NOBLE-GAS BROADENING IN FUNDAMENTAL BANDS OF H2S

For 23 lines from ail three fundamental bands of H2S, noble gas broade ning coefficients were measured applying a two-channel diode laser spe ctrometer in pulsed mode. Altogether for 17 lines from the nu(1) band (3 less than or equal to J '' less than or equal to 17, 0 less than or equal to K-a '' less than or equal to 6), 1 line from the nu(2) band (J '' = 4, K-a '' = 3), and 5 lines from the nu(3) band (3 less than o r equal to J '' less than or equal to 7, 1 less than or equal to K-a ' ' less than or equal to 7) broadening coefficients gamma(H2S-noble gas ) for collisions with helium, neon, argon, krypton, and xenon were det ermined. The broadening coefficients for lines from different bands wi th similar rotational quantum numbers are comparable. Within the studi ed quantum number range, as in the case of collisions with H2S and air , the broadening coefficients show a pronounced J '' dependence but no K-a '' dependence. The values for gamma(H2S-noble gas) decrease stron gly with increasing J ''. The largest change is observable for collisi ons with argon and krypton where a decrease in gamma(H2S-noble gas) fr om values of about 0.1 to 0.013 cm(-1)/atm occurs. The broadening coef ficients for collisions with different noble gas perturbers for the ma jority of lines follow the trends gamma(H2S-He) > gamma(H2S-Ne) < gamm a(H2S-Ar), gamma(H2S-Ar) < < gamma>(H2S-Kr), and gamma(H2S-Kr) approxi mate to gamma(H2S-Xe). (C) 1997 Academic Press.