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A LINEAR RADIO-FREQUENCY MASS SPECTROMETER

1952; NRC Research Press; Volume: 30; Issue: 1 Linguagem: Inglês

10.1139/p52-001

1208-6045

P. A. Redhead,

Plasma Diagnostics and Applications

A radio-frequency mass spectrometer is described using a system of electrodes similar to a linear accelerator to obtain velocity selection of tin ions. A beam of ions is directed through a series of axial radio-frequency fields with alternate polarity, and the ion with a velocity (proportional to [Formula: see text]) such that it traverses the individual stages in approximately one-half period of the radio-frequency field, acquires maximum energy from this field. A retarding field region prevents all ions, except the ion with maximum energy, from reaching the collector. An ion beam of large cross section is used. With 20 radio-frequency stages a mass resolution of 1% is obtained.