Compact LEED to fit any UHV System
- 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.
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.
For seamless integration, 3D step files are available for all models.
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.
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.
Fused silica coated with indium-tin oxide conductive layer and P31 phosphor (ZnS:Ag:Cu-green, 525 nm wavelength)
90° angle of acceptance from sample at a distance of 32 mm
Concentric assembly of hemispherical grids
10 mm from sample
Gold coated tungsten wire mesh (100 mesh, 81 % transparency)
0.8 % at low modulation voltages
4.5" standard viewport
External nipple with bellow up to 150 mm retraction from sample
Manual shutter driven by a rotary feedthrough
Mu-metal cylinder with front cover for maximum attenuation
Extreme-high-vacuum compatibility with stainless steel, high alumina and Au-plated copper alloy materials
4.5"(CF63) double sided conflat flange with sample distance 145 mm – 580 mm
Under vacuum, 250 °C maximum
LEED – 2 µA at 100 eV and 0.5 mm beam size, AES - up to 100 µA at 3 keV
From 1 mm to 250 µm - adjusted by Wehnelt potential, limited by exchangeable aperture down to 50 µm
Tungsten-2 % thoriated filament standard, single crystal LaB6 filament optional
0.45 eV (thoriated - tungsten filament)
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.