Abstract
The crossed-beam method described by the authors in 1961 was used to measure the cross-section of Ne
+
in the reaction Ne
+
+
e
→ Ne
2+
+ 2
e
. The cross-section increases linearly with electron energy near the threshold and attains a maximum value of 3·13 x 10
-17
cm
2
at 200 eV. The errors in the measurements were estimated to be less than ± 10% and the highest incident electron energy used was 1000 eV. A semi-empirical formula proposed by Drawin in 1961 describes the measured cross-section within the above limits of error when the two adjustable parameters take the values
ξf
1
= 5·25 and
f
2
= 0·70.
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