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SUMMARY:Determining the optical properties of atmospheric carbon species u
 sing low-loss EELS - Dr Duncan Alexander\, École Polytechnique Fédérale
  de Lausanne\, Switzerland
DTSTART:20091013T140000Z
DTEND:20091013T150000Z
UID:TALK20514@talks.cam.ac.uk
CONTACT:Dr Jonathan Barnard
DESCRIPTION:The principle for determining the optical properties of materi
 als from the low-loss electron energy-loss spectrum in the TEM has been kn
 own for many years. This technique promises the ability to identify the op
 tical properties of particles and structures with a spatial resolution on 
 the nano-scale. Moreover\, the advent of monochromated electron sources an
 d improved spectrometers have created the instrumental capabilities requir
 ed for studying the energy-loss spectrum in the 1.8-3.1 eV energy-loss ran
 ge corresponding to visible light. However\, factors such as Cherenkov rad
 iation and surface plasmon resonances create significant challenges for th
 e application of this technique. Here\, these challenges will be discussed
  with respect to the aim of determining the optical properties of sub-micr
 ometre atmospheric light-absorbing carbon species\, as will the reasons fo
 r the successful identification and optical property determination of atmo
 spheric brown carbon spheres. Recognition of this aerosol species will be 
 consistent with the aim of improving the assumptions and accuracy of aeros
 ol data for climate models.\n
LOCATION:Pfizer Seminar Room [4th floor]\, Materials Science and Metallurg
 y\, Department of
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