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Reverse View LEED Optics, 8" Flange, Fixed

Model RVL 8-120
Model RVL 8-120SH [integral shutter]

Show RVL8-120 Outline Drawing

Electron Gun:
Beam Diameter Less than 1 mm at sample
Beam Current Up to 1µA
Beam Voltage 0 to 3000V
Materials 304 SST and Al2O3
Filament Long life thoriated iridium hairpin, easily replaceable
Mounting Gun assembly removable as a single unit
Diameter 15.9 mm OD for minimal collector screen obstruction

Number of Grids Four
Material Hard Chrome-plated 304SST; 40 lines/cm
Transmission 83% per grid
Mesh Orientation Aligned to minimize Moiré effects
Geometry Strong and resilient; may be cleaned if necessary. Grids and collector screen are epicentric

Collector Screen:
Material Ground optical quality Pyrex glass, coated with SnO2 and phosphor
Mounting Special design avoids thermal stresses during bake out, and minimizes chance of damage from mechanical shock
Phosphor P2 is standard, others available. Durable SnO2 coating allows recoating with phosphor

Optics Assembly:
Mounting Complete unit mounted on 8" OD knife edge flange.
Insertion Length 8 inches (flange face to sample) standard, other lengths available
Sample Clearance .75 inches from forward end of shield
Viewport Integral 4" view port
Shield Mu metal shield standard, stainless steel available
Electrical Connections Bakeable MHV feedthrus on mounting flange
Viewing Aperture 96º viewed from either front or back

RVL8 with Shutter   


Compatible with Model 11-020 LEED Electronics.

Options & Modifications:

Model RVL 8-120SH (photo at left) has an integral shutter actuated by a rotary motion feedthru on the mounting flange . Call for details and an outline drawing.

We can also supply nonstandard flange configurations, insertion lengths, and other custom features. Call for details.

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