Collision cell

Patent metadata

Field	Value
Publication number	US-9117639-B2
Application number	US-201514625439-A
Country	US
Kind code	B2
Filing date	Feb 18, 2015
Priority date	Jun 3, 2008
Publication date	Aug 25, 2015
Grant date	Aug 25, 2015

Abstract

A method of operating a gas-filled collision cell in a mass spectrometer is provided. The collision cell has a longitudinal axis. Ions are caused to enter the collision cell. A trapping field is generated within the collision cell so as to trap the ions within a trapping volume of the collision cell, the trapping volume being defined by the trapping field and extending along the longitudinal axis. Trapped ions are processed in the collision cell and a DC potential gradient is provided, using an electrode arrangement, resulting in a non-zero electric field at all points along the axial length of the trapping volume so as to cause processed ions to exit the collision cell. The electric field along the axial length of the trapping volume has a standard deviation that is no greater than its mean value.

First claim

The invention claimed is:

1. A method of operating a gas-filled collision cell in a mass spectrometer, the collision cell having a longitudinal axis, the method comprising:
switching operation of the collision cell between a first mode and a second mode;
wherein the operation in the first mode comprises:
causing ions to enter the collision cell;
generating a trapping field within the collision cell so as to trap the ions within a trapping volume of the collision cell, the tra…

Assignees

• Thermo Fisher Scient Bremen

Inventors

• Makarov Alexander
• Denisov Eduard V
• Balschun Wilko
• Nolting Dirk
• Griep-Raming Jens

Classifications

• H01J49/0072 Primary

  Electricity · mapped topic

• H01J49/26

  Electricity · mapped topic

• H01J49/0031 Primary

  Electricity · mapped topic

• H01J49/0481

  Electricity · mapped topic

• H01J49/4225

  Electricity · mapped topic