Abstract

A reliable method for detecting and recording very small ion beam currents is described. A twenty-stage electron multiplier is used in conjunction with scalers and other circuitry for counting individual positive ions. Advantages and limitations of this method, as applied to mass spectrometer problems, are discussed.

Photon Counting

G. A. Morton
Appl. Opt. 7(1) 1-10 (1968)

Measurement of the isotope selectivity of the strontium magneto-optical trap by a time-of-flight mass spectrometer

Kwang-Hoon Ko, You-Kyoung Lim, Do-Young Jeong, Hyunmin Park, Taek-Soo Kim, Gwon Lim, and Hyung Ki Cha
J. Opt. Soc. Am. B 23(12) 2465-2469 (2006)

Multiplier Photo-Tube Characteristics: Application to Low Light Levels*

Ralph W. Engstrom
J. Opt. Soc. Am. 37(6) 420-431 (1947)

Double optical resonance mass selective detection of aromatic molecules in a supersonic molecular beam

Jack A. Syage and John E. Wessel
Appl. Opt. 26(17) 3573-3578 (1987)

A Comparison of Photon Counting and Current Measuring Techniques in Spectrophotometry of Faint Sources

Robert G. Tull
Appl. Opt. 7(10) 2023-2029 (1968)