Stable sub-micrometre high-flux probe for soft X-ray ARPES using a monolithic Wolter mirror

A focusing optics that can provide a sub-micrometre high-flux probe for soft X-ray micrometre-scale angle-resolved photoemission spectroscopy (ARPES) is proposed. A monolithic Wolter-type mirror with a large acceptance, achromatism and small comatic aberration was designed and evaluated. A focused beam size of 0.4 µm (vertical) × 4 µm (horizontal), a high throughput of 59% and a high tolerance of 1.6 mrad to the pitching error were realized at a photon energy of 1000 eV. A Wolter-type mirror can be practically employed as a stable sub-micrometre focusing mirror with high throughput in ARPES applications.

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Strategies for high-throughput focused-beam ptychography

Journal of Synchrotron Radiation ◽

10.1107/s1600577517009869 ◽

2017 ◽

Vol 24 (5) ◽

pp. 1078-1081 ◽

Cited By ~ 10

Author(s):

Chris Jacobsen ◽

Junjing Deng ◽

Youssef Nashed

Keyword(s):

High Throughput ◽

Reconstructed Image ◽

Data Sampling ◽

Beam Size ◽

Pixel Size ◽

Ray Optics ◽

X Ray ◽

Wide Range ◽

Focused Beam

X-ray ptychography is being utilized for a wide range of imaging experiments with a resolution beyond the limit of the X-ray optics used. Introducing a parameter for the ptychographic resolution gain G p (the ratio of the beam size over the achieved pixel size in the reconstructed image), strategies for data sampling and for increasing imaging throughput when the specimen is at the focus of an X-ray beam are considered. The tradeoffs between large and small illumination spots are examined.

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Aging of the surface of an Al-Cr-Fe approximant phase in ambient conditions: chemical composition and physical properties

MRS Proceedings ◽

10.1557/proc-805-ll8.8 ◽

2003 ◽

Vol 805 ◽

Cited By ~ 2

Author(s):

D. Veys ◽

P. Weisbecker ◽

V. Fournée ◽

B. Domenichini ◽

S. Weber ◽

...

Keyword(s):

Chemical Composition ◽

Mass Spectroscopy ◽

Electrochemical Behavior ◽

Stable State ◽

Photoemission Spectroscopy ◽

Atmospheric Conditions ◽

Electrical Model ◽

Ambient Conditions ◽

X Ray ◽

Angle Resolved Photoemission Spectroscopy

ABSTRACTWe have investigated the surface properties of quasicrystalline and approximant phases in the Al-(Cu)-Cr-Fe system upon aging in ambient conditions. We found that some of these properties (like the electrochemical behavior, wetting or friction) slowly evolves with the length of exposure to normal atmospheric conditions, reaching a stable state only after several days. This report essentially focuses on one of these alloys, an Al65Cr27Fe8 approximant phase with g-brass structure. In a first part, we describe the effect of aging on the electrochemical behavior of this alloy and we propose an interpretation based on a simple electrical model of the oxidized surface. In a second part, we present a model describing the surface as a stacking of several layers (oxides, oxy-hydroxides, contamination) whose thickness evolves with time. The model is supported by X-ray reflectivity, angle-resolved photoemission spectroscopy and secondary neutral mass spectroscopy measurements.

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Soft x-ray angle-resolved photoemission spectroscopy on Ag(001): Band mapping, photon momentum effects, and circular dichroism

Physical Review B ◽

10.1103/physrevb.77.045126 ◽

2008 ◽

Vol 77 (4) ◽

Cited By ~ 32

Author(s):

F. Venturini ◽

J. Minár ◽

J. Braun ◽

H. Ebert ◽

N. B. Brookes

Keyword(s):

Circular Dichroism ◽

Photoemission Spectroscopy ◽

Photon Momentum ◽

X Ray ◽

Angle Resolved Photoemission Spectroscopy ◽

Circular Dichroïsm ◽

Band Mapping

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Itinerant U5fband states in the layered compoundUFeGa5observed by soft x-ray angle-resolved photoemission spectroscopy

Physical Review B ◽

10.1103/physrevb.73.125109 ◽

2006 ◽

Vol 73 (12) ◽

Cited By ~ 20

Author(s):

Shin-ichi Fujimori ◽

Kota Terai ◽

Yukiharu Takeda ◽

Tetsuo Okane ◽

Yuji Saitoh ◽

...

Keyword(s):

Photoemission Spectroscopy ◽

X Ray ◽

Angle Resolved Photoemission Spectroscopy

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Electronic Structure of Trivalent Compound EuPd3 Studied by Soft X-ray Angle-resolved Photoemission Spectroscopy

Journal of the Physical Society of Japan ◽

10.7566/jpsj.89.044704 ◽

2020 ◽

Vol 89 (4) ◽

pp. 044704 ◽

Cited By ~ 1

Author(s):

Ikuto Kawasaki ◽

Masaaki Kobata ◽

Shin-ichi Fujimori ◽

Yukiharu Takeda ◽

Hiroshi Yamagami ◽

...

Keyword(s):

Electronic Structure ◽

Photoemission Spectroscopy ◽

X Ray ◽

Angle Resolved Photoemission Spectroscopy

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Development of a soft X-ray angle-resolved photoemission system applicable to 100 µm crystals

Journal of Synchrotron Radiation ◽

10.1107/s0909049511034418 ◽

2011 ◽

Vol 18 (6) ◽

pp. 879-884 ◽

Cited By ~ 7

Author(s):

Takayuki Muro ◽

Yukako Kato ◽

Tomohiro Matsushita ◽

Toyohiko Kinoshita ◽

Yoshio Watanabe ◽

...

Keyword(s):

Electronic States ◽

Spot Size ◽

Optical Microscope ◽

Photoemission Spectroscopy ◽

Beam Spot ◽

X Ray ◽

Angle Resolved Photoemission Spectroscopy ◽

Clear Band ◽

Sample Position

A system for angle-resolved photoemission spectroscopy (ARPES) of small single crystals with sizes down to 100 µm has been developed. Soft X-ray synchrotron radiation with a spot size of ∼40 µm × 65 µm at the sample position is used for the excitation. Using this system an ARPES measurement has been performed on a Si crystal of size 120 µm × 100 µm × 80 µm. The crystal was properly oriented on a sample stage by measuring the Laue spots. The crystal was cleavedin situwith a microcleaver at 100 K. The cleaved surface was adjusted to the beam spot using an optical microscope. Consequently, clear band dispersions along the Γ–Xdirection reflecting the bulk electronic states were observed with a photon energy of 879 eV.

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