Miniature rectilinear ion trap mass spectrometry

A miniature mass spectrometry based on a rectilinear geometry ion trap (RIT) and electron ionization (EI) has been built, and its operating parameters have been optimized. The internal volume of miniature RIT is only 3.5 cm ³, and an EI was used as external ionization source. Direct leak introduction inlet systems were used for sample introduction, and the sample pressure keeps about 10^-5 Pa. Lab-made electronic components include the radio frequency (RF) scanning and amplification system, current amplifier and lens power supplies. A NI card and Labview software were employed as data acquisition and control components. Some samples such as carbon tetrachloride, tetrachloroethylene and perfluorotributylamine have been tested with some good results.