Quasi-continuous operation of an IF(B–X) laser involving levels populated as a result ofVTrelaxation

Rotational effects on the overtone-induced isomerization rate for CHD2NC .fwdarw. CHD2CN

“…The temperature was maintained to within 0.6 °C, using an Omega 9000 temperature controller with a type J thermocouple sensor, but the accuracy of the temperature is only ±2 °C. The cell was heated using about 12 V ac through 0.4-mm-diameter nichrome wire wrapped around the body of the cell in a spiral of approximately 0.5-cm spacing. The low voltage, which was slightly more than enough to maintain the desired temperature, prevented formation of hot spots in the cell, which might have caused a thermally induced background reaction.…”

“…These variations are somewhat smaller than those observed experimentally. The bandwidth of 0.01 cm"1 is the minimum spectroscopic bandwidth possible for a 6-Torr sample of this molecule on the basis of the pressure broadening of approximately 1 cm"1/atm observed in high-resolution fundamental spectra.31 At this narrow bandwidth, only [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] transitions contribute to the excited-state population. These calculations suggest that even significant variation of the excited distribution (major errors in the simulation) is unlikely to account for the discrepancy between calculations and experimental data.…”