Question

Is dempster's mass spectrometer only used to find exact masses of isotopes of solid?
or for all solids.liquids and gases?

Answer 1

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By designing mass spectrometers that can determine m/z values accurately to four decimal places, it is possible to distinguish different formulas having the same nominal mass. The table on the right illustrates this important feature, and a double-focusing high-resolution mass spectrometer easily distinguishes ions having these compositions.

Hence, it is used to find the masses of isotopes of solids, liquids and gases.