The theory of thermal ionization mass spectrometry has been deeply discussed and the procedures for high-precision measurement of isotopes of lithium, indium and cerium have been established.
该成果对质谱中的热电离理论进行了较深入地讨论，建立了高精度质谱测定锂铟铈同位素的方法。
The most dramatic effect would have been on the formation of lithium, an element that has two isotopes.
效果最为强烈的便是锂元素的形成，这种元素有两种同位素。
If so, the grains would contain a wide variety of isotopes from elements heavier than lithium.
假如如此，尘烬里就会包含诸多种类的比锂重的元素的同位素。
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