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Eur. J. Mass Spectrom. 6, 523 - 530 (2000)

A quadratic-field reflectron time-of-flight mass spectrometer incorporating intermediate temporal focusing

Alex W. Colburn, A.E. Giannakopulos and Peter J. Derrick
Institute of Mass Spectrometry and Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
Markus von Raumer
Solvias AG, 4002 Basel, Switzerland

ABSTRACT:
A time-of-flight mass spectrometer, using a two-electrode cone-plus-hyperboloid geometry to produce a quadratic reflecting field, has been designed, constructed and tested. The included angle of the cone was 90°. Matrix-assisted laser desorption/ionisation and direct laser desorption/ionisation were the methods used to produce ions. Physical constraints imposed by the geometry of the ion mirror were overcome by the use of ion-bunching to form an intermediate temporal focus. Experimental and ion-optical simulation results are presented, showing the large energy-bandwidth of the quadratic-field reflectron and the effectiveness of ion-bunching as a method of producing a temporal focus at the entrance to the ion mirror.

Keywords: quadratic-field, ion mirror, reflectron, time-of-flight, ion-bunching, Simion

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