Christian D. Ott
Max Planck Society
Gravitational collapsePhysicsSupernovaAstronomyStarsAtomic physicsNeutrinoGravitational waveNeutron starInstabilityCore (optical fiber)Accretion (astrophysics)LIGOType II supernovaBinary black holeSpectroscopyNumerical relativityAstrophysicsCollapse (topology)Classical mechanicsBlack hole
Publications 275
#1Marc Rebholz (MPG: Max Planck Society)H-Index: 5
#2Thomas Ding (MPG: Max Planck Society)H-Index: 9
Last. Paul Birk (MPG: Max Planck Society)H-Index: 6
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In this work, we use an extreme-ultraviolet (XUV) free-electron laser (FEL) to resonantly excite the I: 4d5/2-σ∗ transition of a gas-phase di-iodomethane (CH2I2) target. This site-specific excitation generates a 4d core hole located at an iodine site, which leaves the molecule in a well-defined excited state. We subsequently measure the time-dependent absorption change of the molecule with the FEL probe spectrum centered on the same I: 4d resonance. Using ab initio calculations of absorption spe...
#1Patrick Rupprecht (MPG: Max Planck Society)H-Index: 3
#2Lennart Aufleger (MPG: Max Planck Society)H-Index: 3
Last. Thomas Pfeifer (MPG: Max Planck Society)H-Index: 38
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We show that absorption spectra of aluminum chloride phthalocyanine (AlClPc) in the liquid phase can be dynamically modified through the time-resolved interaction with a second laser pulse during a time window on the order of 100 fs. The observed effects can be explained by laser-induced coherent coupling dynamics between the ground state and a bath of excited states as reproduced by a few-level toy model. The presented results help to understand how intense laser fields interact with complex mo...
#1Thomas DingH-Index: 9
#2Marc RebholzH-Index: 5
Last. Thomas PfeiferH-Index: 38
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The emergence of ultra-intense extreme-ultraviolet (XUV) and X-ray free-electron lasers (FELs) has opened the door for the experimental realization of non-linear XUV and X-ray spectroscopy techniques. Here we demonstrate an experimental setup for an all-XUV transient absorption spectroscopy method for gas-phase targets at the FEL. The setup combines a high spectral resolving power of E/ΔE ≈ 1500 with sub-femtosecond interferometric resolution, and covers a broad XUV photon-energy range between a...
#1Yu HeH-Index: 2
#2Zuoye LiuH-Index: 7
Last. Bitao HuH-Index: 12
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Time-resolved buildup of a Fano resonance in a macroscopic gaseous medium is theoretically studied by attosecond transient absorption spectroscopy. An intense near-infrared field is employed as an adjustable gate to confine the temporal dynamics, enabling one to resolve the line-shape formation in real time. Beyond the region where the single-atom approximation holds, we observe the emergence of spectral spikes with narrow linewidths for certain time delays and propagation distances, which repre...
#1Daria KolbasovaH-Index: 1
Last. Robin SantraH-Index: 60
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#1Kilian Peter Heeg (MPG: Max Planck Society)H-Index: 9
#2Andreas Kaldun (MPG: Max Planck Society)H-Index: 11
Last. Jörg Evers (MPG: Max Planck Society)H-Index: 27
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Coherent control of quantum dynamics is key to a multitude of fundamental studies and applications1. In the visible or longer-wavelength domains, near-resonant light fields have become the primary tool with which to control electron dynamics2. Recently, coherent control in the extreme-ultraviolet range was demonstrated3, with a few-attosecond temporal resolution of the phase control. At hard-X-ray energies (above 5–10 kiloelectronvolts), Mossbauer nuclei feature narrow nuclear resonances due to ...
5 CitationsSource
#1Thomas Ding (MPG: Max Planck Society)H-Index: 9
#2Marc Rebholz (MPG: Max Planck Society)H-Index: 5
Last. Thomas Pfeifer (MPG: Max Planck Society)H-Index: 38
view all 24 authors...
High-intensity ultrashort pulses at extreme ultraviolet (XUV) and x-ray photon energies, delivered by state-of-the-art free-electron lasers (FELs), are revolutionizing the field of ultrafast spectroscopy. For crossing the next frontiers of research, precise, reliable and practical photonic tools for the spectro-temporal characterization of the pulses are becoming steadily more important. Here, we experimentally demonstrate a technique for the direct measurement of the frequency chirp of extreme-...
7 CitationsSource