Resonance photoelectron spectroscopy using a tunable laser plasma light source

Joyce, John J.; Arko, A. J.; Cox, L.E.; Czuchlewski, S. J.

doi:10.1002/(sici)1096-9918(199802)26:2<121::aid-sia352>3.0.co;2-t

Cited by 19 publications

(10 citation statements)

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“…This model for δ-Pu electronic structure is supported by resonance photoemission, photon dependent PES data and mixed-level model calculations, all previously published [4,6] and now, additionally, by the temperature dependent PES data which gives compelling evidence that the narrow peak near the Fermi energy in δ-Pu shows a temperature dependence consistent with Fermi-Dirac statistics and thus, represents states within range of thermal populations of the Fermi energy and part of the Fermi surface. In δ-Pu, the electronic structure may consist of the 5f electrons being split between a localized 5 configuration and a hybridized 5f configuration.…”

Section: Discussionsupporting

confidence: 71%

“…As previously mentioned, some groups focus on a multiplet interpretation of the δ-Pu data similar to the approach used for lanthanide materials [7,8,10] while the interpretation of the PES data from Los Alamos emphasizes a dual nature to the δ-Pu 5f electronic structure with 5f electrons in localized as well as hybridized configurations [4,6]. As previously mentioned, some groups focus on a multiplet interpretation of the δ-Pu data similar to the approach used for lanthanide materials [7,8,10] while the interpretation of the PES data from Los Alamos emphasizes a dual nature to the δ-Pu 5f electronic structure with 5f electrons in localized as well as hybridized configurations [4,6].…”

Section: Figurementioning

confidence: 99%

“…In addition to the aforementioned physical properties (metallic volume, allotropes, melting point, crystal structure), there is spectroscopic evidence from photoelectron spectroscopy (PES) indicating the 5f electrons in Pu are on the boundary between localized and hybridized [4][5][6][7]. This interpretation of electronic structure is often associated with a mixed-level model and is generally (although incorrectly) considered a density of states (DOS) framework for the PES data.…”

Section: Introductionmentioning

confidence: 99%

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Localized and Itinerant States in Actinide Materials

et al. 2006

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The electronic structure of single crystal UO 2 and polycrystalline δ-Pu is examined using photoelectron spectroscopy. These two actinide materials exhibit properties consistent with the 5f electrons at the threshold between localized and itinerant character. The results for δ-Pu may be viewed as the 5f electrons exhibiting a dual nature with some fraction of the 5f levels localized and not participating in the bonding while the other fraction of 5f character is involved in bonding and hybridization with the conduction electrons. For UO 2 where angle-resolved photoemission is available, one observes dispersion in the 5f features indicative of the 5f electrons being influenced by the periodic potential of the lattice rather than purely influenced by the site to which the 5f electrons are generally localized.

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Section: Discussionsupporting

confidence: 71%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Localized and Itinerant States in Actinide Materials

et al. 2006

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“…Instrumentation for basic angle-integrated measurement in a limited range of photon energies was constructed 16 and expanded towards a tunable light source. 17,18 The first results of polycrystalline bulk samples cleaned by laser ablation 19 or sputtering 3, 4 were obtained for Pu, and later the first results for single-crystals of Pu compounds became available. 20,21 The early results evolved into a LANL program of angle-integrated transuranic photoemission.…”

Section: Methodsmentioning

confidence: 99%

“…Ports are available for future possible extensions, e.g., towards harmonic generator source or low energy laser source. The custom LPLS 17 (Fig. 4) provides energies between 27 and 140 eV with a resolving power up to 1000.…”

Section: B Light Sourcesmentioning

confidence: 99%

Integrated experimental setup for angle resolved photoemission spectroscopy of transuranic materials

Graham

Joyce

Durakiewicz

2013

Review of Scientific Instruments

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We have developed the Angle Resolved Photoemission Spectroscopy (ARPES) system for transuranic materials. The ARPES transuranic system is an endstation upgrade to the Laser Plasma Light Source (LPLS) at Los Alamos National Laboratory. The LPLS is a tunable light source for photoemission with a photon energy range covering the vacuum ultraviolet (VUV) and soft x-ray regions (27-140 eV). The LPLS was designed and developed for transuranic materials. Transuranic photoemission is currently not permitted at the public synchrotrons worldwide in the VUV energy range due to sample encapsulation requirements. With the addition of the ARPES capability to the LPLS system there is an excellent opportunity to explore new details centered on the electronic structure of actinide and transuranic materials.

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Time‐Resolved Photoelectron Spectroscopy at Surfaces Using Femtosecond XUV Pulses

Mathias¹,

Bauer²,

Aeschlimann³

et al. 2010

Dynamics at Solid State Surfaces and Interfaces

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Laser-based femtosecond light sources in the infrared, visible, and the nearultraviolet spectral regime have been successfully employed for a large number of experimental studies of real-time dynamics of ultrafast surface processes, as is discussed at length in the preceding chapters. Visible and near-ultraviolet wavelengths, however, are capable of probing only a relatively restricted range of energies in the surface electronic structure -specifically electronic states within a few electron volts around the Fermi energy. Most of the surface-related time-resolved photoemission studies to date are, for instance, based on a two-photon photoemission process (the first (static) two-photon photoemission work was performed by Teich et al. [1]) and focus on the ultrafast dephasing and decay of electronic excitations in this optical energy range [2]. The use of femtosecond pulsed light sources in the extreme ultraviolet (XUV) 1) spectral region, in contrast, allows direct access to much more deeply bound electronic levels. Furthermore, the range of electron momentum that can be studied can be substantially expanded by the use of these light sources. Both aspects are highly attractive in the study of ultrafast processes since they provide new and relevant system information, for instance, on the chemical or magnetic state, or the structure, of a surface -information that is often not accessible in time-resolved experiments employing sources at lower photon energy.The first experimental work showing that ultrafast light sources in the XUV and soft X-ray region of the spectrum were possible were conducted in the late 1980s. Studies by McPherson et al. [3] and Ferray et al. [4] were the first to clearly show the 1) The extreme ultraviolet regime covers the wavelength between 50 and 1 nm (20-1200 eV).

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Resonance photoelectron spectroscopy using a tunable laser plasma light source

Cited by 19 publications

References 0 publications

Localized and Itinerant States in Actinide Materials

Localized and Itinerant States in Actinide Materials

Integrated experimental setup for angle resolved photoemission spectroscopy of transuranic materials

Time‐Resolved Photoelectron Spectroscopy at Surfaces Using Femtosecond XUV Pulses

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