Paul Corkum: Joint Atomic Physics Colloquium
Institute for Theoretical Atomic, Molecular and Optical Physics (ITAMP)/ Harvard
University Department of Physics Joint Atomic Physics Colloquium
________________
Speaker: Professor Paul Corkum, University of Ottawa, National Research Council (Canada)
Title: Laser Induced Molecular Imaging
Time: Wednesday, May 4, 2011 @ 4:30 p.m. - Tea @ 4:00 p.m.
Place: Jefferson 356, Harvard Physics
Sponsored by Institute for Theoretical Atomic, Molecular and Optical
Physics ITAMP (
http://itamp.harvard.edu) and Harvard Physics Department
(
http://www.physics.harvard.edu)
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Abstract:
New methods for probing molecules and their dynamics arise from the highly nonlinear
interaction between short infrared pulses and matter. One new method is laser induced
tunnelling. I will show that tunnelling accurately describes ionization in short infrared
light pulses [1] and that measuring the angle dependent ionization probability of a
molecule is analogous to measuring the position dependent tunnelling rate on a surface
with an STM [2]. A second is high harmonic spectroscopy. When tunnel ionization occurs in
a moderate density gas, high harmonics are produced. The high harmonic signal encodes
information similar to that available from photoelectron spectroscopy but with coherence.
I will show how high harmonic spectroscopy can be used to follow molecular dissociation of
Br2 [3] and to probe features of asymmetric molecules such as CO [4]. [1] L. Arissian et
al, Phys. Rev. Lett. 105, 133002 (2010) [2] H. Akagi et al, Science 325, 1364 (2009) [3]
H. Worner et al, Nature 466, 603 (2010) [4] E. Frumker et al, unpublished results
--
Lisa Bastille • Administrative Coordinator • ITAMP
Harvard - Smithsonian Center for Astrophysics • 60 Garden Street, MS 14 • Cambridge, MA
02138-1516 • phone: (617) 495-9524 • fax: (617) 495-5970 • email:
lbastill(a)cfa.harvard.edu
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