DA30-L-8000 Angular Resolved Hemispherical Electron Analyser  | © Scienta Omicron
The DA30-L-8000 angular resolved hemispherical analyser with deflector concept.

DA30-L-8000

Highest Performance at the Lowest Kinetic Energies

PESARPESHR-ARPESUPSSpin-ARPESμARPES

  • 30° full cone acceptance without sample rotation
  • Spin-resolved MDC without sample rotation
  • Matrix element effects are avoided by keeping sample fixed
  • Ensures same spot for all k//
  • Improved ky accuracy (resolution better than 0.1°)
  • Patented (WO2013/133739)
  • Fast electronic deflection

The DA30-L-8000 analyser is a progression of the DA30-L analyser optimised for ultra-high resolution at low kinetic energies. Combined with Scienta Omicron´s deflector concept electronic band structure mapping of the full surface Brillouin zone without changing measurement geometry is possible. These are the models of choice for ARPES measurements below 3 eV kinetic energy with high demands for energy resolution.

The DA30-L-8000 is not a serial production analyser but tailored to the particular experiment of each customer. To ensure best possible performance of the analyser a number of important processes have been optimised.

The high voltage electronics design has been optimised for high energy resolution using ultra stable HV-supplies. Each HV-supply is checked individually for low noise and long-term stability. Special attention is paid to common grounding of all analyser parts to the HV-electronics.

Critical dimensions of analyser parts are trimmed manually to reach the design criteria. Special care is taken to the mu-metal connections inside the analyser and the analyser is demagnetised at customer site.

The analyser is supplied with a customised slit set and lens table for 0.5 eV pass energy enabling ultra-high resolution measurements.

More Information

Deflection Advantage

Graph showing the sequential deflection along θy  | © Scienta Omicron
Sequential deflection along θy enables measurements of the whole acceptance cone of the analyser without sample movement. A: Deflectors off. B and C: Increasing deflection along θy.

The deflection feature is a big advantage as it allows to keep the sample in a fixed position and instead uses the deflectors to change the angular range in θy projected on to the analyser slit. This ensures the same position of the sample is probed during the whole measurement. In addition, keeping the experimental geometry fixed throughout the measurement sequence avoids matrix element effects which are caused by variations in ionisation cross section for different photon to sample angles. This allows to acquire higher quality data using the faster and more precise electronic deflection compared with mechanical sample movement. Another advantage, for some samples, is that decreased rotation requirements allow manipulators with fewer degrees of freedom to be used. This ultimately allows for lower sample temperatures to be reached.

DA30-L-8000 UPS Upgrade

This item extends the kinetic energy range of the DA30-L-8000 up to 100 eV. The required additional high voltage cards will be housed in the DA30-L-8000 HV-rack. When using the UPS upgrade HV configuration the DA30-L-8000 will have DA30-L performance in terms of energy resolution.

HV-rack Addition

The HV rack unit that can be used with DA30-L-8000 for extended kinetic energy range | © Scienta Omicron
Additional HV rack for use with DA30-L-8000 for extended kinetic energy range.

An XPS energy range upgrade is possible by adding a second high voltage electronics rack. The separate HV-rack will extend the energy range up to 1500 eV kinetic energy with DA30-L performance.

Specifications

Energy resolution

< 1.0 meV FWHM

Transmission mode energy range

0.5 eV – 12 eV *

Angular modes

± 3.5°, ± 7°, ± 15°

Angular mode energy range

0.5 eV – 12 eV *

* The energy range can be extended to 100 eV with the available UPS upgrade.

For full specifications and more information about product options, please do not hesitate to contact your local sales representative.

 

Deflection mode energy range

0.5 eV – 12 eV *

Deflection mode Spin scan

Yes

Operating pressure

< 10-5 mbar

Mounting flange

NW 200 CF

Results

A Time- and Angle-Resolved Photoemission Spectroscopy with Probe Photon Energy up to 6.7 eV

2019

We present the development of a time- and angle-resolved photoemission spectroscopy based on a Yb-based femtosecond laser and a hemispherical electron analyzer. The energy of the pump photon is tunable between 1.4 and 1.9 eV, and...

High-Resolution Three-Dimensional Spin- and Angle-Resolved Photoelectron Spectrometer using Vacuum Ultraviolet Laser Light

2016

We describe a spin- and angle-resolved photoelectron spectroscopy (SARPES) apparatus with a vacuum-ultraviolet (VUV) laser (hν = 6.994 eV) developed at the Laser and Synchrotron Research Center at the Institute for Solid State Physics,...

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