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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2708
DTSTART:20130201T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T150819Z
LAST-MODIFIED:20130128T170949Z
LOCATION:2241 Chamberlin Hall (coffee at 4:30 pm)
SUMMARY:Femtosecond hard X-ray lasers for atomic structure and biodyna
 mics\, Physics Department Colloquium\, John Spence\, Arizona State Uni
 versity
DESCRIPTION:Since the Linac Coherent Light Source (LCLS) started opera
 tion in late 2009 at SLAC we have collected femtosecond pulsed coheren
 t X-ray scattering from many molecular systems. It has been found that
  sufficiently brief X-ray pulses terminate before radiation damage com
 mences\, opening up many opportunities for new experiments in time- re
 solved imaging with atomic spatial resolution at room temperature\, in
  condensed matter physics\, materials science and biology.<br>
\n<br>

 \nI will review some of these\, including pump-probe experiments on th
 e large molecular complexes involved in photosynthesis\, and on a drug
  target molecule for sleeping sickness. A new approach to disentanglin
 g orientational disorder will also be demonstrated\, aimed at reconstr
 ucting the image of one molecule\, using the scattering from many in r
 andom orientations in solution\, without modeling\, based on angular c
 orrelation functions. Prospects for the formation of "molecular movies
 " which track chemical reactions will be outlined. I'll also describe 
 the new approaches to the phase problem which these experiments sugges
 t. A review of all this work can be found in Rev Mod Phys. 75\, 102601
  (2012).
URL:https://www.physics.wisc.edu/events/?id=2708
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