BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Ultrafast Charge Migration in Biological Building Blocks
DTSTART:20141106T163000
DTEND:20141106T173000
DTSTAMP:20260916T043416Z
UID:55bababe98fb1bc311397ad8ce8caf18fde306db0cfa401a6397a283
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Jason Greenwood\,\nCentre for Plasma Physics\, Queen’s Un
 iversity Belfast\nWhen a complex molecule or molecular complex is suddenly
  disturbed from equilibrium\, when for instance a photon is absorbed or an
  electron is ionized by energetic radiation\, it is left in a superpositio
 n of electronically excited states. The evolution of this electronic wavep
 acket then results in charge separation/transfer which can be the initiato
 r for subsequent chemical processes. The initial motion of the charge is e
 xpected to occur on attosecond to few femtosecond timescales before coupli
 ng with the nuclear motion modifies the wavepacket eventually resulting in
  the formation of a stationary state and localisation of the charge.\nTo o
 bserve this intramolecular\, coherent electron dynamics\, known as charge 
 migration\, in a nanoscale structure is very challenging given the complex
 ity of the problem and the timescales involved. With the advent of attosec
 ond laser technology in the last 10 years it is now possible to generate p
 ulses which are short enough to resolve these processes in the time domain
 . In this talk I will describe work which we have undertaken at the Polite
 cnico Milano Attosecond Laser Facility\, which has for the first time allo
 wed us to observe ultrafast charge oscillations in a large molecule – in
  this case the amino acid phenylalanine[1\,2]. \n[1] Observation of Ultra
 fast Charge Migration in an Amino Acid\,\nL. Belshaw et al.\, J. Chem. Phy
 s. Lett.\, 3\, 3751−3754 (2012)\n[2] Ultrafast Electron Dynamics in Phen
 ylalanine Initiated by Attosecond Pulses\nF. Calegari et al.\, Science\, 3
 46\, 336-339 (2014)
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR