Electron gun for diffraction experiments off controlled molecules

Abstract

A dc electron gun, generating picosecond pulses with up to $8\times 10^6$ electrons per pulse, was developed. Its applicability for future time-resolved-diffraction experiments on state- and conformer-selected laser-aligned or oriented gaseous samples was characterized. The focusing electrodes were arranged in a velocity-map imaging spectrometer configuration. This allowed to directly measure the spatial and velocity distributions of the electron pulses emitted from the cathode. The coherence length and pulse duration of the electron beam were characterized by these measurements combined with electron trajectory simulations. Electron diffraction data off a thin aluminum foil illustrated the coherence and resolution of the electron-gun setup.

References in corpus (9)

• Femtosecond Diffractive Imaging with a Soft-X-ray Free-Electron Laser
• Laser-induced alignment and orientation of quantum-state-selected large molecules
• Spatially-controlled complex molecules and their applications
• A selector for structural isomers of neutral molecules
• State- and conformer-selected beams of aligned and oriented molecules for ultrafast diffraction studies
• Spatial separation of state- and size-selected neutral clusters
• Two-state wave packet for strong field-free molecular orientation
• Computational studies of x-ray scattering from three-dimensionally-aligned asymmetric-top molecules
• Toward atomic resolution diffractive imaging of isolated molecules with x-ray free-electron lasers

Cited by in corpus (2)

• X-ray diffractive imaging of controlled gas-phase molecules: Toward imaging of dynamics in the molecular frame
• Velocity-map imaging for emittance characterization of multiphoton-emitted electrons from a gold surface