The arsanyl cation,
H2As+, and derivatives by substitution. The name arsinylium (systematically derived from arsine) is not applied as it already designates
H2As(=O)+, the acylium ion derived from arsinic acid.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1319 (https://doi.org/10.1351/pac199567081307)