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						<h1 itemprop="headline">Lecture by the 2016 Honorary Doctor at Science and Technology, AU - Paul Corkum: Probing quantum systems from the inside – on the attosecond time scale</h1>
						
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														Thursday  8  September 2016,
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														&nbsp;at 15:15 -  16:00
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													<p class="news-event__info__item__ical-link"><a href="/en/news/item/artikel/lecture-by-the-2016-honorary-doctor-at-science-and-technology-au-paul-corkum-probing-quantum-sys-1?tx_news_pi1%5Bformat%5D=ical&amp;type=9819&amp;cHash=c4b0a2df6740e9b7d2bcaab59a5befd1">Add to calendar</a></p>
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														<span itemprop="name">Grete Flarup</span>
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									<p><strong>Speaker</strong>: Paul Corkum, Joint Attosecond Science Lab University of Ottawa and National Research Council of Canada
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<p><strong>Title</strong>: Probing quantum systems from the inside – on the attosecond time scale
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<p><strong>Time and place</strong>: Thursday September 8, AUD I, 1514-213, 15:15
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<p><strong>Abstract</strong>: 
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<p>Attosecond pulses are generated by electrons that are extracted from a quantum system by tunneling in an intense light pulse and travel through the continuum.&nbsp; Portions of each electron wave packet are forced to re-collide with its parent ion by the oscillating force of the time dependent electric field from the light pulse.&nbsp;&nbsp; Upon re-collision, the electron and ion can recombine, emitting VUV or soft X-ray radiation.&nbsp; 
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<p>Since nonlinear optics underlies every ultrafast pulse that we create and every ultrafast measurement that we perform in chemistry, physics or biology, a new nonlinear process is bound to be important.&nbsp; If we ensure that the intense driving pulse only permits re-collision within a fraction of a light period, in rare gas atoms re-collision generates the world’s shortest pulses (currently ~ 65 x 10<sup>-18</sup> sec).&nbsp; If we use a mid-infrared driver pulse, it can also generate coherent soft X-ray radiation by combining 1000s of infrared photons into one with photon energy &gt; 1 keV.&nbsp; 
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<p> But the re-collision electron, with wavelength in the 3-0.3 Ångstrøm range, is also a probe of structure.&nbsp; In semiconductors we can measure the band structure of the material in which the process occurs.&nbsp; Band structure information is encoded in the emitted light – effectively an inverse photoelectron spectroscopy.&nbsp; Using small molecules, the emitted spectrum contains the information needed to image the structure of the wave function of the orbital (or orbitals) from which the re-collision electron was taken.&nbsp; As time permits the talk will cover these issues.
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<p><em>Coffee in the foyer at 15:00</em>
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<p>Henrik Stapelfeldt</p>
								
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