Isao Takeshita

Mattauch‐Herzog Type Mass Spectrograph with Corrected β‐Dependent Image Defects for All Masses

An earlier work on a Mattauch‐Herzog type mass spectrograph with a two‐stage electrostatic field is extended to investigating the conditions for simultaneous elimination of αβ and β2 aberrations for all masses. In the course of study, the condition for obtaining a real image of ion source between two electrostatic fields is abandoned, and by this extension two series of solutions are found in neighborhood of φe2=π/√2. The design parameters are numerically computed and tabulated for several examples. The α2 aberrations are calculated and the total image defects are evaluated and found to be very small for a wide mass range.

A Simple Method for Digital Recording of Mass Spectra

A simple method has been developed for digital measurement and recording of mass spectra. The system consists of a peak memory, a maximum detector, a measure command generator, an automatic reset signal generator and a conventional autorange digital voltmeter. It can measure the peak height of mass spectra from 3 mV to 10 V. The precision is within ± 0.5% for the input signal higher than30 mV.