Search International and National Patent Collections

1. (WO2010116396) ION TRAP DEVICE

Pub. No.:    WO/2010/116396    International Application No.:    PCT/JP2009/001442
Publication Date: Fri Oct 15 01:59:59 CEST 2010 International Filing Date: Tue Mar 31 01:59:59 CEST 2009
IPC: H01J 49/42
G01N 27/62
Applicants: Shimadzu Corporation
株式会社島津製作所
KODERA, Kei
小寺慶
HAZAMA, Makoto
狭間一
IWAMOTO, Shinichi
岩本慎一
SEKIYA, Sadanori
関谷禎規
Inventors: KODERA, Kei
小寺慶
HAZAMA, Makoto
狭間一
IWAMOTO, Shinichi
岩本慎一
SEKIYA, Sadanori
関谷禎規
Title: ION TRAP DEVICE
Abstract:
Ions supplied in the form of a pulse are introduced into an ion trap (10) through an ion entering orifice (15) while a rectangular voltage of a frequency higher than the frequency at which the best trap is accomplished is applied to a ring electrode (11) from a trap voltage generating unit (32). With this, since a well of a virtual ion potential is formed in a radial direction in the ion trap (10), the spread of ions of low m/z values introduced previously is suppressed. A part of ions is introduced into the ion trap (10), and thereafter the frequency of the rectangular voltage applied to the ring electrode (11) is lowered stepwise to the frequency at which the best trap is accomplished. As a result, the ions of the low m/z values introduced previously can be efficiently trapped, and introduction of ions of high m/z values reaching the ion trap (10) later is not hindered. Consequently, ions of a wide range of m/z values can be trapped in the ion trap (10) with high efficiency.