Measurements of the water vapor continuum absorption by OFCEAS at 3.50 µm and 2.32 µm

Measurements of the water vapor absorption cross-sections at two spectral points 2.1 µm and 4.0 transparency windows are performed by optical feedback cavity enhanced spectroscopy (OFCEAS). The self-continuum cross-section, CS, is measured for temperature values 30 47°C (303 320 K) 2853 cm−1 point, corresponding to lowest opacity region window. CS derived from pressure squared dependence self-continuum, found consistent with previous CEAS measurements in considered window but significantly smaller than Fourier transform (FTS). discussed relation FTS high temperature. Foreign-continuum cross-sections, CF, newly obtained OFCEAS spectra moist air flow regime 4302 point low energy edge After subtraction monomer contributions, CF linear variation foreign-continuum product partial pressures. were 34 (307 no significant dependency was observed. present value gathered seven This set used derive a polynomial fit, empirical frequency CF(ν) over 4250-5000 range. Overall, semi-empirical MT_CKD_3.5 underestimated centre