Multi-reflection mass spectrometer

An electrostatic trap mass spectrometer comprising two or more multi-reflection mass spectrometers, each multi-reflection mass spectrometer including two ion-optical mirrors, each mirror elongated generally along a drift direction (Y), each mirror opposing the other in an X direction, the X direction being orthogonal to wherein the mirrors are not a constant distance from each other in the X direction along, at least a portion of their lengths in the drift direction.

A composite mass spectrometer comprising two or more multi-reflection mass spectrometers each multireflection mass spectrometer including two ion-optical mirrors, each mirror elongated generally along a drift direction (Y), each mirror opposing the other in an X direction, the X direction being orthogonal to Y, wherein the mirrors are not a constant distance from each other in the X direction along at least a portion of their lengths in the drift direction, the multi-reflection mass spectrometers being aligned so that the X-Y planes of each mass spectrometer are parallel and optionally displaced from one another in a perpendicular direction Z, the composite mass spectrometer further comprising ion-optical means to direct ions from one multi-reflection mass spectrometer to another.

A method of mass spectrometry comprising the steps of injecting ions into a multi-reflection mass spectrometer comprising two ion-optical mirrors, each mirror elongated generally along a drift direction (Y), each mirror opposing the other in an X direction, the X direction being orthogonal to Y, wherein the mirrors are not a constant distance from each other in the X direction along at least a portion of their lengths in the drift direction;

• and detecting at least some of the ions during or after their passage through the mass spectrometer.

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An ion optical arrangement comprising two ion-optical mirrors, each mirror elongated generally along a drift direction (Y), each mirror opposing the other in an X direction and having a space therebetween, the X direction being orthogonal to Y, characterized in that the mirrors are not a constant distance from each other in the X direction along at least a portion of their lengths in the drift direction.

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