Low energy electron beam for time-of-flight ionization measurements

✍ Scribed by P Limão Vieira; R.F.M Lobo

• Book ID: 104266117
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 251 KB
• Volume: 52
• Category: Article
• ISSN: 0042-207X
• DOI: 10.1016/s0042-207x(98)00204-8

✦ Synopsis

A low energy electron gun was assembled in a crossed molecular beam apparatus in order to monitorize the eusive molecular beam density using the electron impact technique. Electrons were analised in both time-of-¯ight and Faraday cup detectors. The electrons coming directly from the gun were clearly identi®ed, allowing those ones coming from the ionization impact to be distinguished in time-of-¯ight with a multichannel analyser working in PHA mode. This set-up allows to make an estimation of the electron impact cross-section ratios in CCl 4 and air.