Aufsatz
Artikel (Publikationen im Open Access gefördert durch die UB)
Spatio-temporal resolution studies on a highly compact ultrafast electron diffractometer
Zusammenfassung
Time-resolved diffraction with femtosecond electron pulses has become a promising technique to directly provide insights into photo induced primary dynamics at the atomic level in molecules and solids. Ultrashort pulse duration as well as extensive spatial coherence are desired, however, space charge effects complicate the bunching of multiple electrons in a single pulse.Weexperimentally investigate the interplay between spatial and temporal aspects of resolution limits in ultrafast electron diffraction (UED) on our highly compact transmission electron diffractometer. To that end, the initial source size and charge density of electron bunches are systematically manipulated and the resulting bunch properties at the sample position are fully characterized in terms of lateral coherence, temporal width and diffracted intensity.Weobtain a so far not reported measured overall temporal resolution of 130 fs (full width at half maximum) corresponding to 60 fs (root mean square) and transversal coherence lengths up to 20 nm. Instrumental impacts on the effective signal yield in diffraction and electron pulse brightness are discussed as well. The performance of our compactUEDsetup at selected electron pulse conditions is finally demonstrated in a time-resolved study of lattice heating in
multilayer graphene after optical excitation.
multilayer graphene after optical excitation.
Zitierform
In: New journal of physics. - London : IOP, 2015, 17, 043050, 1-23Förderhinweis
Gefördert durch den Publikationsfonds der Universität KasselSammlung(en)
Publikationen (Experimentalphysik III - Femtosekundenspektroskopie und ultraschnelle Laserkontrolle)Artikel (Publikationen im Open Access gefördert durch die UB)
Zitieren
@article{urn:nbn:de:hebis:34-2015063048618,
author={Gerbig, C. and Senftleben, Arne and Morgenstern, S. and Sarpe, C. and Baumert, Thomas},
title={Spatio-temporal resolution studies on a highly compact ultrafast electron diffractometer},
year={2015}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2015$n2015 1500 1/eng 2050 ##0##urn:nbn:de:hebis:34-2015063048618 3000 Gerbig, C. 3010 Senftleben, Arne 3010 Morgenstern, S. 3010 Sarpe, C. 3010 Baumert, Thomas 4000 Spatio-temporal resolution studies on a highly compact ultrafast electron diffractometer / Gerbig, C. 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/urn:nbn:de:hebis:34-2015063048618=x R 4204 \$dAufsatz 4170 7136 ##0##urn:nbn:de:hebis:34-2015063048618
2015-06-30T11:23:04Z 2015-06-30T11:23:04Z 2015 1367-2630 urn:nbn:de:hebis:34-2015063048618 http://hdl.handle.net/123456789/2015063048618 Gefördert durch den Publikationsfonds der Universität Kassel eng Urheberrechtlich geschützt https://rightsstatements.org/page/InC/1.0/ 530 Spatio-temporal resolution studies on a highly compact ultrafast electron diffractometer Aufsatz Time-resolved diffraction with femtosecond electron pulses has become a promising technique to directly provide insights into photo induced primary dynamics at the atomic level in molecules and solids. Ultrashort pulse duration as well as extensive spatial coherence are desired, however, space charge effects complicate the bunching of multiple electrons in a single pulse.Weexperimentally investigate the interplay between spatial and temporal aspects of resolution limits in ultrafast electron diffraction (UED) on our highly compact transmission electron diffractometer. To that end, the initial source size and charge density of electron bunches are systematically manipulated and the resulting bunch properties at the sample position are fully characterized in terms of lateral coherence, temporal width and diffracted intensity.Weobtain a so far not reported measured overall temporal resolution of 130 fs (full width at half maximum) corresponding to 60 fs (root mean square) and transversal coherence lengths up to 20 nm. Instrumental impacts on the effective signal yield in diffraction and electron pulse brightness are discussed as well. The performance of our compactUEDsetup at selected electron pulse conditions is finally demonstrated in a time-resolved study of lattice heating in multilayer graphene after optical excitation. open access In: New journal of physics. - London : IOP, 2015, 17, 043050, 1-23 Gerbig, C. Senftleben, Arne Morgenstern, S. Sarpe, C. Baumert, Thomas doi:10.1088/1367-2630/17/4/043050
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