Hc. Straub et al., ABSOLUTE PARTIAL CROSS-SECTIONS FOR ELECTRON-IMPACT IONIZATION OF H-2, N-2, AND O-2 FROM THRESHOLD TO 1000 EV, Physical review. A, 54(3), 1996, pp. 2146-2153
Absolute partial cross sections from threshold to 1000 eV are reported
for electron-impact ionization of H-2, N-2, and O-2 Data are presente
d for the production of H-2(+) and H+ from H-2; the production of N-2(
+), N+ + N-2(2+), and N2+ from N-2; and the production of O-2(+), O+ O-2(2+), and O2+ from O-2 The product ions are mass analyzed with a t
ime-of-flight mass spectrometer and detected with a position-sensitive
detector whose output provides clear evidence that all energetic frag
ment ions are collected. The overall uncertainty in the absolute cross
-section values for singly charged parent ions is +/-3.5% and is margi
nally higher for fragment ions. Previous cross-section measurements ar
e compared to the present results.