In this paper,we report the photoionization and photodissociative ionization processes of azobenzene(PHAB) using vacuum ultraviolet synchrotron radiation(SR) photoionization mass spectroscopy.The ionization potential(IP) of the PHAB molecular and the apparant potential(AP) of the main ionic fragments from the SR photodissociative ionization of PHAB have been measured.On the basis of IP(C 12 H 10 N 2O) and AP measured in this experiment,dissociative energy D 0(OHC 6H 4N 2-C 6H 5),D 0(OHC 6H 4N 2-C 6H + 5),D 0(OHC 6H 4N + 2-C 6H 5),D 0(OHC 6H 4-N 2C 6H 5),D 0(OHC 6H 4-N 2C 6H + 5) and IP(C 6H 4N 2O) have been evaluated.Based on the results of the mass spectroscopy of PHAB,possible channel of the photodissociative ionization of PHAB was analyzed.
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