S.-W. Yu

Lawrence Livermore National Laboratory

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James Tobin

University of Wisconsin–Oshkosh

B W Chung

Lawrence Livermore National Laboratory

G. D. Waddill

Missouri University of Science and Technology

Dimosthenis Sokaras

Stanford Synchrotron Radiation Lightsource

R. Guillemin

Sorbonne Université

W. C. Stolte

Lawrence Berkeley National Laboratory

Dennis Nordlund

SLAC National Accelerator Laboratory

Simon A. Morton

Glasgow Royal Infirmary

S. Nowak

SLAC National Accelerator Laboratory

Roberto Alonso‐Mori

SLAC National Accelerator Laboratory

Cooperative Institutions

Lawrence Berkeley National Laboratory

Lawrence Livermore National Laboratory

Fritz Haber Institute of the Max Planck Society

SLAC National Accelerator Laboratory

University of Nevada, Las Vegas

University of California, Berkeley

Argonne National Laboratory

Uppsala University

Bielefeld University

Los Alamos National Laboratory

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Fragmentation dynamics of H2S following S 2p photoexcitation

The Journal of Chemical Physics (2005)

R. Guillemin W. C. Stolte Lan Thi Ngoc Dang S.-W. Yu D. W. Lindle

The fragmentation dynamics of core-excited H2S has been studied by means of partial anion and cation yield measurements around the S L2,3-subshell ionization thresholds. All detectable ionic fragments are reported, and significant differences between partial ion yields are observed. Possible dissociation pathways are discussed by comparison to previous studies of electron spectra.

Fragmentation

Photoexcitation

10.1063/1.1860012

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Citations (17)

Photofragmentation of cyanogen upon carbon and nitrogen K-shell excitation by partial ion yield experiments

Journal of Physics B Atomic Molecular and Optical Physics (2010)

G. Öhrwall W. C. Stolte R. Guillemin S.-W. Yu M. N. Piancaśtelli

Partial ion yield spectroscopy was used to study fragmentation processes in cyanogen after C 1s and N 1s photoexcitation.The interpretation of the core excitation spectrum mostly follows literature, but the high resolution has in some cases allowed a more detailed assignment.Using the fact that in Rydberg states there is an intensity increase as the fragmentation process becomes more extensive compared to valence orbitals, we have been able to distinguish resonances with valence and Rydberg character.Furthermore, we have been able to assign features in the ionization continuum as arising from double excitations or shape resonances, by observation of the suppression of anion yield at shape resonances.

Photoexcitation

Cyanogen

Fragmentation

10.1088/0953-4075/43/9/095201

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Citations (3)

Pre-eminence of the Indirect Channel in the Resonant Inverse Photoelectron Spectroscopy of Cerium Oxide

MRS Proceedings (2012)

James Tobin S.-W. Yu B W Chung G. D. Waddill

Photon energy

Dominance (genetics)

10.1557/opl.2012.785

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Citations (1)

Probing U 5f Covalency in Uranium Compounds through Oxidant 2p Bonding

Journal of the Physical Society of Japan (2020)

James Tobin S.-W. Yu David K. Shuh Dimosthenis Sokaras

Oxidant K (1s) X-ray Emission Spectroscopy (XES) was used to investigate covalency in the Oxidant 2p — Uranium 5f bonds of Uranium Dioxide (UO2) and Uranium Tetrafluoride (UF4). It will be shown that the width of the 2p Occupied Density of States (ODOS), determined from the XES measurements, correlates with the increased 5f covalency of UO2 and the increased ionicity of UF4. Analysis of the XES results includes comparison to spectral simulations, cluster calculations and peak fitting, demonstrating the potential of the oxidant K XES measurements as a probe of 5f covalency.

Uranium dioxide

10.7566/jpsj.89.024711

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Citations (9)

Covalency in oxidized uranium

Physical Review B (2015)

James Tobin S.-W. Yu R. Qiao Wanli Yang Corwin H. Booth

Using x-ray emission spectroscopy and absorption spectroscopy, it has been possible to directly access the states in the unoccupied conduction bands that are involved with $5f$ and $6d$ covalency in oxidized uranium. By varying the oxidizing agent, the degree of $5f$ covalency can be manipulated and monitored, clearly and irrevocably establishing the importance of $5f$ covalency in the electronic structure of the key nuclear fuel, uranium dioxide.

Oxidizing agent

Uranium dioxide

Uranium oxide

10.1103/physrevb.92.045130

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Citations (25)

Dramatic nondipole effects in low-energy photoionization: experimental and theoretical study of Xe 5s

APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts (2003)

O. Hemmers R. Guillemin D. W. Lindle Joseph L. Baker Andrew Hudson

Source

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Citations (2)

Soft X-ray Studies of Pu Electronic Structure: Past Lessons and Future Directions

MRS Proceedings (2008)

James Tobin S.-W. Yu

X-ray absorption spectroscopy

10.1557/proc-1104-nn07-01

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Citations (0)

Highly polarized emission in spin resolved photoelectron spectroscopy of α-Fe(001)/GaAs(001)

Surface Science (2010)

James Tobin S.-W. Yu Simon A. Morton G. D. Waddill Jamie Thompson

10.1016/j.susc.2010.04.024

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Citations (4)

Investigations of magnetic overlayers at the Advanced Photon Source

Journal of Vacuum Science & Technology A Vacuum Surfaces and Films (2010)

James Tobin S.-W. Yu M. T. Butterfield Takashi Komesu G. D. Waddill

Magnetic overlayers of Fe and Co have been investigated with x-ray magnetic circular dichroism in x-ray absorption spectroscopy and photoelectron spectroscopy, including spin-resolved photoelectron spectroscopy, at Beamline 4 at the Advanced Photon Source. Particular emphasis was placed upon the interrogation of the 2p levels of the Fe.

10.1116/1.3271153

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Citations (2)

Confirmation of sample quality: X-ray and ultraviolet photoelectron spectroscopies of uranium dioxide

Journal of Vacuum Science & Technology A Vacuum Surfaces and Films (2011)

S.-W. Yu James Tobin

X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy have been utilized to demonstrate the sample quality of a UO2 specimen. This specimen is to be used in further studies with bremsstrahlung isochromat spectroscopy and Fano spectroscopy.

Ultraviolet photoelectron spectroscopy

Ultraviolet

Sample (material)

10.1116/1.3549118

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Citations (17)