Femtosecond electron detachment of aqueous bromide studied by two and three pulse spectroscopy

Physical Chemistry Chemical Physics : PCCP
Martin K FischerHristo Iglev

Abstract

The photodetachment of aqueous bromide after excitation at 202 nm is studied by pump-probe and pump-repump-probe spectroscopy. The initially excited charge-transfer-to-solvent state is followed by an intermediate assigned to non-equilibrated bromine-electron pairs. The subsequent dynamics are governed by equilibration, recombination and dissociation of the pairs, yielding the final hydrated electrons. An additional repump pulse is used for secondary excitation of the intermediate species, increasing the final number of hydrated electrons. Thus, a fraction of the solvent-separated bromine-electron pairs are converted to fully released electrons representing an optical manipulation of the photodetachment pathway. The observed hindrance of the recombination process by repumping allows determination of the effective lifetime of the solvent-separated atom-electron pairs to be 19 +/- 2 ps at room temperature. The measured temperature dependence of the time constant suggests a free energy barrier for pair dissociation of DeltaG = 0.15 +/- 0.02 eV.

References

Sep 16, 2000·Physical Review Letters·R LaenenA Laubereau
Jul 21, 2001·Science·I B MartiniB J Schwartz
Apr 15, 2004·Chemical Reviews·Christian Bressler, Majed Chergui
Jul 23, 2004·The Journal of Chemical Physics·Robert A CrowellStephen E Bradforth
Oct 18, 2007·The Journal of Physical Chemistry. a·Christian PetersenSøren R Keiding
Nov 9, 2007·Annual Review of Physical Chemistry·Xiyi Chen, Stephen E Bradforth
Feb 20, 2008·The Journal of Chemical Physics·Christopher G EllesEric C Landahl

❮ Previous
Next ❯

Citations

Dec 30, 2010·Journal of the American Chemical Society·Hristo IglevAlfred Laubereau
Jul 4, 2013·The Journal of Physical Chemistry. a·Ilya A ShkrobJames F Wishart
Oct 15, 2011·Physical Chemistry Chemical Physics : PCCP·Joel Torres-AlacanPeter Vöhringer
Jun 15, 2011·The Journal of Chemical Physics·Martin K FischerHristo Iglev
Feb 3, 2011·Journal of Biophotonics·Martin K FischerHristo Iglev
Aug 9, 2018·The Journal of Physical Chemistry. a·C DubosqB Gervais

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

© 2022 Meta ULC. All rights reserved