High-efficiency Thermal Ionization Sources for Mass Spectrometry

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  • High-efficiency Thermal Ionization Sources for Mass Spectrometry Book Detail

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  • Release Date : 1996
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  • Pages : 17
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  • File Size : 12,12 MB
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High-efficiency Thermal Ionization Sources for Mass Spectrometry by PDF Summary

Book Description: Thermal ionization mass spectrometry (TIMS) is one of the most powerful techniques used to determine, both, the absolute and the relative isotopic abundance of elements. Thermal ionization is efficient for elements which have relatively low or moderate first ionization energies, and with sufficient vapor pressure at the source operating temperature. Although TIMS is a very sensitive technique, sample utilization efficiency is usually limited in conventional ion sources. For example, the traditional flat ribbon-type filament thermal ionization sources commonly have sample utilization efficiency of less than 0.2% for uranium. Thus, techniques that enhance the ionization efficiency for TIMS have been widely explored. In the early 1970s, a new type of thermal ionization source was developed by Beyer et al. and by Johnson et al., in which a refractory metal tube resembling a crucible with a deep cavity was used instead of a filament to evaporate and ionize the samples. The crucible was heated to ionizing temperatures, up to 3000 C, by high energy electron impact from a heated filament surrounding the crucible. In this way, the thermal temperature of the sources and the atom-surface interactions can be significantly increased. Therefore, considerably improving the sample ionization efficiency.

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