Femtosecond Transmission Electron Diffraction on Single Crystalline Graphite

Gerbig, Christian; Morgenstern, Silvio; Sarpe-Tudoran, C.; Wollenhaupt, M.; Baumert, Thomas

doi:10.1364/icusd.2012.it3d.3

Cited by 2 publications

(2 citation statements)

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“…In contrast to early designs 24 , the electron pulse diffracts off the sample without going through a focusing element beforehand. We employ an FED layout introduced recently 25 where the diffracted electrons are focused onto the detector with a magnetic lens only placed behind the sample. This design significantly decreases the electron bunch propagation distance and avoids temporal distortions induced by the magnetic lens itself 26 .…”

Section: Femtosecond Electron Diffraction Setupmentioning

confidence: 99%

Compact femtosecond electron diffractometer with 100 keV electron bunches approaching the single-electron pulse duration limit

Waldecker

Bertoni

Ernstorfer

2015

Journal of Applied Physics

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We present the design and implementation of a highly compact femtosecond electron diffractometer working at electron energies up to 100 keV. We use a multi-body particle tracing code to simulate electron bunch propagation through the setup and to calculate pulse durations at the sample position. Our simulations show that electron bunches containing few thousands of electrons per bunch are only weakly broadened by space-charge effects and their pulse duration is thus close to the one of a single-electron wavepacket. With our compact setup we can create electron bunches containing up to 5000 electrons with a pulse duration below 100 femtoseconds on the sample. We use the diffractometer to track the energy transfer from photoexcited electrons to the lattice in a thin film of titanium. This process takes place on the timescale of few-hundred femtoseconds and a fully equilibrated state is reached within one picosecond.

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Section: Femtosecond Electron Diffraction Setupmentioning

confidence: 99%

Compact femtosecond electron diffractometer with 100 keV electron bunches approaching the single-electron pulse duration limit

Waldecker

Bertoni

Ernstorfer

2015

Journal of Applied Physics

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“…Figure 5 shows the calculated 9 electron pulse duration as a function of the number of electrons (per pulse) that reach the sample plane for two different electron gun configurations (see figure's caption for details). The shortest cathode sample distance is obtained by placing the sample hosted by a TEM mesh straight on the anode aperture 21 . As can be inferred from the calculations the extracting DC electric field strength (E) plays a major role.…”

Section: New Compact Electron Gun Designsmentioning

confidence: 99%

Ultrabright femtosecond electron sources: perspectives and challenges towards the study of structural dynamics in labile systems

Gao

Jean-Ruel

Lü

et al. 2014

Ultrafast Nonlinear Imaging and Spectroscopy II

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The advances made in femtosecond electron sources over the last thirty years have been remarkable. In particular, the development of ultrabright femtosecond electron sources has made possible the observation of molecular motion in labile organic materials and it is paving the way towards the study of complex protein systems. The principle of radio frequency (RF) rebunching cavities for the compression of ultrabright electron pulses is presented, alongside with a recent demonstration of its capabilities in capturing the relevant photoinduced dynamics in weakly scattering organic systems. Organic and biological systems can easily decompose or lose crystallinity as a consequence of cumulative heating effects or the formation of side reaction photoproducts. Hence, source brightness plays a crucial role in achieving sufficient signal-to-noise ratio before degradation effects become noticeable on the structural properties of the material. The current brightness of electron sources in addition to the high scattering cross section of keV-MeV electrons have made femtosecond electron diffraction a powerful tool for the study of materials composed by low-Z elements

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Femtosecond Transmission Electron Diffraction on Single Crystalline Graphite

Cited by 2 publications

References 0 publications

Compact femtosecond electron diffractometer with 100 keV electron bunches approaching the single-electron pulse duration limit

Compact femtosecond electron diffractometer with 100 keV electron bunches approaching the single-electron pulse duration limit

Ultrabright femtosecond electron sources: perspectives and challenges towards the study of structural dynamics in labile systems

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