Time of Flight ARPES Analyser for Maximum Transmission
- Lens design for outstanding detection efficiency
- Parallel full acceptance cone detection
- Angular resolution achieved by electron optical elements
- Larger energy windows with improved resolution
- Fast band mapping
- Improved pumping possibilities
The Scienta ARTOF 10k analyser marked a revolution in the field of angle-resolved photoelectron spectroscopy (ARPES) for pulsed photon sources with its parallel full cone detection and unchallenged transmission. The Scienta ARTOF-2 is a further development of the concept especially for sources generating harmonics and kinetic energies above 10 eV.
In contrast to traditional electron spectrometers the ARTOF analysers do not include entrance slits. Therefore, electrons are gathered in a complete cone, with energy and angular resolution. The maximum acceptance angle, with full detection, is ±15°. In this way two-dimensional band mapping experiments can be performed without sample rotation. Furthermore, the transmission is increased up to 250 times compared to traditional hemispherical electron analysers. Typical applications for the ARTOF-2 include time resolved and coincidence measurements, ARPES on radiation sensitive samples, and laser-ARPES with lower laser repetition rates (low MHz rep rate).
ARTOF Photon Source Requirements
The ARTOF-2 can handle all repetition rates up to approximately 3 MHz. Even higher repetition rates can be used with special software treatment. The pulse length will influence the energy resolution. Long pulses decrease the accuracy in determining the time of flight. On the other hand, very short pulses are less well defined in energy, due to the transform limitation. The optimum pulse length, depending on resolution requirements, ranges from tens of femtoseconds to hundreds of picoseconds. Smaller spot size increases energy as well as angular resolution.
The ARTOF-2 is built to be triggered by the laser or beamline bunches that define time zero for the time of flight measurements. Any trigger source can be used as long as the ARTOF-2 and the excitation source are synchronised and that the trigger signals involved are well defined and have constant timing.
< 0.36 meV FWHM at 2 eV kinetic energy*
< 1.6 meV FWHM at 10 eV kinetic energy*
< 265 meV FWHM at 300 eV kinetic energy*
0.2 - 1000 eV
*Calculated for 2 % energy window, ±15° angular mode, and 50 μm sample radius.
**Available in a limited kinetic energy range.
For full specifications and more information about product options, please do not hesitate to contact your local sales representative.
CRR: 2 %, 5 %, 10 %, 15 %, 20 %, 50 %, 100 %**
Approximately 3 MHz
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The Scienta Omicron ARTOF 10k analyser marked a revolution in the field of angle-resolved photoelectron spectroscopy (ARPES). Using time of flight (TOF) for energy dispersion and a precisely controlled electron lens system eliminates the need for an entrance slit as used in hemispherical analysers. This results in unrivalled high transmission, parallel full cone detection, and excellent energy resolution for typical ARPES energy ranges. The Scienta Omicron ARTOF-2 further improves the ARTOF concept on energy window width, resolution, and especially for kinetic energies above 10 eV. The high transmission of ARTOF-2 make it ideal for time resolved and coincidence experiments as well as radiation sensitive samples.
“Not since the isolation of graphene has a new material generated as much excitement among physicists as the discovery of topological insulators.” Highlights in Nature vol 6 2010. A topological insulator is as an insulator that has a metallic boundary when placed next to a vacuum or an ordinary insulator (See for example J. E. Moore, Nature 464(2010)08916.) These exotic materials can possibly be used in technological applications such as spintronics and quantum computing.