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The Jahn-Teller and pseudo-Jahn-Teller effects in the anion photoelectron spectroscopy of B3 cluster

( 2006-07-30) Venkatesan, T. S. ; Deepika, K. ; Mahapatra, S.

The photodetachment spectroscopy of B3- anion is theoretically studied with the aid of a quantum dynamical approach. The theoretical results are compared with the available experimental photoelectron spectra of B3-. Both B3- and 83 possess D3h symmetry at the equilibrium configuration of their electronic ground state. Distortion of B3 along its degenerate vibrational mode v2 splits the degeneracy of its excited C∼2E′ electronic manifold and exhibits (E ⊗ e)-Jahn-Teller (JT) activity. The components of the JT split potential energy surface form conical intersections, and they can also undergo pseudo-Jahn-Teller (PIT) crossings with the X̃2A′1 electronic ground state of v2 via the degenerate v2 vibrational mode. The impact of the JT and PJT interactions on the nuclear dynamics of B 3 in its X̃2A′1- C̃2E′ electronic states is examined here by establishing a diabatic model Hamiltonian. The parameters of the electronic part of this Hamiltonian are calculated by performing electronic structure calculations and the nuclear dynamics on it is simulated by solving quantum eigenvalue equation. The theoretical results are in good accord with the experimental data. © 2006 Wiley Periodicals, Inc.