Robert Stefanuik
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View article: Accessing metal-specific orbital interactions in C–H activation with resonant inelastic X-ray scattering
Accessing metal-specific orbital interactions in C–H activation with resonant inelastic X-ray scattering Open
We propose, using simulated RIXS signatures, a way of spectroscopically accessing the “two-way” charge transfer interactions between the C–H bond and the metal during C–H activation, thereby verifying and motivating orbital correlation dia…
View article: Accessing Metal-Specific Orbital Interactions in C-H Activation using Resonant Inelastic X-ray Scattering
Accessing Metal-Specific Orbital Interactions in C-H Activation using Resonant Inelastic X-ray Scattering Open
Photochemically prepared transition-metal complexes are known to be effective at cleaving the strong C-H bonds of organic molecules in room temperature solutions. There is also ample theoretical evidence that the bidirectional charge-trans…
View article: Tracking C–H activation with orbital resolution
Tracking C–H activation with orbital resolution Open
Transition metal reactivity toward carbon–hydrogen (C–H) bonds hinges on the interplay of electron donation and withdrawal at the metal center. Manipulating this reactivity in a controlled way is difficult because the hypothesized metal-al…
View article: Data for "Tracking C-H activation with orbital resolution"
Data for "Tracking C-H activation with orbital resolution" Open
These are the data displayed in the figures in the main text and in the Supplementary Materials of the manuscript entitled "Tracking C-H activation with orbital resolution".
View article: Data for "Tracking C-H activation with orbital resolution"
Data for "Tracking C-H activation with orbital resolution" Open
These are the data displayed in the figures in the main text and in the Supplementary Materials of the manuscript entitled "Tracking C-H activation with orbital resolution".
View article: Tracking C-H activation with orbital resolution
Tracking C-H activation with orbital resolution Open
The reactivity towards C-H bond activation of alkanes with transition metals is determined by the ability of the metal to donate and withdraw electron density in due proportion. Manipulating this reactivity in a controlled way is difficult…
View article: Quantum watch and its intrinsic proof of accuracy
Quantum watch and its intrinsic proof of accuracy Open
We have investigated the rich dynamics of complex wave packets composed of multiple high-lying Rydbergstates in He. A quantitative agreement is found between theory and time-resolved photoelectron spectroscopyexperiments. We show that the …
View article: From Femtosecond Excited-State and Dissociation Dynamics to Nanosecond Reaction Kinetics: Following C-H Bond Activation with X-rays
From Femtosecond Excited-State and Dissociation Dynamics to Nanosecond Reaction Kinetics: Following C-H Bond Activation with X-rays Open
Using ultrafast X-ray absorption spectroscopy, we observe how a rhodium carbonyl catalyst is formed on femtosecond timescales and reveal the decisive orbital interactions which facilitate the efficient cleavage of an alkane C-H bond from s…
View article: Optical and extreme UV studies of spin dynamics in metallic and insulating ferrimagnets
Optical and extreme UV studies of spin dynamics in metallic and insulating ferrimagnets Open
We present all-optical studies of spin dynamics in two classes of ferrimagnets. Both sets of experiments use table-top laser-based pump–probe techniques to examine the ultrafast and longer timescale spin excitations. We use the visible/nea…
View article: Element-Specific Magnetization Dynamics in Co–Pt Alloys Induced by Strong Optical Excitation
Element-Specific Magnetization Dynamics in Co–Pt Alloys Induced by Strong Optical Excitation Open
Ever since its first observation, the microscopic origin of ultrafast magnetization dynamics has been actively debated. Even more questions arise when considering composite materials featuring a combination of intrinsic and proximity-induc…
View article: Ultrafast magnetization dynamics in half-metallic Co$_2$FeAl Heusler alloy
Ultrafast magnetization dynamics in half-metallic Co$_2$FeAl Heusler alloy Open
We report on optically induced, ultrafast magnetization dynamics in the Heusler alloy $\mathrm{Co_{2}FeAl}$, probed by time-resolved magneto-optical Kerr effect. Experimental results are compared to results from electronic structure theory…
View article: Ultrafast dynamics in Fe65Co35 alloys: Effect of Re doping
Ultrafast dynamics in Fe65Co35 alloys: Effect of Re doping Open
Soft magnetic FeCo alloys are of great interest due to their potential spintronics applications. The magnetic damping parameter plays a vital role in the performance of these spintronics devices. The Gilbert damping parameter increase in t…
View article: Investigation of the surface species during temperature dependent dehydrogenation of naphthalene on Ni(111)
Investigation of the surface species during temperature dependent dehydrogenation of naphthalene on Ni(111) Open
The temperature dependent dehydrogenation of naphthalene on Ni(111) has been investigated using vibrational sum-frequency generation spectroscopy, X-ray photoelectron spectroscopy, scanning tunneling microscopy, and density functional theo…
View article: Exchange dependent ultrafast magnetization dynamics in Fe$_{1-x}$Ni$_{x}$ alloys
Exchange dependent ultrafast magnetization dynamics in Fe$_{1-x}$Ni$_{x}$ alloys Open
Element specific ultrafast demagnetization was studied in Fe$_{1-x}$Ni$_{x}$ alloys, covering the concentration range between $0.1
View article: Exchange dependent ultrafast magnetization dynamics in\n Fe$_{1-x}$Ni$_{x}$ alloys
Exchange dependent ultrafast magnetization dynamics in\n Fe$_{1-x}$Ni$_{x}$ alloys Open
Element specific ultrafast demagnetization was studied in Fe$_{1-x}$Ni$_{x}$\nalloys, covering the concentration range between $0.1<x<0.9$. For all\ncompositions, we observe a delay in the onset of Ni demagnetization relative to\nthe Fe de…
View article: Picosecond metrology of laser-driven proton bursts
Picosecond metrology of laser-driven proton bursts Open
Tracking primary radiation-induced processes in matter requires ultrafast sources and high precision timing. While compact laser-driven ion accelerators are seeding the development of novel high instantaneous flux applications, combining t…