Buffer-gas pressure broadening for the (0003)←(0000) band of N2O measured with continuous-wave cavity ring-down spectroscopy

Abstract

Buffer-gas pressure broadening for the (0 0 0 3) (0 0 0 0) band of N 2 O was investigated with continuous-wave cavity ring-down spectroscopy within the temperature range of 243-353 K. The measured absorption profiles were analyzed with Voigt functions. The pressure broadening coefficients, c(gas), and the temperature dependent parameters (broadening exponent) were determined for a variety of buffer gases: N 2 , O 2 , He, Ne, Ar, Kr, and Xe. c(air) values were also determined using c(N 2 ) and c(O 2 ). The effective potential well depth for (N 2 O) 2 under room temperature was estimated from c(Ne, Ar, Kr, Xe) using the Permenter-Seaver's model, and the results were compared with theoretical calculations. Simultaneously, the effective potential well depth for (CO 2 ) 2 is discussed.

Time dependent measurements of nitrous oxide and carbon dioxide collisional relaxation processes by a frequency down-chirped quantum cascade laser: Rapid passage signals and the time dependence of collisional processes

“…We have chosen to make a similar comparison of the N 2 and Ar broadening parameters to those of helium. The parameters obtained in this way are listed in Table VI, where they are compared with the values derived from the work of Nakayama et al 24 It is evident from this comparison that the two sets of data give a similar ␥ N 2 O-Ar Finally it is evident, from Fig. 9, that the broadening efficiency damping gases increases along the series He, Ar, N 2 , and CO 2 .…”

“…We also compared our effective broadening coefficients with those derived from the work of Nakayama et al 24 who studied the pressure broadened line widths of nitrous oxide perturbed by a range of collision partners, including the noble gases, nitrogen and oxygen. Although they did not measure the broadening coefficients for the transitions we have recorded, they derived, for the different buffer gasses, the a, b, and c coefficients of the 1, 1-Padé approximation,…”

Effective interaction energy of water dimer at room temperature: An experimental and theoretical study

“…These MM / k B data are taken from the best estimated values compiled by Tang and Toennies. 3 13 0.1034͑44͒ 0.0594͑23͒ 0.0942͑35͒ 9 27 -8 26 0.0774͑34͒ 0.0411͑23͒ 0.0698͑27͒ 10 19 -9 18 0.0450͑27͒ 0.0236͑27͒ 0.0405͑22͒ 10 28 -9 27 0.0784͑37͒ 0.0391͑17͒ 0.0702͑29͒ 10 37 -9 36 0.0988͑30͒ 0.0503͑28͒ 0.0886͑25͒ 10 46 -9 45 0.0854͑29͒ 0.0390͑34͒ 0.0757͑24͒ 10 55 -9 54 0.0750͑24͒ 0.301͑23͒ 0.0656͑20͒ 11 29 -10 28 0.0662͑30͒ 0.0293͑16͒ 0.0585͑24͒ The obtained experimental result was listed in Table II with the selected literature experimental data of the dimerization enthalpy of H 2 O. 3, M is the cross section for the broadening process calculated by converting ␥ to SI units and multiplying by the factor 2k B T / ͗v r ͘.…”

Air-broadened N2O line-shape parameters and their temperature dependences by requantized classical molecular dynamics simulations

“…3), obtained from fits of measured spectra in the 𝜈 band using the same profile. Since the vibrational dependence of the line broadening for N2O is likely negligible, the measured data of [40], obtained with the Voigt profile for the 3𝜈 band are also plotted in Fig. 3 for comparison.…”