Positron lifetime measurements of Hg0.8Cd0.2Te furnished direct evidence for the presence of monovacancies in samples which had been annealed in a Hg atmosphere. An unique lifetime of 309ps was detected and was attributed to a monovacancy; possibly a doubly-ionized Hg vacancy.

C.Gély, C.Corbel, R.Triboulet: Journal of Physics - Condensed Matter, 1990, 2[21], 4763-7