A multispectrum analysis of the 2 ν2 spectral region of H 12C 14N: intensities, broadening and pressure-shift coefficients

Abstract

High-resolution (0.005 cm −1) infrared absorption spectra of HCN in the 2 ν 2 band region near 1411 cm −1 have been recorded at room temperature using the Bruker IFS120HR Fourier transform spectrometer located at Pacific Northwest National Laboratory. Four spectra of high-purity (99.8%) HCN together with three spectra of lean mixtures (∼3%) of HCN in dry air were simultaneously fit using a multispectrum nonlinear least-squares procedure. The analysis yielded room temperature values for absolute intensities, self- and air-broadening coefficients, and self- and air-induced pressure shift coefficients for numerous lines in the 2 ν 2 0 band of H 12C 14N. In addition, intensities, self- and air-broadening coefficients for several lines of the 3 ν 2 1− ν 2 1 hot band, as well as intensities for a number of lines in the 2 ν 2 0 band of H 13C 14N, were also determined. Since there are no previous measurements of broadening and shift parameters reported in the 2 ν 2 0 band, our results are compared with values recently determined in the ν 1 band of H 12C 14N and with current HITRAN values.