Anusheela Das
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View article: Energy dependence of x‐ray beam size produced by polycapillary x‐ray optics
Energy dependence of x‐ray beam size produced by polycapillary x‐ray optics Open
In this work, we studied the x‐ray energy dependence of x‐ray beam diameter focused by polycapillary optics. A quantitative beam diameter–energy relation enables more accurate estimation of the element‐specific interrogation area of a samp…
View article: Atomic-Scale Interface for Pt Nanoparticles on SrTiO<sub>3</sub> (001)
Atomic-Scale Interface for Pt Nanoparticles on SrTiO<sub>3</sub> (001) Open
The interfacial structure formed by Pt nanoparticles grown epitaxially on a SrTiO3 (001) surface by pulsed laser deposition was studied by X-ray standing-wave (XSW) excited core-level photoelectron emission. The XSW-generated 3D atomic map…
View article: Pre-Flight Calibration of PIXL for X-ray Fluorescence Elemental Quantification
Pre-Flight Calibration of PIXL for X-ray Fluorescence Elemental Quantification Open
The Planetary Instrument for X-ray Lithochemistry (PIXL) is a rasterable focused-beam X-ray fluorescence (XRF) spectrometer mounted on the arm of National Aeronautics and Space Administration's (NASA) Mars 2020 Perseverance rover. To ensur…
View article: CCDC 2125175: Experimental Crystal Structure Determination
CCDC 2125175: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Atomic-Scale View of Redox Induced Changes for Monolayer MoO<sub><i>x</i></sub> on α-TiO<sub>2</sub>(110) with Chemical-State Sensitivity
Atomic-Scale View of Redox Induced Changes for Monolayer MoO<sub><i>x</i></sub> on α-TiO<sub>2</sub>(110) with Chemical-State Sensitivity Open
Supported molybdenum oxide (MoOx) plays an important role in catalytic transformations from alcohol dehydrogenation to transesterification. During these reactions, molybdenum and oxygen surface species undergo structural and chemical chang…
View article: Atomic-Site-Specific Surface Valence-Band Structure from X-Ray Standing-Wave Excited Photoemission
Atomic-Site-Specific Surface Valence-Band Structure from X-Ray Standing-Wave Excited Photoemission Open
X-ray standing-wave (XSW) excited photoelectron emission was used to measure the site-specific valence band (VB) for ½ monolayer (ML) Pt grown on a SrTiO_{3} (001) surface. The XSW induced modulations in the core level (CL), and VB photoem…
View article: Site-specific surface atom valence band structure via X-ray standing wave excited photoemission
Site-specific surface atom valence band structure via X-ray standing wave excited photoemission Open
X-ray standing wave (XSW) excited photoelectron emission was used to measure the site-specific valence band (VB) for 1/2 monolayer (ML) Pt grown on a SrTiO3 (001) surface. The XSW induced modulations in the core level (CL) and VB photoemis…
View article: Diverse Mechanistic Pathways in Single-Site Heterogeneous Catalysis: Alcohol Conversions Mediated by a High-Valent Carbon-Supported Molybdenum-Dioxo Catalyst
Diverse Mechanistic Pathways in Single-Site Heterogeneous Catalysis: Alcohol Conversions Mediated by a High-Valent Carbon-Supported Molybdenum-Dioxo Catalyst Open
With the increase in the importance of renewable resources, chemical research is shifting focus toward substituting petrochemicals with biomass-derived analogues and platform-molecule transformations such as alcohol processing. To these en…
View article: Synthesis and Structure–Activity Characterization of a Single-Site MoO<sub>2</sub> Catalytic Center Anchored on Reduced Graphene Oxide
Synthesis and Structure–Activity Characterization of a Single-Site MoO<sub>2</sub> Catalytic Center Anchored on Reduced Graphene Oxide Open
Molecularly derived single-site heterogeneous catalysts can bridge the understanding and performance gaps between conventional homogeneous and heterogeneous catalysis, guiding the rational design of next-generation catalysts. While impress…
View article: Facile Polyolefin Plastics Hydrogenolysis Catalyzed by a Surface Electrophilic d0 Hydride
Facile Polyolefin Plastics Hydrogenolysis Catalyzed by a Surface Electrophilic d0 Hydride Open
Polyolefins comprise a major fraction of single-use plastics and yet their catalytic deconstruction/recycling has proven challenging due to their inert hydrocarbon connectivities. Here an electrophilic earth-abundant single-site organozirc…
View article: Atomic-Scale Structure of Chemically Distinct Surface Oxygens in Redox Reactions
Atomic-Scale Structure of Chemically Distinct Surface Oxygens in Redox Reactions Open
During redox reactions, oxide-supported catalytic systems undergo structural and chemical changes. Improving subsequent catalytic properties requires an understanding of the atomic-scale structure with chemical state specificity under reac…
View article: Thermal Atomic Layer Deposition of Gold: Mechanistic Insights, Nucleation, and Epitaxy
Thermal Atomic Layer Deposition of Gold: Mechanistic Insights, Nucleation, and Epitaxy Open
An in situ microbalance and infrared spectroscopic study of alternating exposures to Me2Au(S2CNEt2) and ozone illuminates the organometallic chemistry that allows for the thermal atomic layer deposition (ALD) of gold. In situ quartz crysta…