Abstract
Charge-exchange cross-sections have been measured for ions of between 25 and 900 eV energy in collision with neutral atoms. The method involves collection and measurement of the chargeexchange ions when a beam is passed through gas. The cases A
+
in A, He
+
in He are in satisfactory agreement with the measurements of Rostagni, although showing no maxima at low energies. The cases O+ in N
2
, O
+
in A, and N
+
in A show abnormally high values which are believed to be due to the presence of m etastable ions, as well as contributions from the nitrogen rotational and vibrational energy. The cases H
+
in A, in Kr, in Xe and C
+
in Xe rise with an increasing energy, to a maximum when
a
Δ
E
/hv ≏ 1, Δ
E
being the energy defect of the hv process,
v
the velocity of the incident ion, and
a
a parameter of atomic dimensions ~ (5 to 10) 10
-8
cm.
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