Double Core-Hole Creation by Sequential Attosecond Photoionization

Tamasaku, Kenji; Nagasono, Mitsuru; Iwayama, H.; Shigemasa, E.; Inubushi, Yuichi; Tanaka, Takashi; Tono, Kensuke; Togashi, Tadashi; Sato, Takahiro; Katayama, Tetsuo; Kameshima, Takashi; Hatsui, Takaki; Yabashi, Makina; Ishikawa, Tetsuya

doi:10.1103/physrevlett.111.043001

Cited by 59 publications

(50 citation statements)

References 31 publications

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“…The ability to access nonlinear light-matter interactions at X-ray wavelengths became possible only recently thanks to the development of X-ray Free Electron Lasers (XFELs) [5,6]. In contrast to the optical laser wavelengths, the photon-atom interaction at hard X-ray wavelengths involves bound core-electrons, and leads to the excitation of intermediate electronic states with sub-femtosecond lifetimes [7][8][9][10]. Consequently, at femtosecond-durations, the intense pulses made available by XFELs presently allow us to access a thus-far-uninvestigated area of physics, and to probe the physical mechanisms that drive the nonlinear interaction of X-rays with matter [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

State-Population Narrowing Effect in Two-Photon Absorption for Intense Hard X-ray Pulses

et al. 2017

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Abstract:We report on studies of state-populations during the two-photon absorption process using intense X-ray pulses. The calculations were performed in a time-dependent manner using a simple three-level model expressed by coupled rate equations. We show that the proposed approach describes well the measured rates of X-rays excited in the one-photon and two-photon absorption processes, and allows detailed investigation of the state population dynamics during the course of the incident X-ray pulse. Finally, we demonstrate that the nonlinear interaction of X-ray pulses with atoms leads to a time-narrowing of state populations. This narrowing-effect is attributed to a quadratic incidence X-ray intensity dependence characteristic for nonlinear interactions of photons with matter.

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Section: Introductionmentioning

confidence: 99%

State-Population Narrowing Effect in Two-Photon Absorption for Intense Hard X-ray Pulses

et al. 2017

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“…Specifically, we demonstrate the effects of high per-atom X-ray absorption on the fragmentation dynamics of C 60 molecules in the gas phase. C 60 offers a number of advantages as a benchmark molecule when compared with isolated atoms [29][30][31][32][33] , small molecules [34][35][36][37][38][39][40] or van der Waals (vdW) clusters 41,42 , from the perspective of radiation damage. C 60 consists of chemically bonded carbon atoms with representative bond lengths and damage processes.…”

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confidence: 99%

Femtosecond X-ray-induced explosion of C60 at extreme intensity

et al. 2014

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Understanding molecular femtosecond dynamics under intense X-ray exposure is critical to progress in biomolecular imaging and matter under extreme conditions. Imaging viruses and proteins at an atomic spatial scale and on the time scale of atomic motion requires rigorous, quantitative understanding of dynamical effects of intense X-ray exposure. Here we present an experimental and theoretical study of C 60 molecules interacting with intense X-ray pulses from a free-electron laser, revealing the influence of processes not previously reported. Our work illustrates the successful use of classical mechanics to describe all moving particles in C 60 , an approach that scales well to larger systems, for example, biomolecules. Comparisons of the model with experimental data on C 60 ion fragmentation show excellent agreement under a variety of laser conditions. The results indicate that this modelling is applicable for X-ray interactions with any extended system, even at higher X-ray dose rates expected with future light sources.

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“…Since sub-10-fs pulses are routinely available in SACLA 16 , the TCDP operation with a simple and lucid scheme can achieve high temporal resolution. In SACLA, 19 5-m-long undulators (ID01-19) with 18 mm period are installed in the beamline 17 .…”

Section: Resultsmentioning

confidence: 99%

Two-colour hard X-ray free-electron laser with wide tunability

et al. 2013

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Ultrabrilliant, femtosecond X-ray pulses from X-ray free-electron lasers (XFELs) have promoted the investigation of exotic interactions between intense X-rays and matters, and the observation of minute targets with high spatio-temporal resolution. Although a single X-ray beam has been utilized for these experiments, the use of multiple beams with flexible and optimum beam parameters should drastically enhance the capability and potentiality of XFELs. Here we show a new light source of a two-colour double-pulse (TCDP) XFEL in hard X-rays using variable-gap undulators, which realizes a large and flexible wavelength separation of more than 30% with an ultraprecisely controlled time interval in the attosecond regime. Together with sub-10-fs pulse duration and multi-gigawatt peak powers, the TCDP scheme enables us to elucidate X-ray-induced ultrafast transitions of electronic states and structures, which will significantly contribute to the advancement of ultrafast chemistry, plasma and astronomical physics, and quantum X-ray optics.

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Double Core-Hole Creation by Sequential Attosecond Photoionization

Cited by 59 publications

References 31 publications

State-Population Narrowing Effect in Two-Photon Absorption for Intense Hard X-ray Pulses

State-Population Narrowing Effect in Two-Photon Absorption for Intense Hard X-ray Pulses

Femtosecond X-ray-induced explosion of C60 at extreme intensity

Two-colour hard X-ray free-electron laser with wide tunability

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