Abstract: A Study on the Characteristics of ITD Mass SpectrometryShi Junhui; Feng Yuepeng; Zhou Chunyu; Liu Xiande; Chen Shujon (Chinese Academy of Enviromental Sciences, Beijing 100012, China)Received 1993-06-03 Abstract:The principle of ion Trap Detector (ITD) is different from that of quadrupole and magnetic mass spectrometers. Using INCOSTM library search and probabitity based matching algorithm, by comparison of ITD spectra with NBS and Wiley spectra for more than 500 organic compounds which appear as enviromental pollutants, it is found that spectra are similar for majority of them, and different to various extents for others.Possible causes of the spectral differences are discussed.Keywords: Ion Trap Spectra, probabitity based matching, library search.