Aw. Baerveldt et al., ABSOLUTE VALUES OF CROSS-SECTIONS FOR IONIZATION OF NEON ATOMS IN COLLISIONS WITH SODIUM ATOMS IN THE ENERGY-RANGE 200-400 EV, Journal of physics. B, Atomic molecular and optical physics, 26(22), 1993, pp. 4163-4168
Previous relative measurements of the differential cross sections for
ionization of neon atoms in collisions with fast sodium atoms have bee
n put on an absolute scale. This was done by measuring the ratio of io
ns and neutral atoms in a fast mixed (ions and neutrals) sodium beam a
nd by using the well known differential cross section for elastic scat
tering of sodium ions by neon atoms. The measured ionization cross sec
tions exhibit a steep rise from threshold to a flat maximum between 30
0 and 400 eV.