Spectrometric Studies of Selected Nitrocompounds Using Laser-InducedPhotofragmentation/Photoionization at 193 nm

摘要

A new method for detection trace vapors of NO2 containing compounds nearatmospheric conditions has been demonstrated using one color laser photofragmentation/fragment ionization spectrometry. An ArF laser is employed to both photolytically fragment the target molecules in a collision-free environment and ionize the characteristic NO fragments. The production of NO is hypothesized to result from a combination of two NO2 unimolecular fragmentation pathways, one yielding NO in its X(2)Pi electronic ground state and the other in its A(2)Sigma+ excited state. Ionization of ground state NO molecules is accomplished by resonance-enhanced multiphoton ionization processes via their A(2)Sigma <-X(2)Pi