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SUMMARY:Liquid microjet photoelectron spectroscopy - Prof Helen Fielding\,
  Department of Chemistry\, University College London
DTSTART:20210316T140000Z
DTEND:20210316T150000Z
UID:TALK156148@talks.cam.ac.uk
CONTACT:David Madden
DESCRIPTION:In nature\, light drives many important processes\, such as ph
 otosynthesis and vision. Light-driven processes are also important in tech
 nology\, such as in nanoscale electronic devices. At the heart of all thes
 e processes are small chromophores that absorb light and\, subsequently\, 
 undergo small-scale structural changes. Understanding the fundamental phot
 ophysics and photochemistry of the chromophores that determine the efficie
 ncy of light-driven processes in nature and technology is crucial for the 
 rational design of new photomaterials for a range of applications such as 
 photovoltaics and bioimaging. In addition to a detailed knowledge of the i
 ntrinsic electronic structures of these chromophores\, it is important to 
 have an understanding of the roles of their environments.\n\nExperimentall
 y\, a direct way of probing electronic structure is through the measuremen
 t of electron binding energies using photoelectron spectroscopy (PES). Liq
 uid-microjet UV PES is\nemerging as a valuable probe of the electronic str
 ucture of weakly soluble organic chromophores in solution. This seminar wi
 ll begin with an introduction to PES\, a brief review of the history of li
 quid-microjet photoelectron spectroscopy and a discussion of some the chal
 lenges facing UV PES of liquids. It will follow on with a brief descriptio
 n of the design and\noperation of the recirculating liquid-microjet PES in
 strument we have built at UCL for studying samples that are available in r
 elatively small quantities and a discussion of illustrative liquid-microje
 t PES measurements of fluorescent protein chromophores and their building 
 blocks.
LOCATION:via zoom - please contact David Madden for the zoom link
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