Abstract: Using TEA CO_2 laser 9.6R (14) line as excitation source, Fourier transforma tion IR spectrometer as measuring instrument, NO and O_2 as scavenger of CF_3 ra dical, we have studied the dynamics of multiphotoa dissociation of CF_3I.
It was found that O_2 and NO can both be used to trap the CF_3 radical resul ted from IR multiphoton dissociation of CF_3I. From the investigation of the de pendence of the IR MPD yield of CF_3I and the buffer gas pressure and from the measurement of multiphoton absorption of CF_3I, small molecule character was found for CF_3I 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 CF_3I and laser fluence under collisionless and early bottleneck effect neglectable condition. The calculated value is in agreement with the experimental data.