Use of an off-axis ion path for background reduction of an...

Details Use of an off-axis ion path for background reduction of an... Use of an off-axis ion path for background reduction of an...

H - Electricity

01

J

H01J 49/36 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2206557

A mass spectrometer apparatus is adapted to separate desired from unwanted ions. It has the elements of the apparatus divided into first and second groups of elements, each of which groups include at least one element, wherein the first group of elements is located on a first upstream axis and the second group of elements is located on a second downstream axis, which first and second axes are inclined at an angle to one another, the angle being such that at least a portion of the desired ions travel from the first axis to the second axis, and that the unwanted ions substantially fail to traverse from the first axis to the second axis. The first group can include the ion source, the inlet plate and elements for directing the ions into the spectrometer. The second group of elements can includes a vacuum chamber, a first rod set and an interface plate at the outlet of the vacuum chamber, so that the angle between the two axis portions is provided at the inlet to the rod set.

Spectromètre de masse adapté pour séparer les ions recherchés des ions indésirables. Les éléments de l'appareil sont divisés en un premier et en un second groupe d'éléments, chacun de ces groupes comprenant au moins un élément; le premier groupe d'éléments est situé sur un premier axe en aval, et le second sur un deuxième axe en aval; le premier et le second axes sont inclinés suivant un angle l'un par rapport à l'autre; cet angle fait en sorte qu'au moins une partie des ions recherchés se déplacent du premier au second axe. Le premier groupe peut comprendre la source d'ions, la plaque d'entrée et les éléments permettant de guider les ions dans le spectromètre. Le second groupe d'éléments peut comprendre une chambre à vide, un premier système de tiges et une plaque d'interface à la sortie de la chambre à vide, de telle façon que l'angle entre les deux portions d'axes soit formé à l'entrée du système de tiges.

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