Eric Montgomery
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View article: Statistically elucidated responses from low-signal contrast mechanisms in ultrafast electron microscopy
Statistically elucidated responses from low-signal contrast mechanisms in ultrafast electron microscopy Open
The emergence of ultrafast electron microscopy (UEM) has enabled the discovery of strongly correlated dynamic mechanisms, including electron–phonon coupling, structural phase transitions, thermal transport, and electromagnetic deflection. …
View article: Broad band tunable energy electron beam pulser
Broad band tunable energy electron beam pulser Open
An electromagnetic mechanical pulser implements a transverse wave metallic comb stripline TWMCS kicker having inwardly opposing teeth that retards a phase velocity of an RF traveling wave to match the kinetic velocity of a continuous elect…
View article: Demonstration of thermal limit mean transverse energy from cesium antimonide photocathodes
Demonstration of thermal limit mean transverse energy from cesium antimonide photocathodes Open
The mean transverse energy (MTE) of electrons emitted from cathodes is a critical parameter that determines the brightness of electron beams for applications, such as x-ray free electron lasers, particle colliders, and ultrafast electron s…
View article: Theory of photoemission from cathodes with disordered surfaces
Theory of photoemission from cathodes with disordered surfaces Open
Linear-accelerator-based applications like x-ray free electron lasers, ultrafast electron diffraction, electron beam cooling, and energy recovery linacs use photoemission-based cathodes in photoinjectors for electron sources. Most of these…
View article: Sintered wire cesium dispenser photocathode
Sintered wire cesium dispenser photocathode Open
A photoelectric cathode has a work function lowering material such as cesium placed into an enclosure which couples a thermal energy from a heater to the work function lowering material. The enclosure directs the work function lowering mat…
View article: EPEN-17. Recurrent infratentorial ependymomas in children: a meta-analysis on molecular-based outcomes
EPEN-17. Recurrent infratentorial ependymomas in children: a meta-analysis on molecular-based outcomes Open
The overall prognosis of infratentorial ependymoma differs based on molecular signature, however the impact of recurrence on prognosis remains poorly defined in the pediatric population. PubMed, Scopus, Embase, and Ovid were searched for p…
View article: Physically and chemically smooth cesium-antimonide photocathodes on single crystal strontium titanate substrates
Physically and chemically smooth cesium-antimonide photocathodes on single crystal strontium titanate substrates Open
The performance of x-ray free electron lasers and ultrafast electron diffraction experiments is largely dependent on the brightness of electron sources from photoinjectors. The maximum brightness from photoinjectors at a particular acceler…
View article: Diamond Mott Polarimeter (CRADA Final Report)
Diamond Mott Polarimeter (CRADA Final Report) Open
The goals of this project are to show the feasibility of a diamond Mott polarimeter to collect the data needed to improve upon the world-record 0.61% uncertainty in spin polarization measured at 5 MeV, and quantify the performance of diamo…
View article: Ultrafast Transmission Electron Microscopy: Techniques and Applications
Ultrafast Transmission Electron Microscopy: Techniques and Applications Open
With the growing applications of temporally resolved electron microscopy for probing basic phenomena and reducing beam-induced damage, a multifaceted introduction to the field of ultrafast transmission electron microscopy is provided. This…
View article: Expanding the capabilities of the RF stroboscopic TEM
Expanding the capabilities of the RF stroboscopic TEM Open
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View article: Half-Metal Spin Filter for Highly Polarized Emission from GaAs Photocathodes
Half-Metal Spin Filter for Highly Polarized Emission from GaAs Photocathodes Open
GaAs-based photocathodes are one of the major sources of spin-polarized electrons and are crucial for the upcoming Electron-Ion collider experiments which includes study of proton spin and spin parity violation in the standard model. The t…
View article: Optical and Surface Characterization of Alkali-Antimonide Photocathodes
Optical and Surface Characterization of Alkali-Antimonide Photocathodes Open
Alkali-antimonides, characterized by high quantum efficiency and low mean transverse energy in visible light, are excellent electron sources to drive x-ray free electron lasers, electron cooling and ultrafast electron diffraction applicati…
View article: Towards Ultra-Smooth Alkali Antimonide Photocathode Epitaxy
Towards Ultra-Smooth Alkali Antimonide Photocathode Epitaxy Open
Photocathodes lead in brightness among electron emitters, but transverse momenta are unavoidably nonzero. Ultra-low transverse emittance would enable brighter, higher energy x-ray free-electron lasers (FEL), improved colliders, and more co…
View article: Perpendicular magnetic anisotropy in half-metallic thin-film Co <sub>2</sub> CrAl
Perpendicular magnetic anisotropy in half-metallic thin-film Co <sub>2</sub> CrAl Open
Magnetocrystalline anisotropy (MCA) is one of the key parameters investigated in spin-based electronics (spintronics), e.g. for memory applications. Here, we employ first-principles calculations to study MCA in thin film full Heusler alloy…
View article: Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy
Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy Open
A laser-free hack for ultrafast electron microscopy reveals electromagnetic wave dynamics at picosecond time scale.
View article: Chemical substitution induced half-metallicity in CrMnSb(1−<i>x</i>)P<i>x</i>
Chemical substitution induced half-metallicity in CrMnSb(1−<i>x</i>)P<i>x</i> Open
Half-metallic Heusler alloys have been intensively studied in recent years due to their potential applications in spin-based devices, e.g., in magnetic tunnel junctions. Yet, their properties may be very sensitive to the choice of the subs…
View article: Retrofittable Laser-free kHz to GHz Tunable Pulser for Ultra-fast Electron Microscopy
Retrofittable Laser-free kHz to GHz Tunable Pulser for Ultra-fast Electron Microscopy Open
Since its inception [1], the ultrafast transmission electron microscope, (UTEM) which is capable of imaging nanoscale phenomena at ultrafast timescales [2-4], has increasingly gained attractions among researchers.As a result, major TEM ven…
View article: Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy
Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy Open
Integrating femtosecond (fs) lasers to electron microscopies has enabled direct imaging of transient structures and morphologies of materials in real time and space, namely, ultrafast electron microscopy (UEM). Here we report the developme…
View article: Laser-free GHz stroboscopic transmission electron microscope: Components, system integration, and practical considerations for pump–probe measurements
Laser-free GHz stroboscopic transmission electron microscope: Components, system integration, and practical considerations for pump–probe measurements Open
A 300 keV transmission electron microscope was modified to produce broadband pulsed beams that can be, in principle, between 40 MHz and 12 GHz, corresponding to temporal resolution in the nanosecond to picosecond range without an excitatio…
View article: Field reconstruction from proton radiography of intense laser driven magnetic reconnection
Field reconstruction from proton radiography of intense laser driven magnetic reconnection Open
Magnetic reconnection is a process that contributes significantly to plasma dynamics and energy transfer in a wide range of plasma and magnetic field regimes, including inertial confinement fusion experiments, stellar coronae, and compact,…