ARTOF 2 Electron Analyser  | © Scienta Omicron
Scienta Omicron ARTOF 2. The Angular Resolved Time Of Flight analyser for ARPES.

ARTOF-2

Time of Flight ARPES Analyser for Maximum Transmission

PESARPES

  • 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 Omicron 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 ARTOF-2 is a further development of the concept improving lens design and lens tables for time of flight experiments by achieving high transmission for the desired energy window only. It is especially suited for sources generating higher harmonics at relatively low repetition rates.

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.

More Information

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 duration 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 limit. The optimum pulse duration, depending on resolution requirements, ranges from hundreds of femtoseconds to about hundred picoseconds. Smaller spot size increases energy as well as angular resolution.

Time zero for the time of flight measurements is defined by a trigger signal from the laser or beamline. 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.

Specifications

Maximum theoretical energy resolving power

13000

Energy resolution

< 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*

Kinetic energy range

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.

Angular modes

±7°, ±15°

Angular resolution

< 0.06°

Energy window

CRR: 2 %, 5 %, 10 %, 15 %, 20 %, 50 %, 100 %**

Detector type

Delay-line detector

Maximum source repetition rate

Approximately 3 MHz

Results

Electronic Structure Characterization of Cross-Linked Sulfur Polymers

2018

Cross‐linked polymers of elemental sulfur are of potential interest for electronic applications as they enable facile thin‐film processing of an abundant and inexpensive starting material. Here, we characterize the electronic...

Functions to Map Photoelectron Distributions in a Variety of Setups in Angle-Resolved Photoemission Spectroscopy

2018

The distribution of photoelectrons acquired in angle-resolved photoemission spectroscopy can be mapped onto the energy-momentum space of the Bloch electrons in the crystal. The explicit forms of the mapping function f depend on the...

Direct Determination of Monolayer MoS2 and WSe2 Exciton Binding Energies on Insulating and Metallic Substrates

2018

Understanding the excitonic nature of excited states in two-dimensional (2D) transition-metal dichalcogenides (TMDCs) is of key importance to make use of their optical and charge transport properties in optoelectronic applications....

Low Dose Photoelectron Spectroscopy at BESSY II

2018

The implementation of a high-transmission, angular-resolved time-of-flight electron spectrometer with a 1.25 MHz pulse selector at the PM4 soft X-ray dipole beamline of the synchrotron BESSY II creates unique capabilities to inquire...

Downloads

ARTOF-2 Electron Spectrometer: For ARPES

2.03 MB

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.