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一、引言化学元素的原子量是重要的自然常数,其测量方法由最初的化学法、相对质谱法直到目前的校正质谱法,几经改进,精确度有了显著提高。目前,国际上采用的锑原子量仍然是1921至1923年间用化学法测定的121.75±0.03。1948年,White和Cameron曾经公布了用质谱法测定的原子量121.759。因为锑是高电离电位元素,用常规的表面电离源无法实现有效的热电离,近四十年来,这一数据未能改动。
I. INTRODUCTION The atomic mass of chemical elements is an important natural constant. The measurement methods are from the initial chemical method and relative mass spectrometry until the current calibration mass spectrometry. After several improvements, the accuracy has been significantly improved. At present, the international use of antimony atomic weight is still measured by chemical method from 1921 to 1923 121.75 ± 0. 03. In 1948, White and Cameron once published mass spectrometry determination of the atomic weight 121.759. Because antimony is a highly ionizable potential element, effective thermal ionization can not be achieved with conventional surface ionization sources and this data has not been altered over the last four decades.