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SUMMARY:Using Vibrations to Inform Electronic Stokes Shift Experiments
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20241107T160000
UID:2026-04-23-23-38-59@natsci.colostate.edu
DTSTAMP:20260423T233859
Description:About the Seminar:\n\nThe Stokes shift in electronic spectrosco
 py is the difference between the maximum frequency of absorption and emiss
 ion. Ultrafast studies of photoactive molecules have shown a time dependen
 ce on the Stokes shift\, revealing information about the dynamics of solva
 tion and vibrational relaxation. Additionally\, in many cases the role of 
 vibrational modes in electronic excitation/emission\, energy transfer\, an
 d electron transfer have been emphasized. The paper I will be discussing (
 Lu\, Lee\, Anna\, J. Phys. Chem. B 2020\, 124\, 8857-8867) highlights a n
 ew analysis method for 2D electronic spectroscopy which detects signal mod
 ulations caused by vibrational coherences and uses them to correct the fit
  for the dynamic Stokes shift. This leads to more accurate measurements of
  the decay time for the dynamic Stokes shift\, as well as allows for the d
 etermination of the dependence on excitation frequency in one 2DES experim
 ent. I discuss how this experiment is relevant today when 2DIR and 2DES ar
 e increasingly common tools to measure photoactive systems\, including pho
 toredox catalysts. 4:00 pm
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