Pressure-broadened linewidths of nitric oxide

Abstract

N2-broadened linewidths of NO in the 5.4 μ band have been measured. This provides a means of determining the quadrupole moment of NO, which has been poorly measured so far. Using the Anderson–Tsao–Curnutte theory of line broadening, and this new value, 2.4×10−26 esu⋅cm2, for the quadrupole moment of NO, self-broadened and foreign-gas (N2 and O2) -broadened linewidths of NO at 300°K for all important infrared transitions are calculated. In the self-broadening calculations, dipole–dipole, dipole–quadrupole, quadrupole–dipole, quadrupole–quadrupole, induced, and dispersion interactions were taken into account. For the case of foreign-gas broadening, dipole–quadrupole, quadrupole–quadrupole, dipole–hexadecapole, quadrupole–hexadecapole, induced, and dispersion interactions were considered. Air-broadened linewidths of NO have also been computed at 200, 250, and 300°K.

The NO Vibrational Fundamental Band: O2-Broadening Coefficients

“…which is on the order of 5% for |m| Ն 6.5. Our measurements for broadening are in poor agreement with the calculations of Tejwani et al (12), but in excellent agreement with those of Houdeau et al (13). The information provided in this paper and Refs.…”

“…There have been no previous measurements of the O 2 broadening of NO rovibrational lines, but a calculation was performed using ATC theory (10, 11) by Tejwani et al (12). In addition, they also made calculations with N 2 as a collision partner as well as measured a few R-branch lines.…”

N2- and O2-Broadenings and Lineshapes of the 551.53-GHz Line of 14NO

“…As usually, the obtained results are in fair agreement with the T −n law (Eq. [3]). They are gathered in Table 4 along with previous theoretical and experimental ones for the purpose of comparison.…”

“…Nitric oxide could be a candidate as a target molecule to be detected in the atmosphere of Mars from ground-based heterodyne observation in the millimeter wave region (2). As a consequence NO, which is of aeronomical interest, has been the subject of extensive spectroscopic investigations in the infrared and millimeter wave ranges, not only for line position and line strength measurements, but also for linewidth determinations (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22).…”

Temperature Dependence of Nitrogen Broadening of the NO Fundamental Vibrational Band

“…The transitions observed obey the selection rule DV Å 0. Previous All of the spectra used for this work were recorded with work (2-6) on the temperature dependence of N 2 broadening the Fourier transform spectrometer (FTS) at the McMath spans a composite temperature range of 163 to 1975 K. Solar Observatory, Kitt Peak, Arizona and a cryogenically Tejwani et al (2) used their measured R-branch coefficients cooled 30-cm absorption cell designed and built at the Ames laboratory. Nominally identical operating parameters were used with Experimental Conditions a and interferograms were weakly apodized as described in our previous paper (see Eq.…”