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INTEGRALEED Spectrometer

LEED 800 (model BDL800IR)

Full Flange Size LEED for Higher Angular and Energy Resolution

Description

The LEED 800 with integral shutter has LEED and AES capabilities using a miniature electron gun, set of concentric grids and a conductive, phosphor coated screen. It is an extremely reliable high-performance LEED instrument which operates with up to date digital power supply. The retraction mechanism has outstanding mechanical properties ensuring smooth day-to-day operation as experienced by our large user base over decades. The LEED 800 delivers exceptionally sharp and bright LEED patterns with high resolution in k-space (typical transfer width of 300 Å at 100 eV). The wide viewing angle (100° at 75mm sample distance) and minimal shadowing of the screen by the miniature electron gun give a maximum visible LEED pattern.


Features

  • High energy & image resolution for LEED and AES with no Moire pattern interference
  • Large angle (100°) fluorescent LEED display and superior magnetic shielding
  • Miniature electron gun with large coherence width and dual lenses
  • Suitable for in-situ film growth monitoring
  • Low outgassing rate
  • Convenient LEED image Capture with external CCD camera
  • Simple and powerful operation with digital controller

Applications

The LEED 800 is capable of providing LEED and AES data for a wide range of samples. The larger size allows for higher angular and energy resolution.

Drawings

For seamless integration, 3D step files are available for all models.

Layout of LEED 800 (model BDL800IR) optic.

LEED 800 (model BDL800IR) calculation formula for Flange-Sample distance and Retraction length:
FS = 173mm + 2 LMX – OV; where FS is the flange to sample distance, LMX is the retraction length and OV is the overlapping length.

Front view of LEED 800 (model BDL800IR) optic.
Rear view of LEED 800 (model BDL800IR) optic.
Side view of LEED 800 (model BDL800IR) optic.

Key Specifications

For detailed specifications, download LEED 800 Configuration & Specifications (PDF).

Optics
Glass-display Fused silica coated with indium-tin oxide conductive layer and P31 phosphor (ZnS:Ag:Cu-green, 525 nm wavelength)
Acceptance angle100 °C angle of acceptance from sample at a distance of 75mm
Retarding Field AnalyserConcentric assembly of hemispherical grids
Working distance18mm from sample
Grid materialGold coated tungsten wire mesh (100 mesh, 81% transparency)
Energy Resolution0.2% - 0.5% at low modulation voltages
Monitoring8" standard viewport
Linear motionup to 150mm retraction from sample (100mm standard); linear ball bearing and acme thread with all spring electr. connections
Integral ShutterManual shutter driven by a rotary feedthrough
Magnetic shieldingMu-metal cylinder with front cover for maximum attenuation
AssemblyExtreme-high-vacuum compatibility with stainless steel, high alumina and Au-plated copper alloy materials
Mounting8"(CF150) double sided conflat flange with sample distance 145mm – 500mm
BakeabilityUnder vacuum, 250 °C maximum
Integral Miniature Electron Gun
Beam energy systemLEED – 5 eV to 750 eV, AES – 5 eV to 3000eV
Beam currentLEED – 2 µA at 100 eV and 0.5mm beam size, AES - up to 100 µA at 3 keV
Beam sizefrom 1mm to 250 µm - adjusted by Wehnelt potential, limited by exchangeable aperture down to 50 µm
Electron sourceTungsten-2% thoriated filament standard, 
single crystal LaB6 filament optional
Energy spread0.45 eV (thoriated - tungsten filament)
Overall size10mm lens diameter and 80mm length

Configuration Guide

The LEED 800 optics is controlled using either a LPS075-D or LPS300-D power supply. The LPS075-D is used to operate the optic in LEED mode only whereas the LPS300-D in conjunction with the LOA10-AES lock-in controller and AUS30 input coupler is used to operate the optics in LEED and AES modes. Integral shutter (model ISH-8) and LaB6 filament (model LaB6) are further options.

For more information, download LEED 800 Configuration & Specifications (PDF).

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