Bound rovibronic levels of the [formula omitted] complex
We have used ab initio MRCI (multireference internally contracted configuration interaction) potential energy functions to compute the energies of the bound rovibronic levels of the T-shaped nearly-degenerate electronically excited HeN 2 +(A 2Π) . In these calculations a variational approach which i...
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Published in | Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 53; no. 8; pp. 1133 - 1138 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.07.1997
|
Subjects | |
Online Access | Get full text |
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Summary: | We have used ab initio MRCI (multireference internally contracted configuration interaction) potential energy functions to compute the energies of the bound rovibronic levels of the T-shaped nearly-degenerate electronically excited
HeN
2
+(A
2Π)
. In these calculations a variational approach which includes the rotation-vibration, the electronic angular and spin momenta couplings has been employed. The wavenumbers for the large amplitude bending and stretching modes have been calculated to lie around 60 and 75 cm
−1, respectively. For
J =
1
2
, three states with excited bending and one state with excited stretching mode were found to be bound. The weak interaction between He and the
N
2
+
(A
2Π
u) state leads to a spin flip. The inverted doublet in
N
2
+
(A
2Π
u) becomes a normal doublet in the complex. This unusual effect is attributed to large anisotropies and to a large difference potential between the A′ and A″ components, which leads also to the largest known parity splittings in Renner-Teller weakly bound complexes. |
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ISSN: | 1386-1425 |
DOI: | 10.1016/S1386-1425(97)00021-8 |