Vacuum Optics Catalogue - April 2020

UHV CF RHEED Screens
CF Viewport
CF Viewport
Seal Type
Weld Ring
Specification
Induction
Kovar
Phosphor Layer
Phosphor Layer
Glass Coated With ITO
Viewport coated with ITO
Standard Phosphor
Coating
Maximum
Temperature
P22 yellow/green
Indium Tin Oxide (ITO)
conducting underlayer on
vacuum face of window
350 °C
Minimum Temperature minus 20 °C
Maximum Rate of
Temperature Change
3 °C per minute
Leak Rate
Pressure Range
<1x10 -10 atm-cc/sec (He)
1 bar to 10 -11 mbar
UHV CF RHEED
Screens
Torr Scientific produces a range of RHEED screens which are processed using kodial glass zero
length viewports with kovar weld rings and options of 304L or 316LN CF flanges. P22 yellow green
phosphor is supplied as standard and other phosphors including P11, P43 and P46 can be supplied
on request. Options with additional 6mm thick lead glass discs for X-Ray protection are also
offered. Screens can be prepared to customer design including phosphor layers directly on to lead
glass windows. RHEED, Reflection High Energy Electron Diffraction, is a typical application used as
a structural probe during material growth and deposition in Molecular Beam Epitaxy. Torr Scientific
also refurbishes LEED screens and processes custom specific phosphor screens on various substrates,
typically glass and lead glass.
CF-1
CF-2
CF-3
CF-4
110
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