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						<h1 itemprop="headline">Molecular Physics Seminar - Steffen Meyer: &#039;Imaging the Three-Body Wavefunction of Fragmenting Triatomic Hydrogen&#039;</h1>
						
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														Wednesday 11  December 2013,
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														&nbsp;at 13:15 -  14:00
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													<p class="news-event__info__item__ical-link"><a href="/en/news/item/artikel/molecular-physics-seminar-steffen-meyer-imaging-the-three-body-wavefunction-of-fragmenting-triat-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>Molecular Physics Seminar</strong>
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<p><strong>Title</strong>: Imaging the Three-Body Wavefunction of Fragmenting Triatomic Hydrogen
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<p><strong>Speaker</strong>: Steffen Meyer, Albert-Ludwigs-Universität Freiburg, Germany
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<p><strong>Abstract</strong>:
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<p>Neutral triatomic hydrogen is the most simple polyatomic molecule, and a prototype of molecular degrees of freedom, of molecular interaction and of nonadiabatic couplings in particular. I will begin my presentation by outlining fundamental properties of this molecule and then concentrate on my current research theme and experiment in Freiburg where I study three-body fragmentation of electronically excited states of H<sub>3</sub>. My specific interest is in states with principal quantum number n = 4 which I excite using a narrowband tunable diode laser in a keV neutral beam. The excited states decay primarily by predissociation into the continuum of three neutral H atoms. Time- and position-sensitive detectors allow to record in coincidence the three slow (? 1 eV) neutral ground state hydrogen atoms which emerge in predissociation. Coincident detection of the three correlated atoms from a single molecule permits to reconstruct the centre-of-mass momentum vectors of the three hydrogen atoms. This experiment, when repeated for many molecules (typically 10<sup>4</sup>) delivers a map of momentum correlation of the three H atoms. This momentum correlation map may be regarded as an image of the modulus squared of the three-body wavefunction, at the time when the system emerges from molecular distances. As the bound state heavy-particle wavefunction is known, the observed distribution is a measure of the phase-space dependent action of nonadiabatic coupling which allows the bound state to exit into the continuum.
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<p><em>Coffee/tea will be served at 13:05</em></p>
								
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