Experimental and Theoretical Studies of the HeICl Van der Waals Complexes in the Valence and Ion-pair States.

The article presents results of experimental and theoretical analysis of the T-shaped and linear HeICl van der Waals complexes in the valence A1 and ion-pair β1 states as well as the HeICl(A1,v ,n ←X0 ,v =0,n and β1,v ,n ←A1,v ,n ) optical transitions (n are quantum numbers of the vdW) modes). The HeICl(β1,v ,n )→He+ICl(E0 , , β1) decay are also studied. Luminescence spectra of the HeICl(β1,v =0-3,n ) complex electronic (ICl(E0 ,v , ) and vibrational ICl(β1,v ) predissociation products are measured, and branching ratios of decay channels are determined.

Experimental and theoretical investigation of the ArICl van der Waals complexes in the valence and ion-pair states.

This paper presents the experimental and theoretical analyses of ArICl(IP,v,n) states' population and decay at energies lower than the ArICl(E,v = 0,n) dissociation limit (IP = E0, D'2, β1), v = 0, 1, and n are the quantum numbers of the van der Waals (vdW) modes. We have measured the excitation spectra of the ArICl(E,v = 0,1,n → X,v,n) and ArICl(β,0,n → A and/or D,v ,n →A luminescence as well as luminescence spectra themselves. To construct potential energy surfaces (PESs) for valence (A1, A'2) and ion-pair (E, β, and D') electronic states of the complex, we utilized the intermolecular diatomic-in-molecule perturbation theory first order method.

Experimental and theoretical investigations of HeNeI trimer.

We report on the results of spectroscopic studies of the HeNeI van der Waals trimer using the two-step two-color HeNeI(E0 , v = 0-3 ←hνB0 , v = 19 ←hνX0 , v = 0) excitation scheme. The excitation spectra of the HeNeI(B, E) decay product luminescence and the luminescence spectra of I ion-pair states formed after HeNeI(E) decay have been recorded and analyzed. The HeNeI(X, B, E) binding energies have been estimated to be less than 111.

Heterogeneous and hyperfine interactions between valence states of molecular iodine correlating with the I((2)P1/2) + I((2)P1/2) dissociation limit.

Detailed analysis of interactions between all 0g (+), 1u, and 0u (-) weakly bound states of iodine molecule correlating with the I((2)P1/2) + I((2)P1/2) (bb) dissociation limit has been performed. For this purpose, the 0u (-) (bb) state has been described using analysis of rotationally resolved excitation spectra of luminescence from the g0g (-) state populated in a three-step three-color perturbation facilitated excitation scheme via the 0u (-) state. Energies of 41 rovibrational levels, molecular constants, and potential energy curve have been determined.

Dynamics and mechanism of the E-->D, D', beta, gamma, and delta nonadiabatic transitions induced in molecular iodine by collisions with CF4 and SF6 molecules.

Nonadiabatic transitions among the first-tier ion-pair states of the iodine molecule in collisions with CF(4) and SF(6) partners are investigated by detecting the luminescence following the optical-optical double resonance excitation of the E0(g) (+)-state to the vibrational levels v(E)=8, 13, and 19. Total and partial rate constants, as well as vibrational product state distributions, are determined. It is found that electronic energy transfer in all channels is predominantly assisted by excitation of the dipole-allowed nu(3) and nu(4) modes of the partner.