Threshold Photoelectron-photoion Coincidence Imaging Study Of Dissociation Dynamic Of No~+ At C ~3Π (v'=0) State

The author participated the development of the new apparatus of threshold photoelectron-photoion coincidence imaging(TPEPICO-imaging), and the dissociation dynamics of NO+ at c 3Π(v'=0)state produced through the ionization of NO molecules was studied using this apparatus. The relations between velocity in center of mass (CM) coordinates and most probable center of mass (MPCM) coordinates, time of flight (TOF) and displacement in the velocity map image of fragment ions are derived using vector addition of velocity and displacement on the condition of perpendicular molecular beam (MB). Using these relations the velocity in CM coordinates, the velocity and angular distribution of N+ fragment ions in MPCM coordinates are obtained and discussed, respectively.There are three chapters. In chapter one, which is introduction, describes some knowledge and concepts about the ion imaging, photoionizaiton and photodissociation of molecules etc in brief, respectively. In chapter two, experimental apparatus, the structure and power of the atomic and molecular beamline(U14-A) and TPEPICO-imaging apparatus are introduced, in addition to some knowledge about synchrotron radiation.In chapter three, the dissociation dynamics of NO+ at c 3Π(v'=0) state is studied by the TPEPICO-imaging technique. The relations between velocity in CM coordinates and MPCM coordinates, TOF and displacement in the velocity map image of fragment ions are derived using vector addition of velocity and displacement on the condition of perpendicular MB. Using these relations the velocity in CM coordinates, the velocity and angular distribution of N+ fragment ions in MPCM coordinates are obtained and discussed, respectively.