FemtoLEED DLD L1000 | © Scienta Omicron
LEED DLD L1000 with integral shutter.
The FemtoLEED DLD L1000 product with specific components labelled  | © Scienta Omicron
LEED DLD L1000 with integral shutter.
Digital LEED AES Controller Display Model LPS075-D | © Scienta Omicron
Model LPS075-D power supply for LEED operation.
Microchannel plates power supply controller | © Scienta Omicron
Microchannel plates power supply controller.

FemtoLEED DLD L1000

Ultra-Sensitive and Insulating Film Crystallography

LEED

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

The LEED 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 minimised blind area due to the redundant detection opportunities of the added third delay line layer.

More Information

Applications

The LEED 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

Configuration and Specification Guide

The LEED 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.

Please contact us for the detailed Configuration and Specification Guide.

Specifications

Detector

Delay Line Detector with dynamic range 32 bit per channel, 75 microns spatial resolution and active area diameter 75 mm

Acceptance angle

77° angle of acceptance from sample

Retarding Field Analyser

Concentric assembly of hemispherical grids

Working distance

15 mm 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 150 mm 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 145 mm – 580 mm

Bakeability

Under vacuum, 250 °C maximum

Integral Miniature Electron Gun
Beam energy system

LEED – 2 µA at 100 eV and 0.5 mm beam size

Beam size

From 1 mm to 250 µm - adjusted by Wehnelt potential, limited by exchangeable aperture down to 50 µm

Electron source

Tungsten-2 % thoriated filament standard, 
single crystal LaB6 filament optional

Energy spread

0.45 eV (thoriated - tungsten filament)

Overall size

10 mm lens diameter and 80 mm length

Microchannel Plates
Working area

75 mm

L/D ratio

80:1

Channel diameter

13 microns

Centre to centre spacing

32 microns

Plate thickness

1.0 mm

Bias angle

20°

Electron gain

107, operating in pulsed mode

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