Femtoseconds
Mostrando 13-15 de 15 artigos, teses e dissertações.
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13. Spin-dependent mechanism for diatomic ligand binding to heme
The nature of diatomic ligand recombination in heme proteins is elucidated by using a Landau–Zener model for the electronic coupling in the recombination rate constant. The model is developed by means of explicit potential energy surfaces calculated by using density functional theory (DFT). The interaction of all possible spin states of the three common di
National Academy of Sciences.
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14. The first step in vision occurs in femtoseconds: complete blue and red spectral studies.
Femtosecond transient absorption measurements of the cis-trans isomerization of the visual pigment rhodopsin clarify the interpretation of the dynamics of the first step in vision. We present femtosecond time-resolved spectra as well as kinetic measurements at specific wavelengths between 490 and 670 nm using 10-fs probe pulses centered at 500 and 620 nm fol
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15. Resonant optical rectification in bacteriorhodopsin
The relative role of retinal isomerization and microscopic polarization in the phototransduction process of bacteriorhodopsin is still an open question. It is known that both processes occur on an ultrafast time scale. The retinal trans→cis photoisomerization takes place on the time scale of a few hundred femtoseconds. On the other hand, it has been propos
National Academy of Sciences.