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  4. Charge-transfer and impulsive electronic-to-vibrational energy conversion in ferricyanide: ultrafast photoelectron and transient infrared studies'
 
research article

Charge-transfer and impulsive electronic-to-vibrational energy conversion in ferricyanide: ultrafast photoelectron and transient infrared studies'

Ojeda, Jose  
•
Arrell, Christopher A.  
•
Longetti, Luca  
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2017
Physical Chemistry Chemical Physics

The photophysics of ferricyanide in H2O, D2O and ethylene glycol was studied upon excitation of ligand-to-metal charge transfer (LMCT) transitions by combining ultrafast photoelectron spectroscopy (PES) of liquids and transient vibrational spectroscopy. Upon 400 nm excitation in water, the PES results show a prompt reduction of the Fe3+ to Fe2+ and a back electron transfer in similar to 0.5 ps concomitant with the appearance and decay of a strongly broadened infrared absorption at similar to 2065 cm(-1). In ethylene glycol, the same IR absorption band decays in similar to 1 ps, implying a strong dependence of the back electron transfer on the solvent. Thereafter, the ground state ferric species is left vibrationally hot with significant excitation of up to two quanta of the CN-stretch modes, which completely decay on a 10 ps time scale. Under 265 nm excitation even higher CN-stretch levels are populated. Finally, from a tiny residual transient IR signal, we deduce that less than 2% of the excited species undergo photoaquation, in line with early flash photolysis experiments. The latter is more significant at 265 nm compared to 400 nm excitation, which suggests photodissociation in this system is an unlikely statistical process related to the large excess of vibrational energy.

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Type
research article
DOI
10.1039/c7cp03337k
Web of Science ID

WOS:000405422900012

Author(s)
Ojeda, Jose  
Arrell, Christopher A.  
Longetti, Luca  
Chergui, Majed  
Helbing, Jan
Date Issued

2017

Publisher

Royal Society of Chemistry

Published in
Physical Chemistry Chemical Physics
Volume

19

Issue

26

Start page

17052

End page

17062

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSU  
Available on Infoscience
September 5, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/140198
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