The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2012
Filed:
Dec. 12, 2007
Hideaki Izumi, Neyagawa, JP;
Kengo Takeshita, Uji, JP;
Kiyoshi Ogawa, Nara, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
The main voltage generator () applies a rectangular-wave radio-frequency voltage to the ring electrode () in order to capture ions inside the ion trap (). In the case where the TOFMS () is operated in the reflectron mode, the radio-frequency voltage is changed into a constant voltage value when the phase thereof is 1.5π, and a voltage for expelling ions is applied to the end cap electrodes () to expel the ions from the exit aperture () and introduce them into the TOFMS (). In this case, since the velocity spread of the ions inside the ion trap () is small and so is the spatial spread thereof, a high mass resolution and accuracy can be achieved while assuring a high detection sensitivity. In the case where the TOFMS () is operated in the linear mode, the radio-frequency voltage is changed into a constant voltage value when the phase thereof is 0.5π, and then the ions are expelled. In this case, a high mass resolution and mass accuracy can be achieved since the variation of the ions' acceleration, which cannot be converged in the linear mode, can be suppressed.