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SUMMARY:Spin-state photo-switching dynamics in molecular crystals investig
 ated by time-resolved optical and x-ray techniques
DTSTART:20121108T133000
DTEND:20121108T143000
DTSTAMP:20260511T062155Z
UID:23837cf700ab293d2482345a936701e98002d85f15bc954792ab77e7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Eric Collet\, Institut de Physique de Rennes 1-CNRS\nThe
  current challenge in control science is not only to observe matter on eve
 r smaller scale but also to direct its functionality at the relevant lengt
 h\, time and energy scales. It is the aim of light-driven transformations\
 , to force the matter towards a new state far from thermal equilibrium. Ph
 otoinduced transition occurring in multi-stable materials involves differe
 nt degrees of freedom at the molecular level as well as macroscopic propag
 ating or diffusive effects (shockwave\, thermal heating…)\, each of them
  being associated with a typical timescale. Understanding the physical mec
 hanisms involved in the transformation induced by an ultra-short femtoseco
 nd laser pulse in solids is only emerging. Recent investigations performed
  by femtosecond optical spectroscopy\, x-ray diffraction or XANES will be 
 presented. In addition to the sub-picosecond molecular transformation\, ot
 her slower effects of elastic or thermal nature should be considered for d
 escribing the macroscopic response\, as different processes spanning from 
 molecular to material scales are linked together.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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