Introduction of AMO end-station

The AMO end-station consists of cold target recoil ion momentum spectroscopy (COLTRIMS) reaction microscope and a Composite Velocity Map Imaging System.

By integration of time-resolved coincidence measurement and velocity map imaging (VMI) techniques, the end-station will be dedicated to the investigation of processes in atoms, small molecules, and clusters occurring in highly intense beams. Scientific areas of application are atomic and molecular physics, chemical dynamics, and, in very general terms, investigations of light matter interaction.

Samples are typically prepared in gaseous form, in jets or beams.

Composite Velocity Map Imaging System

The composite velocity imaging spectrometer (CpVMI) is one of two novel instruments at the Shanghai soft x-ray free electron laser (SXFEL) for AMO science. The CpVMI consists of a supersonic molecular beam generation device, an electron velocity imaging system, a three-dimensional ion momentum imaging system and a vacuum system. Pump-probe scheme can be achieved with in-coupling of x-ray with the external optical laser. The dynamical measurement covers electronic kinetic energy ranges from 100 eV up to 1000 eV with high energy resolution, which provides a powerful observation capability for the related physical and chemical processes.