Mass spectrometer ion guide providing axial field, and method

H - Electricity – 01 – J

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H01J 49/06 (2006.01) H01J 49/02 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2685791

An ion guide includes a plurality of rods, arranged about an axis that extends lengthwise from one end to the other of the guide. The rods guide ions in a guide region along and about the axis. A conductive casing surrounds the rods. The casing and the rods are geometrically arranged to produce an axial electric field along the axis. Specifically, the geometry is such that a first constant applied DC voltage (UDC), applied to the rods, and a second constant applied DC voltage (UCASE) applied to the casing, produce a voltage gradient between said casing and said axis that has a different magnitude at different positions along said axis.

Un guide d'ions comprend une pluralité de tiges disposées autour d'un axe qui s'étend longitudinalement d'une extrémité à l'autre du guide. Les tiges guident les ions dans une région de guide située le long et autour de l'axe. Un corps conducteur entoure les tiges. Le corps et les tiges sont géométriquement disposés pour produire un champ électrique axial le long de l'axe. De manière spécifique, la géométrie est telle qu'une première tension continue appliquée de façon constante (UDC) appliquée aux tiges, et qu'une seconde tension continue appliquée de façon constante (UCASE) appliquée au corps produisent un gradient de tension entre ledit corps et ledit axe présente une valeur différente à différent endroits le long dudit axe.

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