The mononuclear @H02904@ AsH5, systematically named \(\lambda ^{5}\)-arsane, and its hydrocarbyl derivatives. By extension the term also applies to arsonium @Y06728@.
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1320 [Terms] [Paper]