12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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Current Status of Ultrafast Electron Diffraction at the Laser Research Institute

Presented by Ms. Ilana BOSHOFF on 14 Jul 2011 from 17:00 to 19:00
Type: Poster Presentation
Session: Poster2
Track: Track C - Lasers, Optics and Spectroscopy


<p>We will show the changes and improvements made to the Ultrafast Electron Diffraction setup which led us to doing the first time-resolved experiments. We have implemented beam tracking and correction systems in both the pump and probe beams, ensuring that we keep spatial overlap during a measurement. By using a different cathode and metal coating we were able to improve the electron efficiency. These improvements enable us to do measurements of up to 20 hours without losing the electron signal. Preciously 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 information we get from one data point. Previous problems concerning the background were solved by reducing the electron energy and applying a small voltage to the sample holder to prevent photo electrons from reaching the detector. A big challenge in UED is the preparation of thin (<100nm) samples. We will show the techniques we use to overcome this problem.

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Short Paper



Room: Asteria

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