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SUMMARY:Electron Microscopy – Electromagnetic Frontiers - Prof. A Howie 
 ( Cavendish Laboratory\, Cambridge University)
DTSTART:20160406T080000Z
DTEND:20160406T090000Z
UID:TALK65503@talks.cam.ac.uk
CONTACT:Dr Christopher John Edgcombe
DESCRIPTION:The concept of J.J. Thomson’s classical point electron has p
 roved good enough for most of magnetic lens-based electron optics includin
 g the recent revolution in aberration correction.  The wave nature of the 
 electron\, discovered by G.P. Thomson as well as Davisson and Germer\, was
  employed in other advances in electron microscopy such as diffraction con
 trast and structure imaging\, electron holography and the revolutionary in
 troduction of the field emission tunnelling tip.  By comparison\, we have 
 found it much harder to harness the spin of Dirac’s electron for electro
 n imaging.  \nEven more remote from the electron microscopist’s tool box
  is the concept of Feynman’s electron interacting only through the creat
 ion and annihilation of virtual photons.  Nevertheless\, progressing throu
 gh scanning electron microscopy with the cathodolumenescence signal\, in p
 hoto-emission electron microscopy\, in tip-enhanced near field microscopy 
 and in super-resolution fluorophore optical imaging\, the role of the phot
 on in transforming many branches of microscopy is exploding.  This situati
 on will be reviewed and the prospects for optical pump probe electron micr
 oscopy will be discussed.\n
LOCATION:Centre for Mathematical Sciences\, meeting room MR2
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