Diode laser measurements of intensities, N2-broadening, and self-broadening coefficients of lines of the ν2 band of 14N16O2

Abstract A diode laser spectrometer (resolution 0.0013 cm −1 ) was used to record, in the 12-μm region, high-quality spectra of the ν 2 band of NO 2 . Using these spectra, it was possible to obtain the N 2 -broadening coefficients and an average self-broadening coefficient from measurements made for seven lines of this band. In addition, 30 single spin-component line intensities were measured. From them, through a least-squares fit, the purely vibrational transition moment of the ν 2 band, as well as two correcting rotational terms involved in the expansion of the transition moment operator, were obtained. These results led to the determination of the dipole moment derivative ∂μ x ∂q 2 = −0.0604 1 ± 0.0037 D . It was also demonstrated that there is good consistency between the correcting terms deduced from the observed intensities and their theoretical estimates. Finally, a complete spectrum of the ν 2 band of NO 2 was computed, providing a total band intensity S v ( ν 2 ) = 0.542 × 10 −18 cm −1 /molecule cm −2 at 296 K.