Arsenic and sulfur were placed in two different tubes and turbomolecular vacuum (10-6 Torr was used to exclude water and oxygen. During vacuum, arsenic was heated at 290 °C for 2 h to remove
Arsenic and sulfurwere placed in two different tubes and turbomolecular vacuum (10-6 Torr was used to excludewater and oxygen. During vacuum, arsenic was heated at 290 °C for 2 h to remove