A direct electron detector for time-resolved MeV electron microscopy

Direct Detectors for Electron Microscopy

There is interest in improving the detectors used to capture images in transmission electron microscopy. Detectors with an improved modulation transfer function at high spatial frequencies allow for higher resolution in images at lower magnification, which leads to an increased effective field of view. Detectors with improved detective quantum efficiency are important for low dose applications....

Double-shot MeV electron diffraction and microscopy

In this paper, we study by numerical simulations a time-resolved MeV electron scattering mode where two consecutive electron pulses are used to capture the evolution of a material sample on 10 ps time scales. The two electron pulses are generated by illuminating a photocathode in a radiofrequency photogun by two short laser pulses with adjustable delay. A streak camera/deflecting cavity is used...

A compact electron gun for time-resolved electron diffraction.

A novel compact time-resolved electron diffractometer has been built with the primary goal of studying the ultrafast molecular dynamics of photoexcited gas-phase molecules. Here, we discuss the design of the electron gun, which is triggered by a Ti:Sapphire laser, before detailing a series of calibration experiments relating to the electron-beam properties. As a further test of the apparatus, i...

Unlocking the time resolved nature of electron microscopy.

D uring the past few years, Zewail (1) and others (2, 3) have reported a remarkable series of advances that unlock the inherent time resolution in EM by introducing a laser-excited photocathode to produce timed pulses of electrons in the microscope in synchronism with a pump laser that interacts with the specimen. These experiments use variable pumpprobe delays to measure the temporal evolution...

Electron Microscopy of Fowl Pox Virus