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This Week

Aug 1
Friday

Nanofabrication of Diffractive X-ray Optics for Applications at Synchrotrons and XFELs

Speaker: Christian David, Paul Scherrer Institut, Villigen, Switzerland
XSD Seminar
438/C010 @ 10:00 AM
View Description
I present recent developments in nanolithography to produce diffractive x-ray optics, and experimental results obtained with these devices. For the use at synchrotrons we at PSI have developed a new generation of Fresnel zone plates produced by a line doubling approach. Used in a scanning microscope, these lenses can resolve features down to 9 nm in the soft x-ray range and down to 15 nm in the multi keV range. To improve the efficiency for hard x-rays, a fabrication strategy was developed to produce two stacked zone plate structures on both sides of the support membrane. A diffraction of close to 10% was obtained at 9 keV photon energy for a zone plate with 30 nm zone width. A similar technique can be applied to produce blazed zone plates with diffraction efficiencies of 50% providing 100 nm spot size.

For use at x-ray free-electron laser (XFEL) sources, diffractive optics must be capable of withstanding extreme radiation loads. We show how diffractive optics made of diamond can be used for various applications including nanofocusing, beam-splitting, spectral monitoring and ultrafast time resolved studies
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Aug 1
Friday

In situ x-ray diffraction applied to the study of metal oxide and carbide catalysts

Speaker: Wenqian Xu
XSD Seminar
Advanced Photon Source, Argonne, IL
401/A1100 @ 11:00 AM
View Description
In situ x-ray diffraction (XRD) is nowadays widely applied in physical science to study material structures under desired conditions. In the field of catalysis, it is of key interest to know how a catalyst functions and how its structure related to its catalytic property. Probing the catalyst with x-ray at its working state is helpful in providing such information. In this talk, two studies are presented. In the first one, a Ni/CeO2 catalyst for ethanol steam reforming (ESR) is investigated with both in situ XRD and in situ infrared spectroscopy. Ethoxyl, acetate, carbonate and hydroxyl species are identified as surface intermediates that appear during the reaction process. The synergy between metallic Ni and the CeO2 support is revealed. The second study is on carburization of molybdenum oxide by temperature-programmed reduction in hydrocarbons. Formation of either the cubic or the hexagonal carbide phase is found to be affected by both concentration and speciation of the hydrocarbons as well as the heating procedures. Close examination of the XRD and the pair distribution function (PDF) profile of the cubic carbide phase shows the presence of stacking faults in its structure.
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Aug 1
Friday

User Science Seminar

APS Seminar
401/A1100 @ 12:00 PM

Upcoming

Aug 5
Tuesday

The Sirius Project

Speaker: Harry Westfahl, Jr., Brazilian Synchrotron Light Laboratory, Campinas, Brazil
XSD Seminar
401/A1100 @ 11:00 AM
View Description
The Brazilian Synchrotron Light Laboratory has started the construction of Sirius, a 3 GeV and 0.28 nm rad emittance storage ring. In this talk I will present some of the main aspects of this new storage ring and its first and second phase beamlines, as well as the current status of the project.
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Aug 8
Friday

User Science Seminar

APS Seminar
401/A1100 @ 12:00 PM
Aug 15
Friday

User Science Seminar

APS Seminar
401/A1100 @ 12:00 PM
Aug 22
Friday

User Science Seminar

APS Seminar
401/A1100 @ 12:00 PM
Aug 27
Wednesday

APS/Users Operations Monthly Meeting

APS Meeting
402/AUD @ 2:30 PM
Sep 24
Wednesday

APS/Users Operations Monthly Meeting

APS Meeting
402/AUD @ 2:30 PM
Oct 10
Friday

User Science Seminar

APS Seminar
401/A1100 @ 12:00 PM
Oct 17
Friday

User Science Seminar

APS Seminar
401/A1100 @ 12:00 PM
Oct 24
Friday

User Science Seminar

APS Seminar
401/A1100 @ 12:00 PM
Oct 29
Wednesday

APS/Users Operations Monthly Meeting

APS Meeting
402/AUD @ 2:30 PM
Oct 31
Friday

User Science Seminar

APS Seminar
401/A1100 @ 12:00 PM
Nov 19
Wednesday

APS/Users Operations Monthly Meeting

APS Meeting
402/AUD @ 2:30 PM
Dec 17
Wednesday

APS/Users Operations Monthly Meeting

APS Meeting
402/AUD @ 2:30 PM

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