EP 0217644 A2 19870408 - Quadrupole mass filter.
Title (en)
Quadrupole mass filter.
Title (de)
Quadrupolmassenfilter.
Title (fr)
Filtre de masse quadrupolaire.
Publication
Application
Priority
US 78251285 A 19851001
Abstract (en)
An unbalanced radio frequency voltage is supplied between two pairs of conductive rods (10a, 10c; 10b, 10d) of a quadrupole mass filter of a mass spectrometer system. Means (S2) are provided for d.c. voltage polarity reversal for monitoring positive and negative ions. The d.c. voltage is derived by rectification of the radio frequency voltage.
IPC 1-7
IPC 8 full level
G01N 27/62 (2006.01); H01J 49/42 (2006.01)
CPC (source: EP)
H01J 49/0095 (2013.01); H01J 49/4215 (2013.01)
Designated contracting state (EPC)
CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0217644 A2 19870408; EP 0217644 A3 19880316; EP 0217644 B1 19910313; CA 1263152 A 19891121; DE 3678085 D1 19910418; JP 2529219 B2 19960828; JP S62188154 A 19870817
DOCDB simple family (application)
EP 86307396 A 19860925; CA 519373 A 19860930; DE 3678085 T 19860925; JP 23426286 A 19861001