Vm. Devi et al., PRESSURE BROADENING AND PRESSURE SHIFT COEFFICIENTS IN THE 2V(2)(0) AND V(1) BANDS OF (OCO)-O-16-C-13-O-18, Journal of quantitative spectroscopy & radiative transfer, 60(5), 1998, pp. 771-783
In this study we report the first measurements of the pressure broaden
ing and the pressure-induced line shift coefficients due to air and ni
trogen for 93 individual rovibrational lines, P(46) to R(46) and P(50)
to R(45), respectively, belonging to the 2 nu(2)(0) and nu(1) bands o
f (OCO)-O-16-C-13-O-18. The results were obtained by analyzing ten lon
g path, high-resolution laboratory absorption spectra using a multispe
ctrum nonlinear least-squares technique. Broadening due to nitrogen wa
s about 4% larger than by air. Similar to broadening coefficients, the
pressure-shift coefficients were found to be transition dependent, bu
t different for the P- and R-branch lines with the same rotational qua
ntum number, J. Except for a few R-branch lines, the measured shift co
efficients were negative. The shift coefficients varied from +4 x 10(-
3) cm(-1)atm(-1) at 296 K to - 5.6 x 10(-3) cm(-1)atm(-1) at 296 K. Co
mparisons of the broadening and shift coefficients between the two ban
ds, between the P and R branches, and between the two broadening gases
are reported. No significant difference between shift coefficients of
the two bands or the two broadening gases was observed. The results o
btained were compared with those reported in the literature for the mo
re abundant (CO2)-C-12-O-16 species. (C) 1998 Elsevier Science Ltd. Al
l rights reserved.