Laser-induced fluorescence (LIF) and laser-excited dispersed fluorescence (LEDF) spectra of the cycloheptatrienyl (tropyl) radical C7H7 have been observed under supersonic jet-cooling conditions. Assignment of the LIF excitation spectrum yields detailed information about the A-state vibronic structure. The LEDF emission was collected by pumping different vibronic bands of the A 2E"3<--X 2E"2 el...

A survey of ligand eld theory is given and the possibility of ob serving the Jahn Teller e ect in molecules by means of gas phase elec tron di raction is discussed The theory of the dynamic Jahn Teller e ect is outlined and theoretical and experimental results for VCl are reviewed In H A Jahn and E Teller predicted that a nonlinear molecule which is in a degenerate state will seek to change its...

The leader operators of the (d + 1)-dimensional relativistic rotating oscillators Abstract The main pairs of leader operators of the quantum models of rela-tivistic rotating oscillators in arbitrary dimensions are derived. To this end one exploits the fact that these models generate Pöschl-Teller radial problems with remarkable properties of supersymmetry and shape invariance.

We investigated the symmetry breaking mechanism in cubic octa-tert-butyl silsesquioxane and octachloro silsesquioxane monocations (Si8O12(C(CH3)3)8(+) and Si8O12Cl8(+)) using density functional theory (DFT) and group theory. Under Oh symmetry, these ions possess (2)T2g and (2)Eg electronic states and undergo different symmetry breaking mechanisms. The ground states of Si8O12(C(CH3)3)8(+) and Si...

We report a general method for the calculation of Jahn-Teller coupling constants by ab initio methods widely available today in standard packages. The vibrational frequencies corresponding to those obtained experimentally are calculated at the symmetric position using a generalized restricted Hartree-Fock (GRHF) wavefunction. The energy of the symmetric configuration is calculated as a conical ...

We use a deformed quasiparticle random phase approximation formalism to describe simultaneously the energy distributions of the single b Gamow-Teller strength and the two-neutrino double b decay matrix elements. Calculations are performed in a series of double b decay partners with A=48, 76, 82, 96, 100, 116, 128, 130, 136, and 150, using deformed Woods-Saxon potentials and deformed Skyrme Hart...

The ground state of acceptors in cubic semiconductors is fourfold degenerate (I?,) and the interaction with the lattice vibrations leads to the possibility of a Jahn-Teller effect [l]. The extended nature of the wave function of these defects [ 2 ] has two important consequences : (i) the interaction is mainly with long-wavelength acoustic phonons, (ii) because of the large elastic energy assoc...