| 1. |
- Barillot, T., et al.
(author)
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Angular asymmetry and attosecond time delay from the giant plasmon resonance in C60 photoionization
- 2015
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 91
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Journal article (peer-reviewed)abstract
- This combined experimental and theoretical study demonstrates that the surface plasmon resonance in C 60 alters the valence photoemission quantum phase, resulting in strong effects in the photoelectron angular distribution and emission time delay. Electron momentum imaging spectroscopy is used to measure the photoelectron angular distribution asymmetry parameter that agrees well with our calculations from the time-dependent local density approximation (TDLDA). Significant structure in the valence photoemission time delay is simultaneously calculated by TDLDA over the plasmon active energies. Results reveal a unified spatial and temporal asymmetry pattern driven by the plasmon resonance and offer a sensitive probe of electron correlation. A semiclassical approach facilitates further insights into this link that can be generalized and applied to other molecular systems and nanometer-sized metallic materials exhibiting plasmon resonances.
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| 2. |
- Barillot, T., et al.
(author)
-
Attosecond time delays in C-60 valence photoemissions at the giant plasmon
- 2015
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In: Journal of Physics: Conference Series. - : IOP Publishing. - 1742-6596 .- 1742-6588. ; 635, s. 112074-112074
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Conference paper (peer-reviewed)abstract
- We perform time-dependent local density functional calculations of the time delay in C-60 HOMO and HOMO-1 photoionization at giant plasmon energies. A semiclassical model is used to develop further insights.
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| 3. |
- Laksman, J., et al.
(author)
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Dissociation Pathways in the Cysteine Dication after Site-Selective Core Ionization
- 2014
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In: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1520-6106 .- 1520-5207. ; 118:40, s. 11688-11695
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Journal article (peer-reviewed)abstract
- A photoelectronionion coincidence experiment has been carried out on the amino acid molecule cysteine after core-ionization of the O 1s, N 1s, C 1s, and S 2p orbitals. A number of different dissociation channels have been identified. Some of them show strong site-selective dependence that can be attributed to a combination of nuclear motion in the core-ionized state and Auger processes that populate different final electronic states in the dication.
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| 4. |
- Sankari, Anna, et al.
(author)
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Non-radiative decay and fragmentation in water molecules after 1a1-14a1 excitation and core ionization studied by electron-energy-resolved electron–ion coincidence spectroscopy
- 2020
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In: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 152:7
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Journal article (peer-reviewed)abstract
- In this paper, we examine decay and fragmentation of core-excited and core-ionized water molecules combining quantum chemical calculations and electron-energy-resolved electron–ion coincidence spectroscopy. The experimental technique allows us to connect electronic decay from core-excited states, electronic transitions between ionic states, and dissociation of the molecular ion. To this end, we calculate the minimum energy dissociation path of the core-excited molecule and the potential energy surfaces of the molecular ion. Our measurements highlight the role of ultra-fast nuclear motion in the 1a1-14a1 core-excited molecule in the production of fragment ions. OH+ fragments dominate for spectator Auger decay. Complete atomization after sequential fragmentation is also evident through detection of slow H+ fragments. Additional measurements of the non-resonant Auger decay of the core-ionized molecule (1a1-1) to the lower-energy dication states show that the formation of the OH+ + H+ ion pair dominates, whereas sequential fragmentation OH+ + H+ → O + H+ + H+ is observed for transitions to higher dication states, supporting previous theoretical investigations.
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| 5. |
- Takenaka, H., et al.
(author)
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Manufacture of High Precision, Multilayer Based Polarimeter Designed for Wide Energy Range from EUV to Soft X-Ray
- 2018
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In: X-Ray Lasers 2016 - Proceedings of the 15th International Conference on X-Ray Lasers. - Cham : Springer International Publishing. - 9783319730240 ; 202, s. 291-295
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Conference paper (peer-reviewed)abstract
- The development of a high precision five rotation axes polarimeter using transmission multilayers as polarizers and reflection multilayers as analyzers is presented. In order to cover a wide energy range from EUV to soft X-ray, a set of Mo/Si, Cr/C, Sc/Cr, and W/B4C multilayers for transmission and reflection have been designed and fabricated. A hexapod support allows to align the polarimeter easily relative to the optical axis, and the instrument is designed to be moved conveniently between different beamlines.
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