Surface Stochiometrie and Carbon Distribution in Mercuric Iodide by Ion Analysis

Abstract

Mercuric Iodide (Hgl₂) is a promising material for X-ray spectrometers, however, very poor performance reproductlbillty are achieved today. Stoichiometrie deviations, Impurities may play an important role. Using RBS of ⁴He⁺ Ions the stoichiometry of the first hundreds of A was determined as a function of crystal growth conditions and chemical etching. Strong deviations have been observed ranging from ${{{{\rm{N}}_{\rm{1}}}} \over {{{\rm{N}}_{\rm{H}}}}}$ = 2.07 to 2.42 (± 0.05). Furthermore, the carbon distribution was obtained by the ¹²C (d, p) ¹³C nuclear resonant reaction; the concentration ranged between 100–500 ppm depending of starting material purification.