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BEGIN:VEVENT
SUMMARY:Femtosecond Time-resolved Imaging of Chiral Molecules
DTSTART:20151022T163000
DTEND:20151022T173000
DTSTAMP:20260429T121108Z
UID:282baa479580818d13de8a08e7db1061edf73f9333b3d6490c4e36d7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Henrik Stapelfeldt\nDepartment of Chemistry\, Aarhus Universit
 y\, Denmark\nI will discuss how it is possible to directly image torsion o
 f chiral molecules\, consisting of two benzene rings linked by a carbon-ca
 rbon single bond\, on their natural femtosecond time-scale. The torsional 
 motion is of special importance because it is the fundamental reaction coo
 rdinate linking the left-handed and the right-handed mirror forms of the c
 hiral molecule.\nExperimentally\, the molecules are initially fixed-in-spa
 ce by laser-induced 3-dimensional adiabatic alignment to provide the best 
 view of them. Next\, torsion is induced by a femtosecond pump pulse and mo
 nitored in real time by Coulomb exploding the molecules with a delayed\, i
 ntense femtosecond probe pulse and detecting the emission direction of the
  ionic fragments [1].\nThe torsional motion occurs with a period of 1.3 ps
  and an amplitude of 3 degrees which can be doubled by using two optimally
  synchronized pump pulses [2]. The torsion persists for more than 150 ps c
 orresponding to approximately 120 torsional oscillations.\nProspect for us
 ing the method to determine the absolute configuration of chiral molecules
  will also be discussed [3].
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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