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SUMMARY:Harnessing Energy Flow in Molecules & Nanomaterials: A Tale of 
 Forbidden Transitions, Molecular Motions, and Exotic Excitations
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20231102T160000
UID:2026-05-19-15-32-46@natsci.colostate.edu
DTSTAMP:20260519T153246
Description:Abstract:\nSpectroscopy has the potential to reveal the structu
 re and dynamics of complex materials\, ranging from chromophores in soluti
 on to molecular aggregates and nanomaterial heterostructures. Yet\, disent
 angling spectral signals and extracting an intuitive picture of how excita
 tions form\, move\, and exchange energy is one of the deepest and most per
 sistent challenges of physical chemistry. In this talk\, I will offer two 
 vignettes on our work developing and applying aproaches to predict and un
 derstand spectral features in molecular and nanomaterial systems. In the m
 olecular world\, I will show how our recent advances in condensed phase sp
 ectroscopy enable us to decipher a long-standing puzzle in porphyrin photo
 physics: why and how do the Q bands involved in energy transfer in photosy
 nthesis and artificial energy conversion split? In the nanomaterial world\
 , I will highlight how\, in collaboration with the Krummel and Sambur gro
 ups\, we have been able to demonstrate how the unusual photophysics of ato
 mically thin 2D materials enables hot carrier extraction for photocatalysi
 s. Then\, I will illustrate how addressing the challenge of hot carrier ex
 traction enabled us to develop a simple scheme to disentangle the signals 
 of exotic quasiparticles that explain the tunability of the optical behavi
 or of these materials as a function of potential\, laser fluence\, and tim
 e.\n&nbsp\;\n\nAbout the Speaker:\n\nProf. Montoya-Castillo obtained his B
 A in chemistry and literature with a minor in physics. He obtained his PhD
  in Chemical Physics from Columbia University\, working with Prof. David R
 eichman\, and then did his postdoc at Stanford University in the group of 
 Prof. Thomas Marland. He started his independent career at the University 
 of Colorado Boulder in 2021.\n\nAndres\\'s research centers on developing 
 and applying methods to capture the dynamics of charge and energy transfer
  in complex condensed phase environments and conformational changes underl
 ying protein folding in biophysical systems. He and his group have made co
 ntributions in fields ranging from biophysics to energy conversion and eve
 n quantum information. Andres is one of this year\\'s recipients of the DO
 E Early Career award. 4:00 pm
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