Trapping of pulse injected ions in a radio-frequency quadrupole trap

O. Chun-Sing, H.A. Schuessler
1982 Revue de Physique Appliquée  
2014 Le stockage des ions injectés du dehors à l'intérieur d'une cage quadrupolaire HF est étudiée. Par ceci la tension de confinement à haute fréquence est mise en circuit phase synchronisée. On utilise en particulier la méthode d'espace de phase pour dériver les conditions optimales. En principe il est possible de piéger les ions indéfiniment. Une efficience haute de piégeage, proche de l'unité, est possible. Une sélectivité d'énergie et de masse peut être aussi réalisée. Abstract. 2014 The
more » ... bstract. 2014 The possibility of trapping ions from an externally injected pulsed ion beam in a radio-frequency quadrupole ion trap, with phase-synchronized switching-on of the driving field, was investigated. Phase space methods were used to derive the optimum conditions for permanently trapping the injected ions. A high trapping efficiency, close to unity, is possible and energy-selectivity as well as mass-selectivity of the stored ions can be obtained. Revue Phys. Appl.17 (1982) 83-88 FÉVRIER 1982, PAGE : Classification Physics Abstracts 06.70 -07.75 1. Introduction. -Novel spectroscopic investigations of charged atomic systems can be realized if externally generated ions are caught in flight and subsequently localized in a finite observation volume. In particular on-line spectroscopy of radioactive ions [1], highly charged ions [2], and exotic ions produced by any means are of interest. To investigate this possibility, the ion confinement properties of a radiofrequency (r.f.) quadrupole ion trap are evaluated for pulsed ion beams injected from the outside. The r.f. ion trap [3, 4] consists of a central ring electrode, which is a hyperboloid of revolution, and two end-cap electrodes, which are complementary hyperboloids. The symmetric axis of the ion trap is defined as the z-axis. When a potential difference U is maintained between the ring electrode and the end-cap electrodes, the rotationally symmetric potential distri-
doi:10.1051/rphysap:0198200170208300 fatcat:ol5fbt7ijra4vk2hg2ymrwuz4i