,\\ . \\ Krlshnan Baiasukamanian has been an Assmiate Professw of CblIWty slna, 1987 at Arkma State UntverSHy. Tempe. AZ. He was born in Bangalore. Indla. in 1956. He received his MSc. (Hawrs) desee from the &! a 1e of Techndogy and sdence. Pilani. India. in 1977 and his M.A. and Ph.D. degrees from The Johns Hopkims LhiverSny in 1980. He was a pcstdoctaai assodate and visiting lectuer in ttm Depamnent of Chemishy and Lawrence Berkeley Laboratwy. University of California. Berkeley. from 1980 to 1983. From 1983 1

Spectroscopic constants and potential-energy curves of heavy p-block dimers and trimers.

Although the diatomic halogens are endowed with a wide range of intravalence-shell electronic states, the number and variety of these states is far from obvious in one-photon absorption from the ground state where only a few regions of structured absorption are present at visible and UV wavelengths. Selection rules on angular momentum and parity are key players in enforcing this sparse structure, but Franck- Condon effects also exercise considerable influence by directing transitions into regions where the transition dipole is small o r into a continuum where much of the detail is lost: further, a simultaneous excitation of two o r more electrons is formally forbidden in single-photon transitions. Some of the obstacles to one-photon absorption are avoided in the sequential absorption of two o r three photons using the conveniently placed, low-lying excited sQtes in the visible region for the initial step, in effect broadening the perspective from the ground state to include that from the lower ex...

Multiphoton Spectra and States of Halogens

In this paper we give a full account of the work presented in earlier communications [Lienau et al. Chem. Phys. Lett. 1993, 213, 289; 1994, 218, 224; J. Chim. Phys. 1995, 92, 566]. With femtosecond time resolution, studies are presented of the dynamics in real time of an elementary chemical reaction, the dissociation and recombination of iodine in supercritical rare-gas solvents, in the gas-to-liquid transition region. Through pressure variation, the properties of the solvent, helium, neon, argon, or krypton, are changed from those of an essentially ideal gas at low densities to those of a liquidlike fluid at pressures of several thousand bar. Of particular interest here are (i) the impact of solute−solvent interactions on the coherence of the wave packet nuclear motion, (ii) the collision-induced predissociation of the B state, and (iii) the geminate recombination of the atomic fragments and the subsequent vibrational energy relaxation within the A/A‘ states. In helium and neon, the coherence of the vibrational motion persists for many picoseconds, even at pressures of 2000 bar. For pressures between 100 and 2000 bar of helium and neon, the dephasing rate is only weakly affected by the solvent density. In all solvents, the solvent-induced predissociation rate increases nearly linearly with solvent density. In argon at 2500 bar, the predissociation rate reaches 1.05 ps^(-1). Relative geminate recombination yields for the formation of new A/A‘ state iodine molecules and the time scale for the geminate recombination and the subsequent A/A‘ state vibrational relaxation dynamics are also studied. The solvation and chemical dynamics are examined, using simple analytical models, in relation to the solvent density and polarizability. With the help of molecular dynamics, detailed in the accompanying paper, we present a microscopic picture of the elementary processes under the free and solvation conditions encompassing the different density regimes in the gas-to-liquid transition region.

Solvation Ultrafast Dynamics of Reactions. 11. Dissociation and Caging Dynamics in the Gas-to-Liquid Transition Region

The E-B band system of diatomic iodine

Association of atomic oxygen and airglow excitation mechanisms

Reinterpretation of the emission spectrum of I2 in argon

New chelating agents obtained by the addition of thiols to acetylene dicarboxylic acid

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Reinterpretation of the emission spectrum of I2 in argon

New chelating agents obtained by the addition of thiols to acetylene dicarboxylic acid