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The arsenic used (product of Laboratoires de la Vielle, Belgium)
was of semiconductor purity (5N) and was stored in sealed ampoules
until needed. The surface oxide layer was removed by sublimation
of AsO immediately before usage.
To improve purity of the sulphur (product of Lachema Brno, Czech
Republic) used in this experiment, it was distilled in house three
Triethylamine (TEA), Propylamine (PA), Dimethylsulfoxide (DMSO),
Dimethylformamide (DMF), and other solvents as Methanol and
Acetone are all products of Aldrich or Fluka Chemicals, all of
them are at least p.a. purity chemicals.