Abstract

A tetrahedral MCl₄ type molecule in which M is isotopically pure and Cl is in natural abundance consists of five isotopic species due to the mixing of the ³⁵Cl (75.4%) and ³⁷Cl (24.6%) isotopes. Table I lists their symmetry, percent natural abundances, and symmetry species of infrared active modes corresponding to the <i>v</i>₃ vibration of the T_d molecule. The <i>v</i>₃ bands of CCl₄ and ²⁸SiCl₄ in argon matrices exhibit "five-peak chlorine isotope patterns" due to overlap of the nine bands listed in Table I. The vertical lines shown in Fig. 1A' indicate such a pattern for ⁷⁴GeCl₄.

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