Stable isotopes of chlorine are often used as tracers in the study of the chemical reactions of chlorine and its compounds. In these studies, as well as in the control of processes for separation of chlorine isotopes, one needs methods for precise determination of the isotopic composition of chlorine.
K. F. Zmbov, "Mass Spectrometric Isotopic Analysis of Chlorine by the Surface-lonization Method," Appl. Spectrosc. 22, 576-578 (1968)