title: A novel double-focusing time-of-flight mass spectrometer for absolute recoil ion cross sections measurements.
abstract: In this work, the inclusion of an Einzel-like lens inside the time-of-flight drift tube of a standard mass spectrometer coupled to a gas cell-to study ionization of atoms and molecules by electron impact-is described. Both this lens and a conical collimator are responsible for further focalization of the ions and charged molecular fragments inside the spectrometer, allowing a much better resolution at the time-of-flight spectra, leading to a separation of a single mass-to-charge unit up to 100 a.m.u. The procedure to obtain the overall absolute efficiency of the spectrometer and micro-channel plate detector is also discussed.
authors: Instituto de Física, Universidade Federal Fluminense (UFF), 24210-346 Niterói, RJ, Brazil.
authors: L
authors: L
authors: Sigaud
authors: Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro (IFRJ), Campus Nilópolis, 26530-060 Nilópolis, RJ, Brazil.
authors: V L B
authors: VL
authors: de Jesus
authors: CEFET/RJ, Unidade Maracanã, 20271-110 Rio de Janeiro, RJ, Brazil.
authors: Natalia
authors: N
authors: Ferreira
authors: Instituto de Física, Universidade Federal do Rio de Janeiro (UFRJ), P.O. Box 68528, 21941-972 Rio de Janeiro, RJ, Brazil.
authors: E C
authors: EC
authors: Montenegro