Adam M. Summers
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View article: Nonlinear reversal of photo-excitation on the attosecond time scale improves ultrafast x-ray diffraction images
Nonlinear reversal of photo-excitation on the attosecond time scale improves ultrafast x-ray diffraction images Open
The advent of isolated and intense sub-femtosecond X-ray pulses enables tracking of quantummechanical motion of electrons in molecules and solids. The combination of X-ray spectroscopy and diffraction imaging is a powerful approach to visu…
View article: Design and performance of a magnetic bottle electron spectrometer for high-energy photoelectron spectroscopy
Design and performance of a magnetic bottle electron spectrometer for high-energy photoelectron spectroscopy Open
We describe the design and performance of a magnetic bottle electron spectrometer (MBES) for high-energy electron spectroscopy. Our design features a 2 m long electron drift tube and electrostatic retardation lens, achieving sub-electronvo…
View article: Catalysis in Extreme Field Environments: A Case Study of Strongly Ionized SiO<sub>2</sub> Nanoparticle Surfaces
Catalysis in Extreme Field Environments: A Case Study of Strongly Ionized SiO<sub>2</sub> Nanoparticle Surfaces Open
High electric fields can significantly alter catalytic environments and the resultant chemical processes. Such fields arise naturally in biological systems but can also be artificially induced through localized nanoscale excitations. Recen…
View article: Tracking surface charge dynamics on single nanoparticles
Tracking surface charge dynamics on single nanoparticles Open
Surface charges play a fundamental role in physics and chemistry, in particular in shaping the catalytic properties of nanomaterials. However, tracking nanoscale surface charge dynamics remains challenging due to the involved length and ti…
View article: Catalysis in Extreme Field Environments: The Case of Strongly Ionized $SiO_{2}$ Nanoparticle Surfaces
Catalysis in Extreme Field Environments: The Case of Strongly Ionized $SiO_{2}$ Nanoparticle Surfaces Open
High electric fields can significantly alter catalytic environments and the resultant chemical processes. Such fields arise naturally in biological systems but can also be artificially induced through localized excitations at nanoscale. Re…
View article: Attosecond core-level absorption spectroscopy reveals the electronic and nuclear dynamics of molecular ring opening
Attosecond core-level absorption spectroscopy reveals the electronic and nuclear dynamics of molecular ring opening Open
View article: Tracking Surface Charge Dynamics on Single Nanoparticles
Tracking Surface Charge Dynamics on Single Nanoparticles Open
Tracing the dynamical behavior of light-induced surface charges on nanostructures is pivotal for elucidating the fundamental processes governing catalysis and light-nanomaterial interactions. Extension to nanoscale surface charge dynamics,…
View article: Tracking Surface Charge Dynamics on Single Nanoparticles
Tracking Surface Charge Dynamics on Single Nanoparticles Open
Surface charges play a fundamental role in physics and chemistry, particularly in shaping the catalytic properties of nanomaterials. Tracking nanoscale surface charge dynamics remains challenging due to the involved length and time scales.…
View article: Enhanced optical conductivity and many-body effects in strongly-driven photo-excited semi-metallic graphite
Enhanced optical conductivity and many-body effects in strongly-driven photo-excited semi-metallic graphite Open
View article: Attosecond Core-Level Absorption Spectroscopy Reveals the Electronic and Nuclear Dynamics of Molecular Ring-Opening
Attosecond Core-Level Absorption Spectroscopy Reveals the Electronic and Nuclear Dynamics of Molecular Ring-Opening Open
We show that attosecond core-level spectroscopy is a powerful tool for investigating molecular dynamics due to its combined attosecond temporal resolution and the broad coherent spectrum that allows deciphering the signatures of nuclear an…
View article: Enhanced optical conductivity and many-body effects in strongly-driven photo-excited semi-metallic graphite
Enhanced optical conductivity and many-body effects in strongly-driven photo-excited semi-metallic graphite Open
The excitation of quasi-particles near the extrema of the electronic band structure is a gateway to electronic phase transitions in condensed matter. In a many-body system, quasi-particle dynamics are strongly influenced by the electronic …
View article: Enhanced cutoff energies for direct and rescattered strong-field photoelectron emission of plasmonic nanoparticles
Enhanced cutoff energies for direct and rescattered strong-field photoelectron emission of plasmonic nanoparticles Open
The efficient generation, accurate detection, and detailed physical tracking of energetic electrons are of applied interest for high harmonics generation, electron-impact spectroscopy, and femtosecond time-resolved scanning tunneling micro…
View article: Non-Adiabatic Electronic and Vibrational Ring-Opening Dynamics resolved with Attosecond Core-Level Spectroscopy
Non-Adiabatic Electronic and Vibrational Ring-Opening Dynamics resolved with Attosecond Core-Level Spectroscopy Open
Non-adiabatic dynamics and conical intersections play a central role in the chemistry of most polyatomic molecules, ranging from isomerization to heterocyclic ring opening and avoided photo-damage of DNA. Studying the underpinning correlat…
View article: Realizing Attosecond Core-Level X-ray Spectroscopy for the Investigation of Condensed Matter Systems
Realizing Attosecond Core-Level X-ray Spectroscopy for the Investigation of Condensed Matter Systems Open
Unraveling the exact nature of nonequilibrium and correlated interactions is paramount for continued progress in many areas of condensed matter science. Such insight is a prerequisite to develop an engineered approach for smart materials w…
View article: Strong-Field Control of Plasmonic Properties in Core–Shell Nanoparticles
Strong-Field Control of Plasmonic Properties in Core–Shell Nanoparticles Open
The strong-field control of plasmonic nanosystems opens up new perspectives\nfor nonlinear plasmonic spectroscopy and petahertz electronics. Questions,\nhowever, remain regarding the nature of nonlinear light-matter interactions at\nsub-wa…
View article: Few-femtosecond resolved imaging of laser-driven nanoplasma expansion
Few-femtosecond resolved imaging of laser-driven nanoplasma expansion Open
The free expansion of a planar plasma surface is a fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. The significance of the associated spatiotemporal plasma motion ranges…
View article: High harmonic generation in mixed XUV and NIR fields at a free-electron laser
High harmonic generation in mixed XUV and NIR fields at a free-electron laser Open
We present the results of an experiment investigating the generation of high-order harmonics by a femtosecond near-infrared (NIR) laser pulse in the presence of an extreme ultraviolet (XUV) field provided by a free-electron laser (FEL), a …
View article: Real-time imaging of laser-driven nanoplasma expansion.
Real-time imaging of laser-driven nanoplasma expansion. Open
The free expansion of a planar plasma surface is a fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. The significance of the associated spatiotemporal plasma motion ranges…
View article: Higher-order harmonic generation and strong field ionization with Bessel–Gauss beams in a thin jet geometry
Higher-order harmonic generation and strong field ionization with Bessel–Gauss beams in a thin jet geometry Open
A promising alternative to Gaussian beams for use in strong field science is Bessel–Gauss (BG or Bessel-like) laser beams, as they are easily produced with readily available optics and provide more flexibility of the spot size and working …
View article: Unraveling Ultrafast Photoionization in Hexagonal Boron Nitride
Unraveling Ultrafast Photoionization in Hexagonal Boron Nitride Open
The non-linear response of dielectrics to intense, ultrashort electric fields has been a sustained topic of interest for decades with one of its most important applications being femtosecond laser micro/nano-machining. More recently, renew…
View article: Interplay of pulse duration, peak intensity, and particle size in laser-driven electron emission from silica nanospheres
Interplay of pulse duration, peak intensity, and particle size in laser-driven electron emission from silica nanospheres Open
We present the results of a systematic study of photoelectron emission from isolated dielectric nanoparticles (SiO2) irradiated by intense 25 fs, 780 nm linearly polarized laser pulses as a function of particle size (20 nm to 75…
View article: An intense, few-cycle source in the long-wave infrared
An intense, few-cycle source in the long-wave infrared Open
View article: Spatial characterization of Bessel-like beams for strong-field physics
Spatial characterization of Bessel-like beams for strong-field physics Open
We present a compact, simple design for the generation and tuning of both the spot size and effective focal length of Bessel-like beams. In particular, this setup provides an important tool for the use of Bessel-like beams with high-power,…
View article: Fragmentation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mtext>CD</mml:mtext><mml:mo>+</mml:mo></mml:msup></mml:math>induced by intense ultrashort laser pulses
Fragmentation ofinduced by intense ultrashort laser pulses Open
The fragmentation of CD+ in intense ultrashort laser pulses was investigated using a coincidence three-dimensional momentum imaging technique improved by employing both transverse and longitudinal electric fields. This allowed clear separa…
View article: Carrier-envelope-phase stabilized terawatt class laser at 1 kHz with a wavelength tunable option
Carrier-envelope-phase stabilized terawatt class laser at 1 kHz with a wavelength tunable option Open
We demonstrate a chirped-pulse-amplified Ti:Sapphire laser system operating at 1 kHz, with 20 mJ pulse energy, 26 femtosecond pulse duration (0.77 terawatt), and excellent long term carrier-envelope-phase (CEP) stability. A new vibrational…