BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//TYPO3/NONSGML News system (news)//EN
BEGIN:VEVENT
UID:news-26029@phys.au.dk
DTSTAMP:20210928T101504Z
DTSTART:20141022T131500Z
DTEND:20141022T140000Z
END:VEVENT
END:VCALENDAR




<div class="news news-single">
	<div class="article" itemscope="itemscope" itemtype="http://schema.org/Article">
		
	
			<script type="text/javascript">
				const showAllContentLangToken = "Vis alt indhold ";
			</script>

			
			

			<article class="typo3-delphinus delphinus-gutters">

				<!-- News PID: 83035 - used for finding folder/page which contains the news / event -->
				<!-- News UID: 26029 - the ID of the current news / event-->

				<div class="news-event">
					<div class="news-event__header">
						<!-- Categories -->
						
							<span class="text--stamp">
<!-- categories -->
<span class="news-list-category">
	
		
	
		
	
		
	
</span>

</span>
						

						<!-- Title -->
						<h1 itemprop="headline">General Physics Colloquium - Martin Wolf: &#039;Ultrafast Dynamics of Photoinduced Surface Reactions and Phase Transitions in Solids&#039;</h1>
						
					</div>

					

					<div class="news-event__content">

						<!-- Events info box -->
						
								

								<div class="news-event__info theme--dark" id="event-info">
									<h2 class="screenreader-only">Oplysninger om arrangementet</h2>

									
											<!--- Same date -->
											<div class="news-event__info__item news-event__info__item--time">
												<h3 class="news-event__info__item__header text--label-header">Tidspunkt</h3>
												<div class="news-event__info__item__content">
													<span class="u-avoid-wrap">
														Onsdag 22. oktober 2014,
													</span>
													<span class="u-avoid-wrap">
														&nbsp;kl. 15:15 -  16:00
													</span>
													<p class="news-event__info__item__ical-link"><a href="/aktuelt/nyhed/artikel/general-physics-colloquium-martin-wolf-ultrafast-dynamics-of-photoinduced-surface-reactions-and?tx_news_pi1%5Bformat%5D=ical&amp;type=9819&amp;cHash=c4b0a2df6740e9b7d2bcaab59a5befd1">Tilføj til kalender</a></p>
												</div>
											</div>
										

									<!-- Location detailed -->
									
											<!-- Location Simple -->
											
												<div class="news-event__info__item">
													<h3 class="news-event__info__item__header text--label-header">Sted</h3>
													<div class="news-event__info__item__content">
														<p>Fys. Aud. </p>
													</div>
												</div>
											
										

									<!-- Organizer detailed -->
									
											<!-- Organizer Simple -->
											
										

									<!-- Price -->
									

									<!-- Event link -->
									

									<!-- Registration -->
									
								</div>
							

						
							<!-- Media -->
							
								



							
						

						
							<div class="news-event__content__text">
								<span class="text--byline" id="byline">
									

									<!-- Author -->
									
										<span itemprop="author" itemscope="itemscope" itemtype="http://schema.org/Person">
											
													Af
												

											
													<a href="mailto:karin.vittrup@phys.au.dk">
														<span itemprop="name">Karin Vittrup</span>
													</a>
												
										</span>
									
								</span>

								

									<!-- Body text -->
									<h2>General Physics Colloquium</h2>
<p>&nbsp;
</p>
<p><strong>Ultrafast Dynamics of Photoinduced Surface Reactions and Phase Transitions in Solids</strong>&nbsp;
</p>
<p>&nbsp;
</p>
<p>Martin Wolf
</p>
<p>Fritz-Haber-Instiut der Max-Planck Gesellschaft
</p>
<p>&nbsp;
</p>
<p>Electronic excitations at surfaces and in solids can lead to rich variety of processes, which often include transfer of energy of the electronic system into nuclear motion. Femtosecond laser excitation of metals or more complex materials results in a highly non-equilibrium electron distribution, which may induce chemical reactions of adsorbed molecules (surface femtochemistry) or lead to displacive excita­tion of coherent phonons or ultrafast phase transitions in solids. Both types of processes occur on ultrafast (femto- to pico­second) timescales and are accompanied by pronounced changes of the electronic structure.
</p>
<p>In this talk, I will discuss different experimental approaches to probe such tran­sient electronic structure changes on ultrafast timescales by employing (i) time-resolved resonant inelastic x-ray scattering (trRIXS) and (ii) time- and angle-resolved photoelectron spectroscopy (trARPES). Experiments performed with trRIXS at the X-ray free electron laser LCLS provide direct insight into the changes of the chemical bonds after photoexcitation (like&nbsp; CO or O on Ru(001)), leading to a pronounced bond weakening and CO desorption or oxidation. These studies provide new insights into dynamics and details of the potential energy landscape.
</p>
<p>Furthermore, we have investigated the mechanism of the photoinduced insulator-to-metal transition in a prototypical charge-density wave (CDW) system (RTe<sub>3</sub>, R=Te, Dy). In CDW materials a periodic lattice distortion leads to the opening of an electronic gap at the Fermi surface at low temperatures. trARPES allows for probing directly the transient evolution of the electronic structure and collective phonon dynamics after photoexcitation through their influence on the electronic band structure. This enables a systematic study of the opening and closing of the CDW gap and the dynamics of the CDW amplitude mode during the photo-induced non-equilibrium phase transition.
</p>
<p>&nbsp;
</p>
<p><em>Wine and cheese will be served at 4 PM</em></p>
								
							</div>
						
					</div>

					
						<!-- Content elements -->
						
					
				</div>
			</article>

			
				
				
			

			<!-- related things -->
			
		

	</div>
</div>