| 摘要 |
PROBLEM TO BE SOLVED: To provide a mass spectroscope capable of measuring two ion sources of different pressure levels by changeover. SOLUTION: Sample gas separated by a GC column 1 is branched and introduced separately into a first ion source (for instance, an APCI ion source) 2, and a second ion source (for instance, an EI ion source) 3 with a pressure level lower than the first ion source. Further, a flow volume of the sample gas introduced to the APCI ion source 2 is set more than that introduced into the EI ion source, and pressure of each ion source is maintained, whereby, analysis by each ionization is enabled to carry out with good balance in an aspect of sensitivity. COPYRIGHT: (C)2007,JPO&INPIT
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