Model LK2000
Electron Energy Loss Spectrometer
The LK2000 Spectrometer
The LK2000 has seen widespread use in industrial and academic laboratories worldwide. It has been successfully applied to a diverse range of problems, including hydrocarbon chemisorption (catalysis) on metals, analysis of silicon wafer cleaning techniques, characterization of polymer films, C60 films studies, and innumerable others.
Features
- Resolution at 3 meV (FWHM) and below
- Double-pass monochromator
- Very low spectral background free of "ghost" peaks
- Primary beam energy variable from 0-240 eV
- Ease in day-to-day operation
- Available with fixed or rotatable analyzer
- Dual magnetic shielding standard
- Low-noise, high-stability power supply
- Computer controlled electronics with auto-tuning software
- Complete UHV systems available
The LK2000 features a double-pass 127° monochromator of exceptional output current and very low spectral background, in combination with a single-pass analyzer. The guaranteed instrumental resolution of 3 meV is combined with very high signal levels. Further, the instrument is offered in three standard mounting configurations for ease in system integration.
- Energy Resolution and Currents*
FWHM Sample Current Detector Current 3meV > 100 pA > 10 pA 4meV > 180 pA > 20 pA 6meV > 350 pA > 60 pA *As measured in direct beam geometry - Signal Levels
Typical count rates in elastic channel are 10 KHz to 3 MHz for 3-6 meV system resolution. Count rate is a strong function of sample condition and primary beam energy - Background
Ratio of elastic channel intensity to background intensity greater than 105 at 25 meV energy loss and above (instrumental) - Primary Energy
Variable from 0-240 eV
Sample bias ± 15 V - Energy Scan
-5 eV (gain) to +15 eV loss energy (optional ±50 eV) - Computer Controlled Electronics
Operation to 240 eV beam energy
Low noise-ripple less than 250µV P-P
Drift less than 1 mV/week
Easy readout of all spectrometer voltages and critical currents
Total optical isolation
Software allows manual or auto-optimization of spectrometer voltages
Click on image to enlarge
(Above) Direct beam measurement of channeltron detector current showing an instrumental resolution of 3meV (FWHM) at primary energy of 4eV. The analyzer transmission is greater than 10%.
Mechanical Specifications
- Mounting on 10 in. or 14 in. O.D. CFF standard
- (custom designs on request)
- Compatible with 8 in. or 12 in. O.D. tubulations
- Flange to focus distance 12 in.
- UHV chamber sizes 12 in. and 18 in. O.D.
- Several sample access modes available
- Unit bakeable at 200° C
