BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:4
UID:UW-Physics-Event-5088
DTSTART:20190422T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T084940Z
LAST-MODIFIED:20190418T132525Z
LOCATION:2103 Chamberlin Hall
SUMMARY:Photoinduced reaction mechanisms in molecular systems probed w
ith elemental specificity via ultrafast X-ray spectroscopy\, Physics D
epartment Colloquium\, Nils Huse\, Hamburg University
DESCRIPTION:Understanding the interplay of structural\, electronic and
spin degrees of freedom is paramount for mechanistic insights into ho
w matter transforms upon external stimuli such as light. The elemental
specificity of X-ray spectroscopy provides unique complimentary infor
mation to vibrational and electronic spectroscopy or non-resonant scat
tering techniques when studying reaction mechanisms in chemical and ma
terials science. This can be especially useful for metal atoms and the
ir nearest neighbors in transition-metal complexes [1\,2] or so-called
heteroatoms in functional groups of organic molecules [3\,4] where sp
ecific atomic sites are of particular importance for the physical and
chemical properties of molecular or solid state systems. I will introd
uce basic concepts of X-ray absorption spectroscopy and RIXS\, the X-r
ay analogue to resonant Raman scattering\, as methods to probe electro
nic structure on ultrafast time scales before presenting two examples
of photo-induced reactions to show how X-ray spectroscopy of ligand- a
nd heteroatoms can (i) unravel the role of ligand-field states in tran
sition-metal complexes and (ii) identify transient excited states and
new species in sulfur-containing molecules.
\n[1] B. Van Kuike
n et al.\, J. Phys. Chem. Lett. 7\, 465 (2016)
\n[2] A. A. Cordone
s et al.\, Nat. Comm. 9\, 1989 (2018)
\n[3] M. Ochmann et al.\, J.
Am. Chem. Soc. 139\, 4789 (2017)
\n[4] M. Ochmann et al.\, J. Am.
Chem. Soc. 140\, 6554 (2018)
\n
URL:https://www.physics.wisc.edu/events/?id=5088
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