LEED 450 | © Scienta Omicron
LEED 450 optics with shutter.
LEED 450 | © Scienta Omicron
LEED 450 optics with shutter.
Display of Model LPS075-D power supply for LEED operation | © Scienta Omicron
Model LPS075-D power supply for LEED operation.
Display of the Model LPS300-D and LOA10-AES power supply for LEED and AES operation | © Scienta Omicron
Model LPS300-D and LOA10-AES power supply for LEED and AES operation.
Screenshot example of LIM12 Software | © Scienta Omicron
LIM12 Software.
Example of AES Software  | © Scienta Omicron
AES Software Images.
AES Element Composition Graph | © Scienta Omicron
AES Software Images.

LEED 450

Compact LEED to fit any UHV System

LEED

  • Large Angle (90°) Fluorescent LEED Display and superior magnetic shielding
  • Miniature electron gun with large coherence width double focusing
  • 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

The LEED 450 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 wide viewing angle (90° at 32 mm sample distance) and minimal shadowing of the screen by the miniature electron gun give a maximum visible LEED pattern.

More Information

Applications

LEED pattern of a CuAl (111) sample with 125 eV beam energy. | © Scienta Omicron
LEED pattern of a CuAl (111) sample with 125 eV beam energy.

The LEED 450 is capable of providing LEED and AES data for a wide range of samples.  The miniature size allows for integration into any UHV system.

LEED pattern of CuAl (111) with 108 eV beam energy. | © Scienta Omicron
LEED pattern of CuAl (111) with 108 eV beam energy.
LEED pattern of CuAl (111) with 22-108 eV beam energy | © Scienta Omicron
LEED pattern of CuAl (111) with 22-108 eV beam energy.
LEED pattern of Graphene on Iridium (111) with 74 eV beam energy | © Scienta Omicron
LEED pattern of Graphene on Iridium (111) with 74 eV beam energy.
Auger spectrum of TiO2 | © Scienta Omicron
Auger spectrum of TiO2.
Auger spectrum of SrTiO3. | © Scienta Omicron
Auger spectrum of SrTiO3.

Drawings

LEED 450 (Model BDL450) Optic | © Scienta Omicron
LEED 450 (Model BDL450) Optic

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

Technical drawing of the front view of the LEED 450 (Model BDL450) Optic | © Scienta Omicron
Front view of the LEED 450 (Model BDL450) Optic.

External LMX length calculation for LEED 450 (model BDL450):

FS = OL + WD; where FS is the flange to sample distance, OL is the fixed optic length and WD is the working distance.

FS = PL + B + OV where PL is the port length, B is the minimum bellow length and OV is the overlapping value. 

Technical drawing of the front view of the LEED 450 (Model BDL450) Optic | © Scienta Omicron
Rear view of the LEED 450 (Model BDL450) Optic
Technical drawing of the side view of the LEED 450 (Model BDL450) Optic | © Scienta Omicron
Side view of the LEED 450 (Model BDL450) Optic.

Configuration Guide and Specifications

The LEED 450 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-45) and LaB6 filament (model LaB6) are further options.

Specifications

Glass-display

Fused silica coated with indium-tin oxide conductive layer and P31 phosphor (ZnS:Ag:Cu-green, 525 nm wavelength)

Acceptance angle

90° angle of acceptance from sample at a distance of 32 mm

Retarding Field Analyser

Concentric assembly of hemispherical grids

Working distance

10 mm from sample

Grid material

Gold coated tungsten wire mesh (100 mesh, 81 % transparency)

Energy Resolution

0.8 % at low modulation voltages

Monitoring

4.5" standard viewport

Linear motion

External nipple with bellow up to 150 mm retraction from sample

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

4.5"(CF63) 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, AES - up to 100 µA at 3 keV

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

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