AVS 45th International Symposium
    Surface Science Division Monday Sessions
       Session SS1+NS-MoA

Paper SS1+NS-MoA10
Super Transmission and Resolution Energy Analyzer and Mass-Analyzer System (STREAMS)

Monday, November 2, 1998, 5:00 pm, Room 308

Session: Novel Surface Probes
Presenter: N. Kholine, Russian Academy of Sciences
Authors: K. Siegbahn, ESCA LASER Lab Institute for Materials Science, Sweden
R. Maripuu, ESCA LASER Lab Institute for Materials Science, Sweden
N. Kholine, Russian Academy of Sciences
U. Golikov, State Technical University, Russia
M. Larin, Joint Stock Co. CRYOVACS, Russia
Correspondent: Click to Email
A new type of instrument for scientific and technological research is proposed. Its main peculiarity and advantage are the capability to separate charged particles in accordance with their energies and masses on high level of resolution and sensitivity. A basis of the spectrometer is electrostatic axially symmetrical field structure with matched radial and axial potential gradient. The electron optical system can function either in dispersion or time-of-flight mode of operation. The charge particles follow the same trajectories in this field independently of the mode of operation. Electron spectroscopy or mass-spectroscopy information from the same point of the analyzed sample can be received by switching over to the appropriate potentials of the power source and the detector system. So one and the same instrument can function as a high performance electron spectrometer or a mass-spectrometer. Relative energy resolution better than 0.05% in the energy range of 20-3000 eV and mass resolution more than 5000 in the mass range 1-500 a.e.m. are easily realized for acceptance solid angle of the spectrometer equals to at least 30% out of hemisphere. The diameter of the analyzer is 200 mm, its length is 600 mm. An ultra high vacuum is ensured in the spectrometer at the level 10@super-11@ mbar by oil free pumping system with highly economical cryo condensation-absorption pump cooled by liquid helium. Almost all the spectrometer is made of nonmagnetic materials and first of all from titanium. The surfaces faced into vacuum have special plating with very low absorption-desorption capacity. So ultra high vacuum is achieved without baking out the spectrometer.