We have studied the formation of Na+3 ions in collisions of Na(3d, 5s, 4d) atoms with vibrationally excited Na2(v″) molecules in their electronic ground state in a supersonic beam. The cross-section of the Na(4d5/2) + Na2 associative ionization is found to be about six times larger than that of the corresponding atomic reaction Na(4d5/2) + Na(3s) → Na+2. Associative ionization in collisions of Na(3d) with Na2(v″) is observed only with vibrationally excited Na2 molecules. The cross-section σ(v″) of this reaction increases only slightly with v″ for low vibrational excitation, while a strong increase with v″ is observed for v″ ≥ 26. The latter observation suggests the opening of the channel leading to the formation of Na+3 ions in the first electronically excited state for v″ ≥ 26.
|Original language||English (US)|
|Number of pages||7|
|Journal||European Physical Journal D|
|State||Published - Aug 1999|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics