Abstract: DEP-TMS/CH_4-CI Mass Spectrometry of Metallohematoporphyrin ComplexesHuang Yunping; Zhang Wei;Chen Peiqing; Hu Yaoming; Lin Zisen(Center of Analysis and Measurement, Fudan University,Shanghai 200433,Chian)Received Abstract:Desorption chemical ionization mass spectrometry of twelve metallohematoporphyrin complexes has been investigated under DEP condition using mixture of tetramethylsilane and methane as regent gas.Much structure information is obtained on the base of the molecular ion MH+,the additive ions M+ 73+ and the pyrrolic fragment ions.Keywords:metallohematoporphyrin complexes,DEP-TMS/CH_4-CI mass spectrometry,tetramethylsilane,methane