ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
We have measured the photoelectron spectrum of Si−2 and find that the molecular electron affinity is EA(Si2)=2.199±0.012 eV. This spectrum apparently involves multiple electronic states of the Si−2 ion as well as several electronic states of the final neutral, Si2. In order to unravel our experimental findings, we have carried out ab initio MCSCF+1+2 CI calculations on both species. These calculations suggest that there are two nearly degenerate states for both Si2 and Si−2. We can fit our experimental data by assuming detachment from two states of Si−2 :X (2Π) [re=2.187 A(ring)] and A (2Σ+g) [T0=0.117±0.016 eV, re=2.127 A(ring)]. We observe two final states of Si2: X (3Σ−g) [re=2.246 A(ring)] and A (3Πu) [T0=0.053±0.015 eV, re=2.171 A(ring)]. These assignments are confirmed by an experimental study of the angular distributions of the photodetached electrons.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.453679
