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SUMMARY:Ultrafast Photoelectron Spectroscopy of Excess Electrons in Water 
 and Alcohols
DTSTART:20190902T110000
DTEND:20190902T120000
DTSTAMP:20260916T034720Z
UID:a7af8b2f614bf77e98f6da1c505425fce925fbd3d316badd261b5980
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Toshinori Suzuki\nKyoto University\, Japan\nWeyl found s
 trong blue coloration of liquid ammonia by dissolving sodium and potassium
  in 1864\, and it was identified later as due to an electronic transition 
 of solvated electron. A number of theoretical and experimental studies hav
 e been reported on solvated electrons\, while their structures and dynamic
 s are not fully understood yet. We employed ultrafast photoelectron spectr
 oscopy of liquid microjets of water\, methanol and ethanol to investigate 
 electron binding energy (eBE)\, electronic relaxation\, and solvation dyna
 mics of solvated electrons. Using a single order high-harmonic light sourc
 e (hn = 29 eV)\, we refined the previously reported eBE values of solvated
  electrons and found the eBE distributions to be Gaussian. Using the eBE f
 unction\, we developed a spectral retrieval method that enables us correct
  UV photoelectron spectra against electron inelastic scattering in the liq
 uids. The excited state lifetimes of solvated electrons were measured usin
 g 3 sequential femtosecond pulses for synthesis\, pump and probe. The phot
 oelectron signals from the excited and ground state of solvated electron w
 ere clearly differentiated\, and we found that non-adiabatic transition fr
 om the first excited state occurs in considerably shorter time than theore
 tical prediction. The solvation times in the ground state of solvated elec
 tron were extracted for the first time.\n \nRef.\nNishitani et al.\, Sci.
  Adv. 5\, eaaw6896 (2019)\nKarashima et al.\, J. Phys. Chem. Lett. 10\, 44
 99–4504 (2019)\n \n 
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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