Model study of coherent-control of the femtosecond primary event of vision

Article Abstract:

A birchirped coherent-control scenario is introduced and the feasibility of coherently controlling the femtosecond primary event of vision as modeled by an empirical Hamiltonian that properly describes the underlying reaction speed and efficiency is investigated. The result shows that the coupling between the reaction coordinate and the stretching mode of the polyene chain in the retinal chromophore induces decoherence within a time scale comparable to the reaction time.

Rhodopsin, Polyenes

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Contributions of Nh...O and CH...O hydrogen bonds to the stability of BETA-sheets in proteins

Article Abstract:

Ab initio quantum calculations were applied to both the parallel and the antiparallel arrangements of the BETA-sheets of proteins, and the energies of the Nh...O and CH...O hydrogen bonds present in the BETA-sheet evaluated separately from one another by appropriate modifications of the model systems. Results showed that there is little energetic distinction between the Nh...O and CH...O bonds in the full antiparallel BETA-sheet, just as in the parallel structure.

Protein research, Hydrogen bonding, Hydrogen bonds

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Limitations of essential-state models for description of two-photon absorption processes: the example of bis(dioxaborine)-substituted chromophores

Article Abstract:

Spectroscopic and quantum-chemical investigations are reported comparing the two-photon absorption (TPA) properties of a bis(dioxaborine)-substituted derivative of biphenyl with those of a bis(dioxaborine) carbazole derivative. Thus, a detailed comparison of the convergence of the theoretical approaches, and an analysis of the various channels that contribute to the TPA response in molecules with low effective symmetries are presented.

Photons

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