MASS SPECTROMETER

WIPO Patent Application WO/2010/150301

A1

In an ion detector, the voltages from power supplies (21 - 23) in which the voltages can be independently controlled are applied to first to fifth stage dynodes (11 - 15), a final stage dynode (16), and an anode (17) in a secondary electron multiplier tube (10). Furthermore, the signal from the anode (17) is extracted, and the signal from the fifth stage dynode (15), which has a low electron multiplier rate, is extracted. These two signals are converted in parallel to digital values, taken in by a data processing unit (34), and stored in a data storage unit (35). When the mass spectrum is created in the data processing unit (34), the two detected data for the same time are read out, and the presence or absence of signal saturation or waveform deformation is estimated from the values of one of the detected data. If there is a high risk of signal saturation, the detected data are selected based on the signals in the intermediate stages, and the level is corrected. Signal saturation caused by the application of independent voltages to the secondary electron multiplier tube (10) is not likely to occur. Even if saturation temporarily occurs, an unsaturated signal can be reflected in the mass spectrum.

IZUMI HIDEAKI (JP)

PCT/JP2009/002822

December 29, 2010

June 22, 2009

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SHIMADZU CORP (JP)
IZUMI HIDEAKI (JP)

H01J43/30; H01J49/06

WO2007029327A1

2007-03-15

JP2005276488A	2005-10-06
JPS55137654A	1980-10-27
JP2000357487A	2000-12-26
JP2000357487A	2000-12-26

KOBAYASI, Ryohei et al. (JP)
Ryohei Kobayashi (JP)

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