European Journal of Mass Spectrometry - Abstract of Development of an ion trap/multi-turn time-of-flight mass spectrometer with potential-lift

Kenichi Iwamoto,^a Hirofumi Nagao^b and Michisato Toyoda^c
^aDepartment of Chemistry, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuencho Nakaku, Sakai, Osaka 599-8531, Japan
^bDivision of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0781, Japan
^cDepartment of Physics, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan

An ion trap/multi-turn time-of-flight (ToF) mass spectrometer with potential-lift has been developed. This system consists of an external ion source, a lens system, an ion trap, a potential-lift, a multi-turn ToF mass spectrometer and a detector. The ion trap consists of hyperbolic electrode cross-sections (Paul trap) and is used as an ion storage device. The potential-lift, which is part of the flight tube, was attached between the ion trap and the multi-turn ToF mass spectrometer. The potential-lift is known to be useful for increasing the kinetic energy of the ions. In order to check the ability of the potential-lift, mass distributions of [(CsI)_n Cs]+ clusters (n = 1–9) were measured. The relative intensity ratios of the [(CsI)_nCs]+ clusters were consistent with the results obtained using other apparatus. To check the properties of the new apparatus, Xe+ isotopes were analyzed using either a linear or multi-turn ToF mass spectrometer. In the linear mode, the mass resolution was 500. In the multi-turn mode, the resolution depended on the number of cycles of the multi-turn ToF mass spectrometer; the mass resolution was 4400 (FWHM) after nine cycles. This new apparatus with a high resolution will be useful for measurements of ion–molecule reactions and photodissociations.