0386076 - FZÚ 2013 RIV US eng J - Journal Article
Cho, B.I. - Engelhorn, K. - Vinko, S.M. - Chung, H.-K. - Ciricosta, O. - Rackstraw, D.S. - Falcone, R.W. - Brown, C.R.D. - Burian, Tomáš - Chalupský, Jaromír - Graves, C. - Hájková, Věra - Higginbotham, A. - Juha, Libor - Krzywinski, J. - Lee, H.J. - Messersmidt, M. - Murphy, C. - Ping, Y. - Rohringer, N. - Scherz, A. - Schlotter, W. - Toleikis, S. - Turner, J.J. - Vyšín, Luděk - Wang, T. - Wu, B. - Zastrau, U. - Zhu, D. - Lee, R. W. - Nagler, B. - Wark, J. S. - Heimann, P.A.
Resonant Kα spectroscopy of solid-density aluminum plasmas.
Physical Review Letters. Roč. 109, č. 24 (2012), "245003-1"-"245003-6". ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT ED1.1.00/02.0061; GA ČR(CZ) GAP108/11/1312; GA ČR GAP205/11/0571; GA ČR GAP208/10/2302; GA MŠMT LA08024; GA MŠMT(CZ) ME10046; GA MŠMT EE.2.3.20.0087; GA MŠMT EE2.3.30.0057
Grant - others:ELI Beamlines(XE) CZ.1.05/1.1.00/02.0061; OP VK 2 LaserGen(XE) CZ.1.07/2.3.00/20.0087; OP VK 4 POSTDOK(XE) CZ.1.07/2.3.00/30.0057; AVČR(CZ) M100101221
Institutional research plan: CEZ:AV0Z10100523
Keywords : Kα spectroscopy * free-electron lasers * solid-density aluminum plasmas
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 7.943, year: 2012

We report here on the resonant generation of K α emission, that is to say the production of copious K α radiation by tuning the x-ray FEL pulse to photon energies below that of the K edge of a solid aluminum sample. The sequential absorption of multiple photons in the same atom during the 80 fs pulse, with photons creating L-shell holes and then one resonantly exciting a K-shell electron into one of these holes, opens up a channel for the Kα production, as well as the absorption of further photons.We demonstrate rich spectra of such channels, and investigate the emission produced by tuning the FEL energy to the K-L transitions of those highly charged ions that have transition energies below the K edge of the cold material. The spectra are sensitive to x-ray intensity dependent opacity effects, with ions containing L-shell holes readily reabsorbing the K α radiation.
Permanent Link: http://hdl.handle.net/11104/0215584