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" 8. 1991, 113, 7461-7470 7461. a -.J. Am. Lnem. 3oc the results for the cation are at the geometry of the 12B, state
 

Summary: " 8. 1991, 113, 7461-7470 7461. a -.J. Am. Lnem. 3oc
the results for the cation are at the geometry of the 12B, state
of the cation, while the energy spacings between the anion states
determined from the energy loss and ETS measurements are at
the geometry of the neutral molecule. It would be most con-
structive to compare the above results with the 12B, -,22A,
transition energy of the cation at the geometry of the neutral
molecule. The necessary information could, in principle, be ob-
tained from the photoelectron spectrum. Unfortunately, photo-
electron spectroscopic studies do not yield a feature which can
be unambiguously assigned to the 22A, cation state.
IV. Conclusions
The energy-loss spectra of butadiene provide evidence for T*
anion states near 0.9 and 2.8 eV and T-'(T*)~anion states near
5.0,6.7, 8.1, 11.O, and 12.5eV. The two low-energy features are
due to the 12A,and 12B anion states, which have previouslybeen
assigned on the basis ofbTS. The 5.0-,6.7-, and 8.1-eV features
are attributed to the 22B,, 22A,, and 32A, anion states, respectively.
The 5-eV anion state decays strongly into both the 13Buand l'A,
states of the neutral molecule, indicating that it has both Ip and

  

Source: Apeloig, Yitzhak - Department of Chemistry, Technion, Israel Institute of Technology

 

Collections: Chemistry