A5084964125- Laser-Matter Interactions and Applications
- Mass Spectrometry Techniques and Applications
- Advanced Fiber Laser Technologies
- Advanced Chemical Physics Studies
- Laser-Plasma Interactions and Diagnostics
- Radiation Detection and Scintillator Technologies
- Ion-surface interactions and analysis
- Advanced Optical Sensing Technologies
- Spectroscopy and Quantum Chemical Studies
- Analytical Chemistry and Chromatography
- Chemical Synthesis and Characterization
- Semiconductor Quantum Structures and Devices
- Nuclear Physics and Applications
- Computer Graphics and Visualization Techniques
- Neural Networks and Reservoir Computing
- Advanced Vision and Imaging
- Advanced Electron Microscopy Techniques and Applications
- Advanced Fluorescence Microscopy Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Semiconductor materials and devices
- Photonic and Optical Devices
- Advanced X-ray Imaging Techniques
- Robotics and Sensor-Based Localization
- Radical Photochemical Reactions
- Photocathodes and Microchannel Plates
Wayne State University
2017-2022
Divalent europium is used catalytically in visible-light-promoted photoredox bond-forming reactions.
Abstract The velocity map imaging (VMI) technique was first introduced by Eppink and Parker in 1997, as an improvement to the original ion method Houston Chandler 1987. has gained huge popularity over past two decades become a standard tool for measuring high-resolution translational energy angular distributions of ions electrons. VMI evolved gradually from 2D momentum measurements 3D with various implementations configurations. most recent advancement brought unprecedented performance terms...
With a novel three-dimensional electron-electron coincidence imaging technique and two-electron angular streaking method, we show that the emission time delay between two electrons can be measured from tens of attoseconds to more than 1 fs. Surprisingly, in benzene, double ionization rate decays as first second electron increases during 500 as. This is further supported by decay Coulomb repulsion direction perpendicular laser polarization. result reveals laser-induced correlation plays major...
The study into the interaction between a strong laser field and atoms/molecules has led to significant advances in developing spectroscopic tools attosecond time-domain methods for controlling chemical reactions. There been great interest understanding complex electronic nuclear dynamics of molecules fields. However, it is still formidable challenge fully model such dynamics. Conventional experimental as photoelectron spectroscopy encounter difficulties revealing involved states because...
A camera-based three-dimensional (3D) imaging system with a superb time-of-flight (TOF) resolution and multi-hit capability was recently developed for electron/ion [Lee et al. J. Chem. Phys. 141, 221101 (2014)]. In this work, we report further improvement of the event rate by adopting an event-driven camera, Tpx3Cam, detecting 2D positions electrons, while high-speed digitizer provides highly accurate (∼30 ps) TOF information each at approaching 1 Mhits/sec.
In this theoretical work, we show that both the orbital helicity (${p}_{+}$ vs ${p}_{\ensuremath{-}}$) and adiabaticity of tunneling have a significant effect on initial conditions ionization. We developed hybrid quantum (numerical solution time-dependent Schr\"odinger equation) classical (back propagation trajectories) approach to extract orbital-specific electrons at exit. Clear physical insight connecting these with final momentum deflection angles are presented. Moreover, ionization is...
The yields of all dissociation channels ethane dications produced by strong field double ionization were measured. It was found that the branching ratios can be controlled varying ellipticity laser pulses. CH3+ formation and H+ show a clear competition, producing highest lowest at ∼0.6, respectively. With help theoretical calculations, such control attributed to dependent different sequential pathways.
Many important physical processes such as nonlinear optics and coherent control are highly sensitive to the absolute carrier-envelope phase (CEP) of driving ultrashort laser pulses. This makes measurement CEP immensely in relevant fields. Even though relative CEPs can be measured with a few existing technologies, estimate is not straightforward always requires theoretical inputs. Here, we demonstrate novel in-situ technique based on angular streaking that achieve goal without complicated...
We report a new implementation of three-dimensional (3D) momentum imaging for electrons, employing two-dimensional (2D) detector and silicon photomultiplier tube (siPMT). To achieve the necessary time resolution 3D electron imaging, poly(p-phenylene)-dye-based fast scintillator (Exalite 404) was used in instead conventional phosphors. The system demonstrated an time-of-flight comparable with that electrical MCP pick-off (tens picoseconds), while achieving unprecedented dead reduction (∼0.48...
We report the results of direct measurements electron momentum correlation in strong-field-driven molecular triple ionisation. With a camera-based imaging apparatus, measurement quadruple coincidence (electron–electron–electron–ion) from non-dissociative ionisation benzene and quintuple (electron–electron–electron–ion–ion) dissociative methyl iodide were carried out for first time. observed no evidence among three ejected electrons, which suggests that sequential process dominates under...
Matrix-assisted laser desorption ionization (MALDI) is a widely used mass spectrometric technique for the analysis of biomolecular compounds.For over three decades since its development considerable effort has been devoted to increasing resolution and efficiency MALDI.However, due lack detailed description fundamental processes, underlying initial ionization, leaves optimization method at trial-and-error endeavor.Generally, MALDI exploits pulse commence an event where ions, neutrals,...
Laser control of chemical reactions has been a hot topic in recent years.Ethane, which several dissociative double ionization channels under strong laser fields subjected to intense investigation.With the aid newly developed coincidence detection imaging system, we demonstrate that branching ratios ethane can be controlled by varying ellipticity ultrashort pulses.The Methyl ion formation channel and proton show significant yield changes, producing highest lowest at 0.6 respectively.We...