The fragmentation of LiH2- anions after electron
impact was investigated at the heavy-ion storage ring TSR.
The main reaction channel was found to be electron detachment followed by a
breakup into LiH + H.
In the first ms after production of the molecular ions in a cesium
sputtering ion source, additional
contributions were observed in the Li + H2 and Li- + H2 channels,
hinting at an initial population of a short-lived state of the anion.
To gain a better understanding of the mechanisms underlying the observed
behavior of the system, ab initio calculations of relevant potential
energy surfaces were performed at selected geometries.
The experimental findings are discussed in the
light of these calculations.
34.80.Ht Dissociation and dissociative attachment by electron impact 34.20.Mq Potential energy surfaces for collisions 34.50.Gb Electronic excitation and ionization of molecules;
intermediate molecular states (including lifetimes, state mixing, etc.)
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