Picosecond dynamics of iron proteins

D. Huppert; K. D. Straub; P. M. Rentzepis

doi:10.1073/pnas.74.10.4139

Picosecond dynamics of iron proteins

D. Huppert, K. D. Straub, P. M. Rentzepis

Research output: Contribution to journal › Article › peer-review

Abstract

The excitation of hemoproteins containing either Fe²⁺ or Fe³⁺ with a picosecond light pulse resulted in the bleaching and recovery of the iron absorbance bands within 6 psec. A new absorbance band also was observed whose formation and decay rate of less than 6 psec suggests that it is probably due to S₁ → S(n) absorbance. The Soret band relaxation time is deduced to be ∞0.5 psec whereas the free base hemoprotein does not show any of the above fast-decay characteristics. Therefore, there is a strong influence of the metal on the energy dissipation process.

Original language	English
Pages (from-to)	4139-4143
Number of pages	5
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	74
Issue number	10
DOIs	https://doi.org/10.1073/pnas.74.10.4139
State	Published - 1977
Externally published	Yes

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AB - The excitation of hemoproteins containing either Fe2+ or Fe3+ with a picosecond light pulse resulted in the bleaching and recovery of the iron absorbance bands within 6 psec. A new absorbance band also was observed whose formation and decay rate of less than 6 psec suggests that it is probably due to S1 → S(n) absorbance. The Soret band relaxation time is deduced to be ∞0.5 psec whereas the free base hemoprotein does not show any of the above fast-decay characteristics. Therefore, there is a strong influence of the metal on the energy dissipation process.

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Picosecond dynamics of iron proteins

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