Pressure-induced shift and broadening of acetylene lines in the region 6580-6600 cm-1.
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.
Nadezhdinskii
A I
AI
Natural Sciences Center of A.M. Prokhorov General Physics Institute, Vavilov Street 38, 119991 Moscow, Russia.
Ponurovskii
Ya Ya
YY
D000114:Acetylene / Q000737:chemistry*; D007834:Lasers; D011312:Pressure; D013057:Spectrum Analysis; D013696:Temperature; D013997:Time Factors
D000114:Acetylene