AIR-BROADENING AND N-2-BROADENING COEFFICIENTS AND PRESSURE-SHIFT COEFFICIENTS IN THE (CO2)-C-12-O-16 LASER BANDS

In this paper we report the pressure broadening and the pressure-induc ed line shift coefficients for 46 individual rovibrational lines in bo th the (CO2)-C-12-O-16 00(0)1-(10(0)0-02(0)0)(I) and 00(0)1-(10(0)0-02 (0)0)(II) laser bands (laser band I centered at 960.959 cm(-1) and las er band II centered at 1063.735 cm(-1)) determined from spectra record ed with the McMath-Pierce Fourier transform spectrometer. The results were obtained from analysis of 10 long-path laboratory absorption spec tra recorded at room temperature using a multispectrum nonlinear least -squares technique. Pressure effects caused by both air and nitrogen h ave been investigated. The air-broadening coefficients determined in t his study agree well with the values in the 1996 HITRAN database; rati os and standard deviations of the ratios of the present air-broadening measurements to the 1996 HITRAN values for the two laser bands are: 1 .005(15) for laser band I and 1.005(14) for laser band II. Broadening by nitrogen is 3 to 4% larger than that of air. The pressure-induced l ine shift coefficients are found to be transition dependent and differ ent for the P-and R-branch lines with same J '' value. No noticeable d ifferences in the shift coefficients caused by air and nitrogen were f ound. The results obtained are compared with available values previous ly reported in the literature. (C) 1998 Elsevier Science Ltd. All righ ts reserved.