EP 0902963 B1 20020904 - AXIAL EJECTION IN A MULTIPOLE MASS SPECTROMETER
Title (en)
AXIAL EJECTION IN A MULTIPOLE MASS SPECTROMETER
Title (de)
MULTIPOLMASSENSPEKTROMETER MIT AXIALEM AUSSTOSS
Title (fr)
SPECTROMETRE DE MASSE MULTIPOLAIRE A EJECTION AXIALE
Publication
Application
Priority
- CA 9700381 W 19970602
- US 65695496 A 19960606
Abstract (en)
[origin: WO9747025A1] A method of operating a mass spectrometer having an elongated multipole rod set, in which a two-dimensional RF field radially contains trapped ions in a mass to charge range of interest, and in which the ions are contained axially by a barrier field on an end lens and to which a low voltage DC is applied. Trapped ions are axially mass selectively ejected by taking advantage of the mixing of the degrees of freedom induced by the fringing fields and other anti-harmonicities in the vicinity of the end lens. Thus, ions can be mass selectively ejected at the exit end at the same time as ions are being admitted into the entrance end of the rod set, thereby taking better advantage of the ion flux from a continuous ion source. The axial mass selective ejection is performed by applying an auxiliary AC voltage to the end lens, and by scanning either the auxiliary AC voltage or the RF voltage on the rod set. Trapped ions can be concentrated near the exit lens by applying an axial field in the direction of the lens, or can be depleted by applying the axial field in the opposite direction. The axial field can be oscillated to dissociate trapped ions.
IPC 1-7
IPC 8 full level
H01J 49/42 (2006.01)
CPC (source: EP)
H01J 49/004 (2013.01); H01J 49/4225 (2013.01); H01J 49/427 (2013.01)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
WO 9747025 A1 19971211; AU 2946197 A 19980105; AU 718774 B2 20000420; CA 2256028 A1 19971211; CA 2256028 C 20070116; DE 69715190 D1 20021010; DE 69715190 T2 20030430; EP 0902963 A1 19990324; EP 0902963 B1 20020904; JP 2000510638 A 20000815; JP 3818671 B2 20060906
DOCDB simple family (application)
CA 9700381 W 19970602; AU 2946197 A 19970602; CA 2256028 A 19970602; DE 69715190 T 19970602; EP 97923686 A 19970602; JP 53747397 A 19970602