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SUMMARY:Current Status of Ultrafast Electron Diffraction at the Laser Rese
 arch Institute
DTSTART;VALUE=DATE-TIME:20110714T150000Z
DTEND;VALUE=DATE-TIME:20110714T170000Z
DTSTAMP;VALUE=DATE-TIME:20260714T164448Z
UID:indico-contribution-5160@events.saip.org.za
DESCRIPTION:Speakers: Ilana Boshoff (University of Stellenbosch (Laser Res
 earch Institute))\nWe will show the changes and improvements made to the U
 ltrafast Electron Diffraction setup which led us to doing the first time-r
 esolved experiments.  \nWe have implemented beam tracking and correction s
 ystems in both the pump and probe beams\, ensuring that we keep spatial ov
 erlap during a measurement.   By using a different cathode and metal coati
 ng we were able to improve the electron efficiency.  These improvements en
 able us to do measurements of up to 20 hours without losing the electron s
 ignal.\nPreciously a commercial 8-bit Nikon camera was used to gather data
 .  We have switched to a 16-bit EHD CCD Camera to increase the amount of i
 nformation we get from one data point.\nPrevious problems concerning the b
 ackground were solved by reducing the electron energy and applying a small
  voltage to the sample holder to prevent photo electrons from reaching the
  detector.\nA big challenge in UED is the preparation of thin (<100nm) sam
 ples.  We will show the techniques we use to overcome this problem.\n\nhtt
 ps://events.saip.org.za/event/7/contributions/5160/
LOCATION: Asteria
URL:https://events.saip.org.za/event/7/contributions/5160/
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