|Product Description: |
The METIS spectrometer is a joint development of the Johannes-Gutenberg Universität Mainz and the MPI für Mikrostrukturphysik Halle. It is produced by Surface Concept and integrated by SPECS into complete and versatile UHV systems. It consists of a sample stage, a sophisticated lens system and an analyzer section. The sample stage is a high precision 6-axes hexapod for optimal alignment of the sample towards the lens entrance. The k-microscopy column comprises multiple lens system with a high extractor voltage to analyze the full half space of photoelectrons. The analyzer section is a drift tube with a 2D-DLD detector, which can be upgraded by a spin-imaging detector.
The kinetic energies of the electrons are detected in time-of-flight mode using a delayline detector (DLD). A DLD is a position (x, y) and time (t) sensitive microchannel plate area detector for imaging of single particles with temporal resolution in the picosecond range. The (x, y, t) histograms are gathered over a large number of excitation cycles of the particle generating process as the system is a single counting device. Particle images can be collected from continuous running processes with randomly incoming particle sequences without time correlation as well. The dead times of these single counting devices are typically between 6 - 20 ns, depending on the positions of subsequent hits. That enables live imaging with highest sensitivity, collecting high count rates of randomly incoming particles in the multimillion counts per second range, as well as imaging with a very high dynamic range of 106. Unlike other pico-second imaging devices, delayline detectors collect all incoming particle hits continuously without any gate window duty cycles, thus (besides the device dead time limits) all hits are collected even when they represent random time positions within the excitation cycle time period. Any gate window can be configured even after acquisition, thus flexible re-ordering of data is possible without repeating measurements.