Positive and negative methanol cluster ions using a direct fast atom bombardment technique

✍ Scribed by Yaodong Xu; V. M. Jarvis; D. E. Bostwick; T. F. Moran

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 525 KB
• Volume: 26
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210261016

✦ Synopsis

Positive and negative cluster ions in methanol have been examined using a direct fast atom bombardment (FAB) probe technique. Positive ion (CH,OH),H+ clusters with n = 1-28 have been observed and their clusters are the dominant ions in the low-mass region. Cluster-ion reaction products (CH,OH),(H,O)H* and (CH30H),(CH30CH3)H+ are observed for a wide range of n and the abundances of these ions decrease with increasing n. The negative ion (CH,OH),,(CH,O)-clusters are also readily observed with n = 0-24 and these form the most-abundant negative ion series at low n. The (CH,OH),(CH,O)-, (CH,OH),(H,O)(CH,O)-and (CH,OH),(H,O)(CH,O)-cluster ions are formed and the abundaaces of these ions approach those of the (CH,OH),(CH,O)-ion series at high n. Cluster-ion structures and energetics have been examined using semiempirical molecular orbital methods.