CF3I MULTIPHOTON DISSOCIATION UNDER THE INTENSE IR FIELD

Using TEA CO2 laser 9.6R (14) line as excitation source, Fourier transformation IR spectrometer as measuring instrument, NO and O-2 as scavenger of CF3 radical, we have studied the dynamics of multiphoton dissociation of CF3I. It was found that O-2 and NO can both be used to trap thhe CF3 radical resulted from IR multiphoton dissociation of CF3I. From the investigation of the dependence of the IR MPD yield of CF3I and the buffer gas pressure and from the measurement of multiphoton absorption of CF3I, small molecule character was found for CF3I when it was excited by IR laser. It was observed that buffer gases can reduce the early bottleneck effect. An energy grained master equation was used to simulate the dependence of MPD yield of CF3I and laser fluence under collisionless and early bottleneck effect neglectable condition. The calculated value is in agreement with thhe experimental data.