Title (en)

METHOD FOR THE MASSSPECTROMETRIC ANALYSIS OF A GAS MIXTURE, AND MASS SPRECTROMETER FOR CARRYING OUT THE METHOD

Publication

EP 0321819 A3 19890823 (DE)

Application

EP 88120710 A 19881212

Priority

DE 3743718 A 19871223

Abstract (en)

[origin: EP0321819A2] For the mass spectrometric analysis of gas mixtures, use is made of a mass spectrometer having a quistor in which ions of the gas mixture whose charge/mass ratio is in a prescribed range are stored owing to the generation of an electromagnetic field. By changing the field parameters, the ions are successively forced to leave the ion trap. In this process, the intensity of the ionic current leaving the ion trap is measured as a function of the change in field parameters. In order to improve the resolution, use is made of a quistor in which the ratio Q of the radii of the inscribed electrode apex circles to the distance satisfies the condition Q </= 3.990, where <IMAGE> where Re = radius of the apex cross-section of the end electrodes (3, 5), Rr = radius of the apex cross-section of the annular electrode (4), z0 = distance of the apex of the end electrodes (3, 5) from the centre of the quistor and r0 = distance of the apex of the annular electrode (4) from the centre of the quistor. <IMAGE>

IPC 1-7

H01J 49/38; H01J 49/42

IPC 8 full level

H01J 49/10 (2006.01); H01J 49/38 (2006.01); H01J 49/42 (2006.01)

CPC (source: EP US)

H01J 49/424 (2013.01 - EP US); H01J 49/429 (2013.01 - EP US)

Citation (search report)

• [AD] EP 0113207 A2 19840711 - FINNIGAN CORP [US]
• [A] EP 0202943 A2 19861126 - FINNIGAN CORP [US]

Designated contracting state (EPC)

CH DE FR GB LI SE

DOCDB simple family (publication)

EP 0321819 A2 19890628; EP 0321819 A3 19890823; EP 0321819 B1 19930421; EP 0321819 B2 20020619; DE 3880456 D1 19930527; US 5028777 A 19910702

DOCDB simple family (application)

EP 88120710 A 19881212; DE 3880456 T 19881212; US 28574188 A 19881216