Abstract
Positive ions have been trapped for periods of ca. 100 /zs within the space charge of a magnetically confined electron beam, ionized by this beam and detected mass-spectrometrically. The theory of the trap is developed and compared at many points with experiment. Cross section functions are given for the ionization of Ne
+,
Ar
+
, Kr
+
, Xe
+
, and the dissociation of CO
+
by electrons; the ionization of Ne
2
+
and CO
+
by electrons is also investigated. From measurements of fragment ion currents CH
2
+
, CH
+
from methane, it is shown that the dissociation of CH
4
+
by electrons can contribute unwanted effects interfering with the appearance potential of the fragment ion. Effects due to excitation of ions by electrons are observed in the noble gases.
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