Shimadzu Corporation

Kobe University

Tohru Kinugawa

Osamu Furuhashi

Shigeki Kajihara

Kiyoshi Ogawa

An embodiment with a dual-stage reflectron is as follows: (1) On the assumption that a reflector has a base potential X(U) created by uniform electric fields, its design parameters are adjusted so as to cancel the first and second order derivatives at energy E=Eof a total time of flight T(E), and a second-order focusing position on a central axis at which the potential value becomes zero is determined (Mamyrin solution). (2) A correcting potential X(U) to be superposed on X(U), beginning from the second-order focusing position, is calculated so that T(E) of ions reflected in a region deeper than the second-order focusing position will be constant. (3) Voltage values of the reflector electrodes are determined so that a real potential X(U)=X(U)+X(U) is created on the central axis.

Time-of-flight mass spectrometer

A method creates an accurate mass spectrum with a high resolving power based on a plurality of TOF spectra, while reducing the computation to assure real-time processing. TOF spectra are measured when ions are ejected from the loop orbit. Then a coincidence detection method determines what mass-to-charge ratio a peak appearing on the TOF spectra originates from. The time range in which a corresponding peak appears on other TOF spectra is set, and the existence of the peak in that range is determined. When the corresponding peak is found on other TOF spectra, the m/z is deduced from the peak on the TOF spectrum with the highest resolving power and a mass spectrum is created. From the peak density around the peak of interest, the reliability of the deduction is computed. For a low reliability peak, the ion ejection time is optimized and the TOF spectrum is measured again.

Mass analysis data processing method and mass spectrometer

A multi-turn time-of-flight mass spectrometer creates, an accurate mass spectrum of a wide mass range, with the smallest number of measurements. Deflecting electrodes are provided on an ejection path through which ions deviating from a loop orbit fly to a detector having two-dimensional array elements. A varying voltage applied to the deflecting electrodes creates an electric field. When two ions having different mass-to-charge ratios simultaneously arrive at the detector, these ions are affected with differing strengths since they pass through the deflecting electric field at different times. This results in arrival for the ions on a detection surface. The time an ion passing through the deflecting electric field can be calculated from the displacement of the arrival position of that ion. Then the flight speed of the ion is obtained and its number of turns is roughly deduced to arrive at its mass-to-charge ratio.

Growing community of inventors

Osaka, Japan

Tohru Kinugawa