Reference : An electronic time scale in chemistry
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
An electronic time scale in chemistry
Remacle, Françoise mailto [Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de chimie physique théorique >]
Levine, R. D. [> > > >]
Proceedings of the National Academy of Sciences of the United States of America
National Academy of Sciences
Yes (verified by ORBi)
[en] Ultrafast, subfemtosecond charge migration in small peptides is discussed on the basis of computational studies and compared with the selective bond dissociation after ionization as observed by Schlag and Weinkauf. The reported relaxation could be probed in real time if the removal of an electron could be achieved on the attosecond time scale. Then the mean field seen by an electron would be changing rapidly enough to initiate the migration. Tyrosine-terminated tetrapeptides have a particularly fast charge migration where in < 1 fs the charge arrives at the other end. A femtosecond pulse can be used to observe the somewhat slower relaxation induced by correlation between electrons of different spins. A slower relaxation also is indicated when removing a deeper-lying valence electron. When a chromophoric amino acid is at one end of the peptide, the charge can migrate all along the peptide backbone up to the N end, but site-selective ionization is probably easier to detect for tryptophan than for tyrosine.

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