Abstract
A single focusing mass spectrometer with large incident and exit angles has been constructed. The radius of the magnetic field is 50 mm and both incident and exit angles are 55°. The deflection angle is 130°. A small electromagnet produces a maximum magnetic field of 5500 gauss in the magnet gap of 5 mm. A resolving power of 580 was obtained with 0.05 mm source slit and 0.10 mm collector slit. The mass spectra of H2+ - He++ doublet and He+ - D2+ doublet are given. The experimental results have shown that this ion optical system gives resolving power three times as big as that of single focusing mass spectrometer with normal incident and exit.
