スパークイオン源固体質量分析における乾板によるイオン量測定精度の検討

概要

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The correct emulsion characteristic curve was constructed by plotting isotopic abundance against Seidel function obtained from the isotopic lines of Sn+;spectra taken on a single plate at three different exposures, (Fig. 1). The monitor current during the exposure was always kept below 1×10-13A which had been found necessary in our laboratory to avoid the broading of spectral lines, a condition essential to construct a correct characteristic curve. It is to be noted in this connection that a certain microphotometer gave a false result that the line width at half intensity decreased with density though in fact it remained constant. Employing the characteristic curve thus obtained, constancy of ion quantity and exactness isotopic abundance measurement were examined by the use of a number of zinc or carbon spectra taken all over a single Ilford Q 2 plate both by changing magnetic filed strength and by vertically displacing the plate, (Fig. 1). All these spectra were taken at constant exposure by keeping the monitor current below 1×10-13A. Results. The ion quantities* obtained of zinc and carbon isotopes were found constant within ±5 percent. The isotopic abundance of zinc was exact within ±2 percent absolute. *Here ion quantity means a quantity proportional to the number of ions that have arrived at the line position.
日本質量分析学会の論文