Patent ID: 9406494
Filing Date: 2016-08-02
CPC Classification: H01J

Claim Text:
1. A Time of Flight mass analyser comprising: one or more acceleration electrodes; and a first device arranged and adapted to apply a DC voltage pulse to said one or more acceleration electrodes, wherein said DC voltage pulse causes ions to be accelerated into a time of flight or drift region and wherein said DC voltage pulse is applied, in use, to said one or more acceleration electrodes between a time T wherein said Time of Flight mass analyser further comprises: a second device arranged and adapted to apply a single phase oscillating voltage to said one or more acceleration electrodes, wherein said single phase oscillating voltage undergoes multiple oscillations between said time T wherein the application of said DC voltage pulse and said single phase oscillating voltage to said one or more acceleration electrodes establishes a substantially homogeneous electric field having a net force towards said time of flight or drift region.