Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory

Weathersby, Stephen; Brown, Garth; Centurion, Martin; Chase, T.; Coffee, Ryan; Corbett, Jeff; Eichner, J.; Frisch, J.; Fry, Alan; Gühr, Markus; Hartmann, Nick; Hast, C.; Hettel, R.; Jobe, R.K.; Jongewaard, E.; Lewandowski, James; Li, R. K.; Lindenberg, Aaron M.; Makasyuk, Igor; May, J.; McCormick, D.; Nguyen, Minh Ngoc; Reid, Alexander H.; Shen, Xiaozhe; Sokolowski‐Tinten, K.; Vecchione, T.; Vetter, Sharon; Wu, Juhao; Yang, Jie; Dürr, H. A.; Wang, X. J.

doi:10.1063/1.4926994

Cited by 382 publications

(269 citation statements)

References 54 publications

Supporting

Mentioning

251

Contrasting

Order By: Relevance

“…The data in diffraction from partially aligned molecules could potentially be incorporated with the standard procedures for structure refinement of GED, as it can provide additional constraints. One current limitation is the small s range captured in timeresolved diffraction experiments, but that is expected to improve significantly with improved technologies in electron pulse generation and compression [28,29]. …”

Section: Discussionmentioning

confidence: 99%

Gas-phase electron diffraction from laser-aligned molecules

Yang

Centurion

2015

Struct Chem

View full text Add to dashboard Cite

Electron diffraction is a valuable tool to capture structural information from molecules in the gas phase. However, the information contained in the diffraction patterns is limited due to the random orientation of the molecules. Additional structural information can be retrieved if the molecules are aligned. Molecules can be impulsively aligned with femtosecond laser pulses, producing a transient alignment. The alignment persists only for a time on the order of a picosecond, so a pulsed electron gun is needed to record the diffraction patterns. In this manuscript, we describe the alignment process and show the changes in the diffraction pattern as a result of alignment. Carbon disulfide, a linear molecule, was chosen as a model molecule for these experiments. We have also experimentally investigated the temporal evolution of the alignment and the dependence on the laser pulse intensity.

show abstract

Section: Discussionmentioning

confidence: 99%

Gas-phase electron diffraction from laser-aligned molecules

Yang

Centurion

2015

Struct Chem

View full text Add to dashboard Cite

show abstract

“…While currently such pulses can be generated with micron size beam dimensions [9] future sources are expected to reach focus sizes down to the few nm range [6]. In principle the possibility of beam damage occurring in the beams focus as in the case of the experiment in ref.…”

Section: Imprinting Of Topological Magnetic Structuresmentioning

confidence: 99%

“…[13] is present. However, ongoing experiments with relativistic electron beams [9] indicate that the use of ultrathin freestanding films may alleviate damage concerns. of flipping at least one single magnetic moment by 180…”

Section: Imprinting Of Topological Magnetic Structuresmentioning

confidence: 99%

“…Electrons with MeV energy travel close to the speed of light. This reduces dramatically the velocity mismatch between the electromagnetic pump and electron probe pulses in time-resolved diffraction experiments [9]. This has proven indispensable in probing ultrafast processes in fields ranging from gasphase photochemistry [10] over lattice transformation in low-dimensional systems [11] to the excitation of transient phonons [12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrafast nanoscale magnetic switching via intense picosecond electron bunches

Schäffer

Dürr²,

Berakdar³

2017

Ultrafast Nonlinear Imaging and Spectroscopy V

View full text Add to dashboard Cite

The magnetic field associated with a picosecond intense electron pulse is shown to switch locally the magnetization of extended films and nanostructures and to ignite locally spin waves excitations.Also topologically protected magnetic textures such as skyrmions can be imprinted swiftly in a sample with a residual Dzyaloshinskii-Moriya spin-orbital coupling. Characteristics of the created excitations such as the topological charge or the width of the magnon spectrum can be steered via the duration and the strength of the electron pulses. The study points to a possible way for a spatiotemporally controlled generation of magnetic and skyrmionic excitations.

show abstract

“…And its advantage over ultrafast electron diffraction is that much higher temporal resolution can be obtained using light pulses than using electron pulses [1,10]. Femtosecond time-resolved photoelectron imaging has already been successfully applied to probe structural dynamics in molecules [11][12][13], but its application to electron dynamics, which is much faster, is limited by temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

Imaging electron dynamics with time- and angle-resolved photoelectron spectroscopy

2016

View full text Add to dashboard Cite

We theoretically study how time-and angle-resolved photoemission spectroscopy can be applied for imaging coherent electron dynamics in molecules. We consider a process in which a pump pulse triggers coherent electronic dynamics in a molecule by creating a valence electron hole. An ultrashort extreme ultraviolet probe pulse creates a second electron hole in the molecule. Information about the electron dynamics is accessed by analyzing angular distributions of photoemission probabilities at a fixed photoelectron energy. We demonstrate that a rigorous theoretical analysis, which takes into account the indistinguishability of transitions induced by the ultrashort, broadband probe pulse and electron hole correlation effects, is necessary for the interpretation of time-and angle-resolved photoelectron spectra. We show how a Fourier analysis of time-and angle-resolved photoelectron spectra from a molecule can be applied to follow its electron dynamics by considering photoelectron distributions from an indole molecular cation with coherent electron dynamics.

show abstract

Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory

Cited by 382 publications

References 54 publications

Gas-phase electron diffraction from laser-aligned molecules

Gas-phase electron diffraction from laser-aligned molecules

Ultrafast nanoscale magnetic switching via intense picosecond electron bunches

Imaging electron dynamics with time- and angle-resolved photoelectron spectroscopy

Contact Info

Product

Resources

About