The near-ultraviolet absorption spectra of benzene and of hexafluorobenzene vapors were measured over the range 690° to 1900°K. The samples were diluted with argon (90%-99% of inert gas) and shock heated. Absorption coefficients were evaluated at a fixed frequency (Hg,1\2537) as a function of time after passage of the shock front [Ix (t)], and as a function of wavelength at a fixed time interval [1. (1\) J. For temperatures below 1300 0 K for CsHs and 1600 0 K for CsFs, absorptions were recorded prior to the occurrence of significant decomposition of the sample; above these temperatures values were deduced for benzene from measurements extrapolated to zero time.Integrated absorption coefficients (j) for the 1B2"f-1 A1a transition were evaluated for the range in temperature giv~n above and were compared with theoretical analyses of the effect of temperature on/numbers.
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