Oxides and oxyions of the non-metals. Part XII. An electron spin resonance spectroscopic study of the chlorate anion centre in irradiated barium sulphate

Abstract

A radical prepared by the action of γ-rays on barium sulphate doped with perchlorate anions has been detected by e.s.r. spectroscopy. The principal values of the g-tensor are g₁₁= 2·0020, g₂₂= 2·0255, and g₃₃= 2·0325, and those of the ³⁵Cl hyperfine tensor are A₁₁= 74·6, A₂₂= 77·5, and A₃₂= 71·7 G. The structure of the centre is discussed and by comparison with the radicals PF₄, PCI₄, SF₄⁺, and AsO₄^4–, it is concluded that this species is the isoelectronic ClO₄^2– radical.