Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Volume 55, Issue 6
Displaying 1-5 of 5 articles from this issue
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REGULAR PAPERS
  • Construction of a Palmtop Size Multi-Turn Time-of-Flight Mass Spectrometer “MULTUM-S”
    Toshio ICHIHARA, Satoshi UCHIDA, Morio ISHIHARA, Itsuo KATAKUSE, Michi ...
    2007 Volume 55 Issue 6 Pages 363-368
    Published: 2007
    Released on J-STAGE: December 15, 2007
    DOIhttps://doi.org/10.5702/massspec.55.363
    JOURNAL FREE ACCESS
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    A small multi-turn time-of-flight (TOF) mass spectrometer “MULTUM-S” was constructed, whose basic ion optical design was half that of the multi-turn TOF mass spectrometer “MULTUM II,” which consists of four toroidal electric sectors. Two additional electric sectors were introduced to inject and eject ions. The size of the analyzer was 20×20 cm. It was demonstrated that the mass resolution increased with the number of ion cycles in the multi-turn part, and a resolution of 4800 was obtained for electron ionization (EI), which generated xenon ions after 11 cycles.
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  • Development of a Two-Dimensional Mass Spectrometer Using an Axially Resonant Excitation Linear Ion Trap
    Yuichiro HASHIMOTO, Masuyuki SUGIYAMA, Hideki HASEGAWA
    2007 Volume 55 Issue 6 Pages 369-374
    Published: 2007
    Released on J-STAGE: December 15, 2007
    DOIhttps://doi.org/10.5702/massspec.55.369
    JOURNAL FREE ACCESS
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    We performed a preliminary study on two-dimensional mass spectrometry (1st dimension, precursor ion's m/z; 2nd dimension, fragment ion's m/z) using an axially resonant excitation linear ion trap (AREX LIT) as the source ion trap. The spectrometer, consisting of a source ion trap with mass selectivity, a collision cell, and mass analyzer, is expected to have a duty cycle over 40 times that of conventional tandem mass spectrometers. Because the AREX LIT can eject ions with an efficiency of over 70% and energy dispersion of only a few electron volts, it can obtain a 2D mass spectrum with a good S/N in only 1 s.
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NOTE
  • Error Paradox in the Radiogenic Age Determination
    Jun-ichi MATSUDA
    2007 Volume 55 Issue 6 Pages 375-377
    Published: 2007
    Released on J-STAGE: December 15, 2007
    DOIhttps://doi.org/10.5702/massspec.55.375
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    The relative error in the determined radiogenic age is less than the relative error in the measured amount of a decay product, which always occurs in age determination experiments. This can be confirmed by calculating the error for the case when there is an error in the measured amount of the decay product while there is no (or negligible) error in the measured amount of the decay precursor at the present time. This is a paradox because the relative error in the radiogenic age would always be larger than that in the measured amount of the decay product, when we assume that there was no (or negligible) error in the initial amount of the decay precursor.
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TECHNICAL REPORT
  • The Effect of the Collector in the Precise Measurement of Argon Isotopic Ratios
    Chie MIYAKAWA, Takuya MATSUMOTO, Jun-ichi MATSUDA
    2007 Volume 55 Issue 6 Pages 378-380
    Published: 2007
    Released on J-STAGE: December 15, 2007
    DOIhttps://doi.org/10.5702/massspec.55.378
    JOURNAL FREE ACCESS
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    In Ar isotopic measurement by mass spectrometry, the Faraday cup detector for the 40Ar signal, and the Daly knob or ion counting system with an electron multiplier for 36Ar and 38Ar signals are used. This is because the signal intensities of the 36Ar and 38Ar are much lower than that of 40Ar, and the Daly knob and electron multiplier are more sensitive than the Faraday cup. In our laboratory, we predominantly use the Faraday cup detector for the 40Ar signal and the ion counting system with an electron multiplier for the 36Ar and 38Ar signals, for Ar isotopic measurement. However, we found that the discrimination factors for the 40Ar/36Ar ratios become constant over the wide range of 36Ar gas amounts and that the 40Ar/36Ar ratio can be determined with better precision when the Faraday cup was used to detect both the 40Ar and 36Ar signals.
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Letter from the Editor-in-Chief
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