| Detectors for Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometer |
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1 Koichi Tanaka Mass Spectrometry Research Laboratory, Shimadzu Corporation, Kyoto, JAPAN 2 Biosignal Research Center, Organization of Advanced Science and Technology, Kobe University, Kobe, JAPAN 3 The Graduate School for the Creation of New Photonics Industries, Hamamatsu, JAPAN 4 Electron Tube Division, Hamamatsu Photonics K. K., Hamamatsu, JAPAN 5 Research Institute of Instrumentation Frontier (RIIF), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, IBARAKI, JAPAN |
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| In general, microchannel plate (MCP) is used as the detector for time-of-flight mass spectrometer (TOF-MS). In addition to the MCP, TOF-MS equipped with modified secondary electron multiplier (SEM) is commercially available. A superconducting tunnel junction (STJ) detector, which enables measurement of kinetic energy in addition to time-of-flight, has been developed for TOF-MS. MCP and SEM detectors give only m/z values, which remains ambiguous over charge number (z). Since kinetic energy is proportional to z, TOF-MS equipped with STJ detector is possible to determine mass (m) unambiguously. In this commentary, the features of MCP and modified SEM will be described. Furthermore, we give an outline of the STJ detector. | ||
| Key words: Microchannel plate, Time-of-flight mass spectrometer, Matrix-assisted laser desorption/ionization, Superconducting tunnel junction detector, Secondary electron multiplier | ||
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