Patent ID: 6075243
Filing Date: 2000-06-13
Classification: H01J

Abstract:
An ion trap mass spectrometer provided with an ion trap mass analysis region comprising: two endcap electrodes disposed so as to be opposite to each other; one ring electrode disposed so as to enclose a space between said endcap electrodes; an input hole formed in one of said two endcap electrodes for inputting particles from outside of said three electrodes into said space surrounded by said three electrodes; a first output hole formed in another one of said two endcap electrodes for outputting particles which are not analyzed; and a second output hole formed in one of said two endcap electrodes for outputting ions to outside of said three electrodes from said space surrounded by said three electrodes so that ions are reserved in said space surrounded by said three electrodes for a predetermined time by using a high-frequency electric field, analyzed on the basis of a mass-to-charge ratio, and then outputted to the outside of said three electrodes through said second output hole, wherein said second output hole for detection of ions is present on a center axis of said endcap electrodes; andwherein, in said ion trap mass analysis region, said input hole and said output hole are both present in one of said endcap electrodes.