Devi V M, Benner D C, Smith M A, Rinsland C P
Appl Opt. 1991 Jan 20;30(3):287-304. doi: 10.1364/AO.30.000287.
Air-, nitrogen-, and oxygen-broadened halfwidth and pressure-induced line shift coefficients have been measured for over seventy-five individual vibration-rotation transitions in the v(3) fundamental band of (13)CH(4)at 3 mum from room temperature IR laboratory absorption spectra recorded at a 0.01-cm(-1) resolution with a Fourier transform spectrometer. Transitions up to J" = 13 in the P-branch and J" = 7 in the R-branch were analyzed using a nonlinear least-squares curve fitting technique assuming a Voigt line shape. From the analysis, we have determined the mean ratios of air- to nitrogen-broadened and air- to oxygen-broadened halfwidth coefficients obtained for the same transitions as 1.00 +/- 0.03 and 1.06 +/- 0.04, respectively. The measured pressure shift coefficients were predominantly negative, and the mean and standard deviation values for air-, nitrogen-, and oxygen-broadened shifts were -0.0067 +/- 0.0032, -0.0068 +/- 0.0041, and -0.0066 +/- 0.0028 cm(-1) atm(-1), respectively. Comparisons are made with the results obtained for similar transitions in the v(3) band of (12)CH(4) and the v(4) band of (13)CH(4).
利用傅里叶变换光谱仪在0.01 cm⁻¹分辨率下记录的室温红外实验室吸收光谱，测量了¹³CH₄在3μm处v(3)基频带中75多个单独振动 - 转动跃迁的空气、氮气和氧气加宽半高宽以及压力诱导线移系数。使用非线性最小二乘曲线拟合技术，假设为洛伦兹线型，对P支中J" = 13及以内和R支中J" = 7及以内的跃迁进行了分析。通过分析，我们确定了相同跃迁的空气加宽与氮气加宽半高宽系数之比以及空气加宽与氧气加宽半高宽系数之比的平均值，分别为1.00±0.03和1.06±0.04。测量得到的压力移系数主要为负，空气、氮气和氧气加宽的压力移的平均值和标准偏差值分别为-0.0067±0.0032、-0.0068±0.0041和-0.0066±0.0028 cm⁻¹ atm⁻¹。并与¹²CH₄的v(3)带和¹³CH₄的v(4)带中类似跃迁的结果进行了比较。
