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FemtoLEED Spectrometer

FemtoLEED DLD L1000

Ultra-Sensitive and Insulating Film Crystallography

Collaboration with RoentDek in Germany. Notes:

Different electronics & software: LPS075-D (electron gun & grids); DLA-TR8 (controller for delay line detector & computer interface PCI card); DLD-LIM32 (delay line detector acquisition software & LEED analysis software for Windows 7/10); Cobold (for analyzing data from anode – hit times, location calculations etc. – to produce image).

In addition to the LPS075-D & MCPS02 controllers, a DLA-TR8 controller from RoentDek is needed for operation of the hexDLD-anode.

Description

The FemtoLEED DLD L1000 with integral shutter enables measurements of ultra-sensitive and insulating films. Instead of a fluorescent screen, it uses a delay line detector which allows for fully digital operation. The hex-anode provides minimized blind area due to the redundant detection opportunities of the added third delay line layer.


Features

  • Fully digital
  • Minimized blind area
  • Electron diffraction on insulating single crystal samples
  • Large coherence width
  • Powerful operation with digital LEED controller

Applications

The FemtoLEED DLD L1000 is specifically useful for investigations on ultra-sensitive and insulating films. The fully digital system negates the need for an external CCD camera for live image capture.

Drawings

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

Side view of FemtoLEED DLD L1000.

Key Specifications

For detailed specifications, download FemtoLEED DLD L1000 Configuration and Specifications (PDF).

Optics
Detector Delay Line Detector with dynamic range 32 bit per channel, 75 microns spatial resolution and active area diameter 75mm
Acceptance angle 77° angle of acceptance from sample
Retarding Field Analyser Concentric assembly of hemispherical grids
Working distance 15mm from sample
Grid material Gold coated tungsten wire mesh (100 mesh, 81% transparency)
Energy Resolution 0.2%
Monitoring 10" standard viewport
Linear motion External nipple with bellow up to 150mm retraction
Integral Shutter Manual shutter driven by a rotary feedthrough
Magnetic shielding Mu-metal cylinder with front cover for maximum attenuation
Assembly Extreme-high-vacuum compatibility with stainless steel, high alumina and Au-plated copper alloy materials
Mounting 10"(CF200) double sided conflat flange with sample distance 145mm – 580mm
Bakeability Under vacuum, 250°C maximum
Integral Miniature Electron Gun
Beam energy system LEED – 2 µA at 100 eV and 0.5mm beam size
Beam size from 1mm to 250 µm - adjusted by Wehnelt potential, limited by exchangeable aperture down to 50 µm
Electron source Tungsten-2% thoriated filament standard,
single crystal LaB 6 filament optional
Energy spread 0.45 eV (thoriated - tungsten filament)
Overall size 10mm lens diameter and 80mm length
Microchannel Plates
Working area 75mm
L/D ratio 80:1
Channel diameter 13 microns
Center to center spacing 32 microns
Plate thickness 1.0mm
Bias angle 20°
Electron gain 10 7 , operating in pulsed mode

Configuration Guide

The FemtoLEED DLD L1000 optics is controlled using a LPS075-D power supply with a MCPS02 controller used to operate the microchannel plates. In addition to the LPS075-D and MCPS02 controllers, the DLA-TR8 controller from Roentdek is needed for operation of the hexDLD-anode. Integral shutter (model ISH) and LaB6 filament (model LaB6) are further options.

For more information, download FemtoLEED DLD L1000 Configuration and Specifications (PDF).