Nadezhdinskii A I, Ponurovskii Ya Ya
Natural Sciences Center of A.M. Prokhorov General Physics Institute, Vavilov Street 38, 119991 Moscow, Russia.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Apr;66(4-5):807-10. doi: 10.1016/j.saa.2006.10.040. Epub 2006 Oct 27.
Highly accurate measurements of pressure shift and broadening parameters of acetylene absorption lines in the region 6580-6600 cm-1 have been performed by tunable diode laser spectroscopy (TDLS). For these purposes the three channel spectrometer with distributed-feedback diode laser, operated at 1.53 microm was used. The laser is generating pulses of 4-10 ms duration at a repetition frequency of 40 Hz. A temperature-stabilization system, using a thermoelectric cooling unit affords a temperature stability of the order of 10(-4)K in the temperature range from -15 to +50 degrees C. A three channels acquisition system ensured simultaneous real time recording of the sample gas absorption spectrum and of two spectral calibration signals (Fabry-Perot fringes and low-pressure reference lines). We have measured the pressure-induced self-shift and broadening coefficients for six lines of the R-branch in the nu1+nu3 rotation-vibration band of acetylene 12C2H2. The self-shift coefficients have been determined for these lines in the wide pressure region. A non-linear behavior of the pressure dependence of the shift was observed. The temperature exponent n of pressure-induced broadening and shift are reported.
利用可调谐二极管激光光谱技术（TDLS）对乙炔在6580 - 6600 cm-1区域吸收线的压力位移和展宽参数进行了高精度测量。为此，使用了工作波长为1.53微米的分布反馈二极管激光三通道光谱仪。该激光以40 Hz的重复频率产生持续时间为4 - 10 ms的脉冲。采用热电冷却单元的温度稳定系统在-15至+50摄氏度的温度范围内提供约10^(-4)K的温度稳定性。三通道采集系统确保同时实时记录样品气体吸收光谱以及两个光谱校准信号（法布里 - 珀罗条纹和低压参考线）。我们测量了乙炔12C2H2的ν1+ν3转动 - 振动带中R支六条谱线的压力诱导自位移和展宽系数。已在宽压力区域确定了这些谱线的自位移系数。观察到位移的压力依赖性呈现非线性行为。报告了压力诱导展宽和位移的温度指数n。
