The γ-ray de-excitations following the β-decay of Ga and the β-n decay of Ga have been studied. The radioactive species were produced using the PARRNe on-line mass-separator installed at the IPN Orsay Tandem accelerator. Two γ-lines were attributed to Ge with the aid of β-γ and γ-γ coincidences. The Z identification of the γ-lines was provided by time analysis of a buid-up/decay cycle. The exci...

Spectroscopic characteristics of Pr3+ and Eu3+ in K2Na2GdF7, K5Li2GdF10 and K3GdF6 fluoride matrices are considered. Crystal structures of these compounds have been ascertained based on X-ray measurement on single crystal samples. Energies of lattice vibrations have been derived from IR and Raman spectra. Spectroscopic features of crystals in the VUV region were studied using experimental facil...

A realistic description of the kinetics of excited-state proton transfer to solvent ~PTTS! involves several simultaneous processes. Perhaps most well-studied is the reversibility of this diffusion-influenced reaction, leading to the t asymptotic decay of the initially bound state. This shows that the solvated geminate proton may recombine with the base adiabatically, in the excited electronic s...

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Abstract A simple one-dimensional quantum system with two attractive δ-function potentials of strength q at x±1 is subjected to a spatially asymmetric (as in the dipole interaction) harmonic forcing with frequency ω. The time evolution of the system, which has two discrete energy levels −ωs < −ωa (depending on q) and a continuum spectrum, exhibits a rich dynamics including regimes where the rat...

We investigate the usefulness of density functional theory ~DFT! for calculating excited state potential energy surfaces. In the DFT calculations, the generalized gradient approximation ~GGA! is used. As a test case, the photodissociation of H2O through the first excited à B1 state was considered. Two-dimensional potential energy surfaces were obtained for both the X̃ A1 ground state and the fir...

A breakdown of the standard Watson-type rotational Hamiltonian was suggested for a molecule with H2XYZ structure [Š. Urban and K. M. T. Yamada, J. Mol. Spectrosc. 160, 279–288 (1993)] . This breakdown is due to a near-resonant interaction between the ground state rotational levels and rotational levels in an excited vibrational state. This interaction has been observed in the excited electronic...

The synthesis, characterization, and quantitative electronic structure modeling of multi-photon absorption properties of a neat liquid L34 (4-propyl 40-butyl diphenyl acetylene) are reported. The liquid is (linearly) transparent in the visible spectrum, but possesses large two-photon absorption (2PA) and 2PA-induced singlet and triplet excited-state absorption as measured by the Z-scan techniqu...

A comprehensive picture of the ultrafast nonradiative decay mechanisms of three cytosine tautomers (amino-keto, imino-keto, and amino-enol forms) is revealed by high-level ab initio potential energy calculations using the multistate (MS) CASPT2 method and also by on-the-fly excited-state molecular dynamics simulations employing the CASSCF method. To obtain a reliable potential energy profile al...