Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
51 巻, 2 号
選択された号の論文の6件中1~6を表示しています
報文
  • Daisuke OKUMURA, Michisato TOYODA, Morio ISHIHARA, Itsuo KATAKUSE
    2003 年 51 巻 2 号 p. 349-353
    発行日: 2003年
    公開日: 2007/10/16
    ジャーナル フリー
    A new multi-turn time-of-flight mass spectrometer ‘MULTUM II’ was constructed. The ion optical system was simplified comparing with ‘MULTUM Linear plus’. The multi-turn part of the new instruments consisted of only four toroidal electric sector fields. The mean radius of cylindrical electric sector was 50 mm and the deflection angle was 157.1°. The total flight pass length of one cycle was 1.308 m. In a preliminary experiment, the mass spectra of Xe ion were measured and enhancement in mass resolution with increasing number of cycles was obserbed. The mass resolution 5100 at m/z 136 was achieved after 10 cycles.
  • Takaya SATOH, Hiroyuki ITO, Hiroki SAKAE, Toshio ICHIHARA, Itsuo KATAK ...
    2003 年 51 巻 2 号 p. 354-358
    発行日: 2003年
    公開日: 2007/10/16
    ジャーナル フリー
    The lifetime distribution of silver and mercury-silver binary cluster ions from a sputtering ion source was investigated. The cluster ions were produced by 10 keV Xe ion bombardment on a mercury-silver amalgam for mercury-silver binary clusters, and a silver plate for silver clusters. The fragmentation rates were obtained from experimental data at several positions of the mass spectrometer. The lifetime distribution was calculated using fragmentation rates. The distribution was found to be rather power functional than exponential, because of the wide distribution of lifetimes for cluster ions. The cluster ion, Hg12Ag+, which might have an icosahedron structure turned out to be more stable than neighboring clusters.
  • Yutaka TAKAHASHI, Fukiko HASEGAWA, Chinatsu TANAKA, Yuko HIROI, Susumu ...
    2003 年 51 巻 2 号 p. 359-364
    発行日: 2003年
    公開日: 2007/10/16
    ジャーナル フリー
    The characterization and metastable decomposition of isobaric ions from several compounds are described by using high-resolution mass spectrometry (HR-MS) and mass-analyzed ion kinetic energy (MIKE) spectrometry. The m/z 45 ions from 2-methoxyethylamine, CH3OCH2CH2NH2 (1) consists of two isobaric ions, methoxymethyl ion, CH3OCH2+, and C2H7N+ ion. The former decomposes into the m/z 29 ion by losing CH4 in metastable time window. Although the latter decomposes into the m/z 30 and 18 ions, its structure could not be confirmed in this study. The m/z 69 ions generated from methyl trifluoroacetoacetate, CF3COCH2COOCH3 (2) and 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, CF3COCH2COCF3 (3) also consists of two isobaric ions, trifluoromethyl ion, CF3+, and protonated carbon suboxide, OCCHCO+. The former does not decompose into any ions in the metastable time window. On the other hand, the latter decomposes into m/z 41 ion by losing CO.
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