Zobrazeno 1 - 10
of 10
pro vyhledávání: '"G. H. Kassier"'
Autor:
Heinrich Schwoerer, R. Siegmund, N. Erasmus, Ilana Boshoff, G. H. Kassier, Sergio M.M. Coelho, K. Haupt
Publikováno v:
Applied Physics B. 109:249-257
Temporally resolved observation of microscopic structural dynamics of solids with ultrafast electron diffraction (UED) requires extremely short pulsed, highly charged, monoenergetic electron beams with sufficient transverse coherence length of severa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::59dd50455e44238d0229551b7f5cb527
https://doi.org/10.1007/s00340-012-5207-2
https://doi.org/10.1007/s00340-012-5207-2
Publikováno v:
physica status solidi c. 5:569-572
Samples of as-manufactured and annealed zinc oxide (ZnO) grown by melt-growth, seeded chemical vapour transport (SCVT) growth and hydrogen-implanted hydrothermal ZnO were investigated via the temperature dependent Hall technique. The conduction in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d813d87e1b8130a39c61b6f43bcaf359
https://doi.org/10.1002/pssc.200776826
https://doi.org/10.1002/pssc.200776826
Autor:
Lai Chung Liu, Yifeng Jiang, G. H. Kassier, R.J.D. Miller, Germán Sciaini, Gustavo Moriena, Ryan R. Cooney, Meng Gao, Cheng Lu, Hubert Jean-Ruel, Alexander Marx
Publikováno v:
Proceedings of SPIE
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 mate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::300cd6391806faa5b4748d12d88ea8fa
https://doi.org/10.1117/12.2062888
https://doi.org/10.1117/12.2062888
Autor:
N. Erasmus, Ilana Boshoff, Heinrich Schwoerer, Maximilian Eichberger, Helmuth Berger, K. Haupt, Jure Demsar, G. H. Kassier, Reinhard Bimurske
Publikováno v:
EPJ Web of Conferences, Vol 41, p 03024 (2013)
We report on ultrafast photoindued charge density wave (CDW) dynamics in the transition-metal dichalcogenide 4Hb-TaSe2, studied with ultrafast electron diffraction. Fluence dependence of the lattice superstructure suppression show a phase transition
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95d796e4ec2ae243eb75cdcb461f7cfd
Autor:
Reinhard Birmurske, Heinrich Schwoerer, Jure Demsar, Maximilian Eichberger, Helmuth Berger, G. H. Kassier, N. Erasmus, Ilana Boshoff, K. Haupt
Publikováno v:
Physical Review Letters. 109
The dynamics of the photoinduced commensurate-to-incommensurate charge density wave (CDW) phase transition in 4H(b)-TaSe2 are investigated by femtosecond electron diffraction. In the perturbative regime, the CDW re-forms on a 150-ps time scale, which
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82fed0a4d3c681507348aff251383425
https://doi.org/10.1103/physrevlett.109.167402
https://doi.org/10.1103/physrevlett.109.167402
Autor:
N. Erasmus, K. Haupt, Erich G. Rohwer, Heinrich Schwoerer, Sergio M.M. Coelho, H. M. von Bergmann, F.D. Auret, G. H. Kassier
Publikováno v:
The Review of scientific instruments. 81(10)
We have developed a compact streak camera suitable for measuring the duration of highly charged subrelativistic femtosecond electron bunches with an energy bandwidth in the order of 0.1%, as frequently used in ultrafast electron diffraction (UED) exp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66f8e42c33757a4900685635b09ce40b
https://pubmed.ncbi.nlm.nih.gov/21034115
https://pubmed.ncbi.nlm.nih.gov/21034115
Autor:
Heinrich Schwoerer, G. H. Kassier, N. Erasmus, K. Haupt, Maximilian Eichberger, Jure Demsar, A. von Flotow
Publikováno v:
Applied Physics Letters, 102(12):121106
A table-top femtosecond, non-relativistic, electron diffraction setup is combined with a low-jitter, photo-triggered streak camera to follow the optically induced structural dynamics in complex solids. A temporal resolution of 550 fs is experimentall
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40c0254a888c7cd19a8a241edc2d9b12
https://doi.org/10.1063/1.4798518
https://doi.org/10.1063/1.4798518
Publikováno v:
Journal of Applied Physics. 105:113111
We have designed a femtosecond electron gun suitable for ultrafast electron diffraction experiments, operating in the 30–100 kV regime. The concept is based on recompression of chirped expanding electron pulses emitted from a direct current photogu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ad27c03db88f3d69b93bbfbd06a94f6
https://doi.org/10.1063/1.3132834
https://doi.org/10.1063/1.3132834
Autor:
J.E. Westraadt, Johannes R. Botha, Julien K. Dangbegnon, A.W.R. Leitch, Kittessa T Roro, J.H. Neethling, S. Sivaraya, G H Kassier
Publikováno v:
Semiconductor Science and Technology. 23:055021
The electrical properties of zinc oxide (ZnO) thin films of various thicknesses (0.3–4.4 µm) grown by metalorganic chemical vapour deposition on glass substrates have been studied by using temperature-dependent Hall-effect (TDH) measurements in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::482d90caccf68ab15495d290da26e2cd
https://doi.org/10.1088/0268-1242/23/5/055021
https://doi.org/10.1088/0268-1242/23/5/055021
Publikováno v:
Journal of Applied Physics. 102:014903
Hall effect measurements in the range 20–370 K on as-grown and annealed hydrothermal bulk ZnO have been performed. The bulk conductivity in the highly resistive as-grown sample was found to decrease and then increase after annealing at 550 °C and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5fce135b7c1e5f7141610aa9ece4906a
https://doi.org/10.1063/1.2751413
https://doi.org/10.1063/1.2751413