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<p class="MsoNormal">Hello everyone,<o:p></o:p></p>
<p class="MsoNormal">The talk is now beginning! Hope you can join us.<o:p></o:p></p>
<p class="MsoNormal">Thanks!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="http://opticalscience.osu.edu/"><span style="color:windowtext;text-decoration:none"><img border="0" width="466" height="93" style="width:4.85in;height:.9666in" id="Picture_x0020_2" src="cid:image001.jpg@01D8BBA1.BF5B7380"></span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:black;background:white">The Institute for Optical Science aims to create a
<b>community of researchers</b> in the optical sciences extending beyond traditional academic boundaries identifying strengths in interdisciplinary photon science research.</span><span style="font-family:"Tahoma",sans-serif;background:white"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Please join us
<b><span style="color:#C00000">Thursday morning, Sept 1, 2022 at <u>10:00am</u> </span>
</b><span style="color:#C00000">(EDT)</span><b> </b>for a hybrid webinar hosted by The Institute for Optical Science.<span style="color:#C00000">
</span>Dr.</span> <span style="font-family:"Tahoma",sans-serif">Patrick Rupprecht (Max-Plank) will discuss
<i>“From femtoseconds to femtometers – controlling quantum dynamics in molecules using core-level transient absorption spectroscopy.” </i>The webinar will be
<b>virtual only</b> (see Zoom link below).<i><o:p></o:p></i></span></p>
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Description automatically generated with medium confidence" v:shapes="Picture_x0020_5"><![endif]><u><span style="font-family:"Tahoma",sans-serif">Abstract</span></u><span style="font-family:"Tahoma",sans-serif">:
Core-level absorption spectroscopy has proven to be a valuable tool to gain a deeper understanding of quantum dynamics in atoms, molecules and solid-state materials on the femtosecond time scale. Especially the capability of x-ray transient absorption spectroscopy
(XTAS) to elucidate dynamics in neutral and thus chemically highly relevant molecules stands out.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">In this talk I will present a novel few-cycle laser source and transient absorption setup at the Max Planck Institute for Nuclear Physics in Heidelberg, Germany. In addition, first results of
purely electronic as well as structural control within molecules using intense femtosecond laser pulses are discussed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">The performed XTAS experiments are enabled by a laser source providing center-wavelength tunable few-cycle pulses in the 1-2 µm short-wavelength infrared (SWIR) regime. These pulses drive high-order
harmonic generation (HHG) resulting in measured soft x-ray (SXR) spectra up to 200 eV photon energy. In the first presented experiment, the quantum-mechanical part of the electron-electron interaction, the exchange interaction, is controlled by perturbing
gaseous SF6 molecules with SWIR pulses of variable intensity (≤ 2.2×1014 W/cm2) [1]. A simultaneous HHG probe of the sulfur L2,3 absorption edge reveals a change in the relative oscillator strengths within a spin-orbit-split doublet resonance. We trace this
branching-ratio [2,3] alteration back to an exchange-energy increase of up to 50% by employing a theoretical toy-model. These findings are further supported by an ab-initio quantum many-body calculation based on the QUANTY code [4]. In a second experiment,
time-resolved x-ray absorption spectroscopy is used to elucidate vibrational molecular dynamics in the perturbative limit. Here, the SWIR pulse precedes the SXR and induces molecular vibrations via nonresonant impulsive stimulated Raman excitation. XTAS can
trace vibrational dynamics as imprinted in the resonance-energy shift due to the different involved potential energy curves [5]. In our experiment, we were capable of inducing and measuring the fundamental vibrational breathing mode (T = 43 fs) within an ensemble
of SF6 molecules with an amplitude of only 50 fm and an unprecedented precision of 14 fm [6]. With the help of a combined quantum many-body and classical simulation, the electronic signature in temporal overlap can be disentangled from the vibrational one
and electronic-vibrational coupling dynamics are analyzed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">These XTAS studies pave the way for new ultrafast chemical control schemes as well as molecular vibrational precision metrology.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">[1] Rupprecht, et al. Laser control of electronic exchange interaction within a molecule. Phys. Rev. Lett. 128, 153001 (2022).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">[2] Onodera, Toyozawa. Excitons in alkali halides. J. Phys. Soc. Jpn. 22, 833 (1967).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">[3] Thole, van der Laan. Branching ratio in x-ray absorption spectroscopy. Phys. Rev. B 38, 3158 (1988).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">[4] M.W. Haverkort, et al. Multiplet ligand-field theory using Wannier orbitals, Phys. Rev. B 85, 165113 (2012).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">[5] Hosler, Leone. Characterization of vibrational wave packets by core-level high-harmonic transient absorption spectroscopy. Phys. Rev. A 88, 023420 (2013).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">[6] Rupprecht, et al. Resolving vibrations in a polyatomic molecule with femtometer precision. arXiv 2207.01290 (2022).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Join the webinar here:
</span><a href="https://osu.zoom.us/j/91034383991?pwd=aU1WbVd6dU9XUzg2MnVodWt3TEo1QT09"><span style="font-family:"Tahoma",sans-serif">https://osu.zoom.us/j/91034383991?pwd=aU1WbVd6dU9XUzg2MnVodWt3TEo1QT09</span></a><span style="font-family:"Tahoma",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif">Webinar ID: 910 3438 3991, Passcode: 233122<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#1F4E79;background:white">Thank you for your time,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Mistral;color:#1F4E79;background:white"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:Mistral;color:#1F4E79;background:white">Jessi</span><span style="font-family:"MV Boli";color:#222222"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"MV Boli";color:#222222"><img border="0" width="300" height="43" style="width:3.125in;height:.45in" id="Picture_x0020_3" src="cid:image005.png@01D8BBA1.BF5B7380" alt="Small Logo"></span><span style="font-family:"MV Boli";color:#222222"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#C00000;background:white">Jessica Middleton</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black;background:white">,
</span><a href="mailto:middleton.85@osu.edu"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;background:white">middleton.85@osu.edu</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"><br>
<span style="color:black;background:white">(614) 292-2670</span><span style="background:white"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black;background:white">Office Administrator, Institute for Optical Science</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#222222"><br>
<span style="background:white">Room 4112</span><br>
</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#C00000;background:white">Physics Dept, The Ohio State University</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#222222"><br>
<span style="background:white">191 W. Woodruff Ave, Columbus, OH 43210<o:p></o:p></span></span></p>
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