Preliminary Report on a large Mass Spectrograph newly constructed at Osaka University

Abstract

A new large mass spectrograph of double focusing type was constructed at Osaka University. The apparatus has a uniform magnetic field of π/3 sector type and √2 π/3 cylindrical electric field. The radius of central ion beam in magnetic field is 1200 mm and that in electric field 1093 mm. From the preliminary experiment, the dispersion coefficient was estimated to be about 9 cm for 1% mass difference and the maximum resolving power about 500,000. In the preliminary determination of N₂ ¹⁴-C¹²O¹⁶ doublet mass difference, a value of 112.441 (10^-4 amu) was obtained with the present condition.