Search results for: Thomas Pfeifer

Items from 1 to 20 out of 27 results

article

Laserlicht steuert Elektronen‐Wechselwirkung

Patrick Rupprecht, Christian Ott, Thomas Pfeifer, Maurits W. Haverkort

Physik in unserer Zeit > 53 > 4 > 164 - 165

Lichtblitze verschiedener Intensität können die quantenmechanische Komponente der Elektron‐Elektron‐Wechselwirkung gezielt beeinflussen. Diese kontrollierte Austauschwechselwirkung zeigt sich durch spektroskopische Messungen an Schwefelhexafluorid‐Molekülen mit ultrakurzen Laserpulsen, durchgeführt am Max‐Planck‐Institut für Kernphysik in Heidelberg.

article

Reaction microscope endstation at FLASH2

Georg Schmid, Kirsten Schnorr, Sven Augustin, Severin Meister, more

Journal of Synchrotron Radiation > 26 > 3 > 854 - 867

A reaction microscope dedicated to multi‐particle coincidence spectroscopy on gas‐phase samples is installed at beamline FL26 of the free‐electron laser FLASH2 in Hamburg. The main goals of the instrument are to follow the dynamics of atoms, molecules and small clusters on their natural time‐scale and to study non‐linear light–matter interaction with such systems. To this end, the reaction microscope...

article

Discovery and evaluation of Cav3.2-selective T-type calcium channel blockers

Olivier Bezençon, Luboš Remeň, Sylvia Richard, Catherine Roch, more

Bioorganic & Medicinal Chemistry Letters > 2017 > 27 > 23 > 5326-5331

We identified and characterized a series of pyrrole amides as potent, selective Ca_v3.2-blockers. This series culminated with the identification of pyrrole amides 13b and 26d, with excellent potencies and/or selectivities toward the Ca_v3.1- and Ca_v3.3-channels. These compounds display poor physicochemical and DMPK properties, making their use difficult for in vivo applications. Nevertheless, they are...

article

Discovery and evaluation of Cav3.1-selective T-type calcium channel blockers

Olivier Bezençon, Luboš Remeň, Sylvia Richard, Catherine Roch, more

Bioorganic & Medicinal Chemistry Letters > 2017 > 27 > 23 > 5322-5325

We identified and characterized a series of pyrazole amides as potent, selective Ca_v3.1-blockers. This series culminated with the identification of pyrazole amides 5a and 12d, with excellent potencies and/or selectivities toward the Ca_v3.2- and Ca_v3.3-channels. This compound displays poor DMPK properties, making its use difficult for in vivo applications. Nevertheless, this compound as well as analogous...

article

Towards precision measurements on highly charged ions using a high harmonic generation frequency comb

Janko Nauta, Andrii Borodin, Hans B. Ledwa, Julian Stark, more

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions... > 2017 > 408 > C > 285-288

Highly charged ions (HCI) offer many advantages over neutral and singly charged ions for probing fundamental physics. Recently they have been proposed as candidates for novel frequency standards. The project presented here aims at studying HCI with high precision in the extreme ultraviolet (XUV) region, where many of their transitions are located. To this end, an XUV light source is being developed,...

chapter

Ultrafast molecular structure determination of fragmentation pathways of acetylene

Benjamin Wolter, Michael G. Pullen, Anh-Thu Le, Matthias Baudisch, more

2016 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2016 Conference on Lasers and Electro-Optics (CLEO)

We apply laser-induced electron diffraction imaging driven by mid-IR electric waveforms towards probing molecular dynamics at few-femtosecond temporal resolutions. Combined with coincidence detection we can extract structural information of fragmentation pathways of acetylene.

chapter

Optimal Control of Atomic, Molecular and Electron Dynamics with Tailored Femtosecond Laser Pulses

Tobias Brixner, Thomas Pfeifer, Gustav Gerber, Matthias Wollenhaupt, more

Femtosecond Laser Spectroscopy > 225-266

With the invention of the laser, the dream was realized to actively exert control over quantum systems. Active control over the dynamics of quantum mechanical systems is a fascinating perspective in modern physics. Cleavage and creation of predetermined chemical bonds, selective population transfer in atoms and molecules, and steering the dynamics of bound and free electrons have been important milestones...

chapter

Fano resonances in the time domain

Andreas Kaldun, Christian Ott, Alexander Blattermann, Thomas Ding, more

2015 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2015 Conference on Lasers and Electro-Optics (CLEO)

The Fano phase formalism enables measurement and control of phase and amplitude of an emitting dipole. Here, we use this formalism to measure and understand the dynamics of bound states in strong laser fields.

article

Surface plasmon assisted electron acceleration in photoemission from gold nanopillars

Phillip M. Nagel, Joseph S. Robinson, Bruce D. Harteneck, Thomas Pfeifer, more

Chemical Physics > 2013 > 414 > Complete > 106-111

Electron photoemission from lithographically prepared gold nanopillars using few-cycle, 800nm laser pulses is measured. Electron kinetic energies are observed that are higher by up to tens of eV compared to photoemission from a flat gold surface at the same laser intensities. In addition, ionization from the nanopillar sample scales like a two-photon process, while three photons are needed to overcome...

article

System design and process layout for a SOFC micro-CHP unit with reduced operating temperatures

Thomas Pfeifer, Laura Nousch, Dick Lieftink, Stefano Modena

International Journal of Hydrogen Energy > 2013 > 38 > 1 > 431-439

Anode-supported cells (ASC) are considered as a promising SOFC technology for achieving higher power densities at significantly reduced operating temperatures. Thereby it is commonly expected to enhance both the profitability and durability of fuel cell systems in real world applications. In the collaborative project LOTUS, a micro-CHP system prototype will be developed and tested based on a novel...

article

Cholesteryl ester accumulation and accelerated cholesterol absorption in intestine-specific hormone sensitive lipase-null mice

Sascha Obrowsky, Prakash G. Chandak, Jay V. Patankar, Thomas Pfeifer, more

BBA - Molecular and Cell Biology of Lipids > 2012 > 1821 > 11 > 1406-1414

Hormone sensitive lipase (HSL) regulates the hydrolysis of acylglycerols and cholesteryl esters (CE) in various cells and organs, including enterocytes of the small intestine. The physiological role of this enzyme in enterocytes, however, stayed elusive. In the present study we generated mice lacking HSL exclusively in the small intestine (HSLiKO) to investigate the impact of HSL deficiency on intestinal...

chapter

Two-dimensional CEP interferometry

Christian Ott, Michael Schonwald, Philipp Raith, Andreas Kaldun, more

2012 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2012 Conference on Lasers and Electro-Optics (CLEO)

Carrier-envelope phase (CEP) control combined with spectral interferometry (CEPSI) is applied to strong-field high-harmonic generation in order to separate electronic quantum paths resulting in multiple attosecond pulses. 54±16 as pulse timing changes are measured.

chapter

Fractional high-order harmonic combs and energy tuning by split-spectrum field synthesis

Philipp Raith, Christian Ott, Christopher P. Anderson, Andreas Kaldun, more

2012 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2012 Conference on Lasers and Electro-Optics (CLEO)

Combs of fractional high-order harmonics are generated by split-spectrum field control and explained by interference of two attosecond pulse trains. A change of the instantaneous laser frequency at the intensity maxima tunes the harmonics energies.

chapter

Plasmon-assisted photoemission from gold nanopillars in few-cycle laser fields

Joseph S. Robinson, Phillip M. Nagel, Bruce D. Harteneck, Mark J. Abel, more

2012 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2012 Conference on Lasers and Electro-Optics (CLEO)

We report plasmon-assisted photoemission from gold nanopillars using few cycle near-IR laser pulses, along with simulations, showing strong acceleration and a scaling of the electron yield that indicates the transition into the strong-field regime.

chapter

Partial-coherence colored-noise approach to model FEL pulse statistics

Thomas Pfeifer, Yuhai Jiang, Stefan Dusterer, Robert Moshammer, more

CLEO: 2011 - Laser Science to Photonic Applications > 1 - 2

2011 Conference on Lasers and Electro-Optics (CLEO)

An efficient numerical method allows to generate statistically representative sets of pulse shapes of free-electron lasers (FELs) operating in the self-amplified spontaneous emission mode (SASE) without detailed knowledge of the technical machine parameters.

article

Isolated attosecond pulses from ionization gating of high-harmonic emission

Mark J. Abel, Thomas Pfeifer, Phillip M. Nagel, Willem Boutu, more

Chemical Physics > 2009 > 366 > 1-3 > 9-14

Combining results from several techniques of attosecond spectroscopy, we show that ionization gating of high-harmonic emission on the leading edge of the driving pulse produces isolated attosecond pulses with a contrast ratio (the energy in the main pulse normalized to the energy in adjacent satellite pulses) c=3.3±0.2. Half-cycle cutoff analysis confirms that harmonic generation proceeds in the ionization-gated...

article

Time-resolved spectroscopy of attosecond quantum dynamics

Thomas Pfeifer, Mark J. Abel, Phillip M. Nagel, Aurélie Jullien, more

Chemical Physics Letters > 2008 > 463 > 1-3 > 11-24

The advent of attosecond pulsed radiation leads to a large unexplored scientific area in chemical physics: the direct time-resolved measurement of electronic quantum dynamics. Major scientific goals include spectroscopy of single- and multi-electron motion and dynamical electron correlations, relating to orbital interactions in valence and core electronic levels of atoms and molecules. The results...

chapter

Ionization gating for tunable isolated attosecond pulse generation

Aurelie Jullien, Thomas Pfeifer, Mark J. Abel, Phillip M. Nagel, more

2008 Quantum Electronics and Laser Science Conference > 1 - 2

2008 Quantum Electronics and Laser Science Conference (QELS)

Ionization gating confines high-harmonic generation to the leading edge of the driver pulse. Experimentally produced soft-x-ray continuous radiation is spectrally broad and tunable. The method suggests isolated attosecond-pulse production with long driver pulses.

chapter

Coherent control using the carrier-envelope phase

Mark J. Abel, Thomas Pfeifer, Aurelie Jullien, Phillip M. Nagel, more

2008 Conference on Lasers and Electro-Optics > 1 - 2

2008 Conference on Lasers and Electro-Optics (CLEO)

Octave-spanning laser pulses enable a new coherent control scheme based on the carrier-envelope phase (CEP). Multiphoton ionization of Xe atoms demonstrates CEP control over the phases of photoelectron quantum states and therefore the photoelectron direction.

chapter

Ionization gating for tunable isolated attosecond pulse generation

Aurelie Jullien, Thomas Pfeifer, Mark J. Abel, Phillip M. Nagel, more

2008 Conference on Lasers and Electro-Optics > 1 - 2

2008 Conference on Lasers and Electro-Optics (CLEO)

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INFONA - science communication portal

Search results for: Thomas Pfeifer

Laserlicht steuert Elektronen‐Wechselwirkung

Reaction microscope endstation at FLASH2

Discovery and evaluation of Cav3.2-selective T-type calcium channel blockers

Discovery and evaluation of Cav3.1-selective T-type calcium channel blockers

Towards precision measurements on highly charged ions using a high harmonic generation frequency comb

Ultrafast molecular structure determination of fragmentation pathways of acetylene

Optimal Control of Atomic, Molecular and Electron Dynamics with Tailored Femtosecond Laser Pulses

Fano resonances in the time domain

Surface plasmon assisted electron acceleration in photoemission from gold nanopillars

System design and process layout for a SOFC micro-CHP unit with reduced operating temperatures

Cholesteryl ester accumulation and accelerated cholesterol absorption in intestine-specific hormone sensitive lipase-null mice

Two-dimensional CEP interferometry

Fractional high-order harmonic combs and energy tuning by split-spectrum field synthesis

Plasmon-assisted photoemission from gold nanopillars in few-cycle laser fields

Partial-coherence colored-noise approach to model FEL pulse statistics

Isolated attosecond pulses from ionization gating of high-harmonic emission

Time-resolved spectroscopy of attosecond quantum dynamics

Ionization gating for tunable isolated attosecond pulse generation

Coherent control using the carrier-envelope phase

Ionization gating for tunable isolated attosecond pulse generation

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