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Cross sections (10 -20 cm 2 )<br />
<br />
<br />
v<br />
<br />
e H Rydberg<br />
<br />
H H<br />
H i<br />
<br />
2<br />
2<br />
5.0<br />
4.0<br />
3.0<br />
2.0<br />
1.0<br />
0.0<br />
5 10 15 20 25<br />
Electron energy (eV)