measured results.

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