锑的同位素丰度

1923年,Aston曾对锑同位素的丰度作了初步测量,之后Kusch等测得57.1％^(121)Sb,42.9％^(123)Sb(1937);White等测得57.25％^(121)Sb,42.75％^(123)Sb(1948);最近De Laeter等测得57.36％^(121)Sb,42.64％^(123)Sb(1988),这里％

THERMAL MICRO-REGION IONIZATION ON THIN-LAYER CHROMATOGRAPHY PLATE BY A LASER BEAM

The combined technique of gas chromatography-mass spectrometry has become mature, its ability and efficiency in organic analysis have been well known. The combined technique of liquid chromatography-mass spectrometry has been improved a great deal, but it is still developing. In principle, what the two combined techniques use is a double-separation

锑与硒的负离子质谱

迄今同位素质谱学对负离子的质谱研究很少。 锑的电子亲合能较高,有实现为热电离负离子的可能,但也并非十分容易.作者通过降低灯丝表面功函数及引入一定正离子到灯丝表面,在9mm×0.7mm×0.04mmRe敷涂灯丝上,在约4A灯丝电流下,得到分析化合物Sb_2O_3的Sbˉ,SbOˉ负离子质谱.测得天然同位素丰度比值Sb_(121/123)=1.338±0.007.由于负离子热电离选择性高,极少有杂质本底峰出现,谱图简明,这种优越性在高丰度测量中表现尤为明显。

Negative ion mass spectrometry of antimony and selenium

Because of the relatively high electron affinity of antimony, it is possible to obtain itsnegative ions by thermal ionization although it is not so easy. By means of reducing thework function on the surface of filament and introducing a kind of positive ion into