Abstract
The instrument used in these studies is the RMH-2 mass spectrometer, of Nier-Johnson geometry having 70° electrostatic and magnetic sectors with an ion radius of 500 mm in the electric and 400 mm in the magnetic sectors. When operated at 10 kV a resolving power of 90,000 has been obtained. Typical energy profiles of the ion beam at 5 kV energy are shown having widths at half-height of ±0.26 V. The focussed ion beam at the source slit is about 0.08 mm wide. Curves obtained when the accelerating voltage is scanned at fixed electric sector voltage show a “third” field-free region in this instrument in which decomposition of meta-stable ions can be studied.
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