Raman spectra and cross sections of ammonia, chlorine, hydrogen sulfide, phosgene, and sulfur dioxide toxic gases in the fingerprint region 400-1400 cm-1

Raman spectra of ammonia (NH3), chlorine (Cl-2), hydrogen sulfide (H2S), phosgene (COCl2), and sulfur dioxide (SO2) toxic gases have been measured in the fingerprint region 400-1400 cm(-1). A relatively compact (< 2'x2'x2'), sensitive, 532 nm 10WCW Raman system with double-pass laser and double-sided collection was used for these measurements. Two Raman modes are observed at 934 and 967 cm(-1) in NH3. Three Raman modes are observed in Cl-2 at 554, 547, and 539 cm(-1), which are due to the 35/35 35/37, and 37/37 Cl isotopes, respectively. Raman modes are observed at 870, 570, and 1151 cm(-1) in H2S, COCl2, and SO2, respectively. Values of 3.68 +/- 0.26x10(-32) cm(2)/sr (3.68 +/- 0.26x10(-36) m(2)/sr), 1.37 +/- 0.10x10(-30) cm(2)/sr (1.37 +/- 0.10x10(-34) m(2)/sr), 3.25 +/- 0.23x10(-31) cm(2)/sr (3.25 +/- 0.23x10(-35) m(2)/sr), 1.63 +/- 0.14x10(-30) cm(2)/sr (1.63 +/- 0.14x10(-34) m(2)/sr), and 3.08 +/- 0.22x10(-30) cm(2)/sr (and 3.08 +/- 0.22x10(-34) m(2)/sr) were determined for the differential Raman cross section of the 967 cm(-1) mode of NH3, sum of the 554, 547, and 539 cm(-1) modes of Cl-2, 870 cm(-1) mode of H2S, 570 cm(-1) mode of COCl2, and 1151 cm(-1) mode of SO2, respectively, using the differential Raman cross section of 3.56 +/- 0.14x10(-31) cm(2)/sr (3.56 +/- 0.14x10(-35) m(2)/sr) for the 1285 cm(-1) mode of CO2 as the reference. (C) 2016 Author(s).