CL8100 MK5

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Optical Microscope Cathodoluminiscence Stage, that can be mounted on most of optic microscopes.



With Cathodoluminescence you can achieve the same information as with an Electron Microscope but at a fraction of the cost and time, as no special preparation is required.

The Optical Cathodoluminescence Stage can be mounted to most optical microscopes, whether transmitted or reflected light, with a large choice of techniques.

The chamber accepts both solid accepts both solid (to 15mm thick) and thin sections. The basic cathodoluminescence system can be enhanced by the addition of Optical Spectral Analysis (OSA) or Energy Dispersive X-Ray Spectrometry (EDX). Measurements of the same specimen position can be made with these analytical attachments when used concurrently.

Features and benefits:

  • The MK5 model extends the facilities of the earlier CL8200 MK4 model, while retaining the time proven, fully automatic operation
  • Smaller footprint
  • Micro-controller together with large alphanumeric display (Provides additional information on the operation and status of the unit)
  • Automatic display brightness compensation for room illumination
  • Research considerations include removing gun voltage while continuing pumping and providing the operating conditions to an external PC
  • Software is continually being enhanced for effectiveness and usability


Stage

  • Stage movement viewing area – 70mm x 50mm
  • Sample thickness up to 15mm

Sample Chamber

  • Base window for transmitted light microscopy for standard polished geological sections.
  • Vacuum manifold with automatic precision vacuum control valve, solid-state pressure gauge, automatic vent valve.
  • KF direct connection for vacuum pump.

Chamber Top Plate (Incorporating Electron Gun)
Choice of TP5 or TP9 top plate included in standard unit.
TP5 with 5mm WD for objectives with 2.5 X and above magnification.
TP9, larger window top plate with 9 mm WD for objectives from 1 X and above.
(either Top Plate available as an additional item).

Micro-Controlled Electronics Unit

  • Gun Supply – 4kV to 30kV and 20μA to 2mA. Gun current , voltage electronic/vacuum stabilised.
  • Controls – pre-select gun voltage, gun current values.
  • Switch select- insert sample, operate mode: automatic or manual, gun voltage on/off
  • Alpha numeric display- gun voltage, gun current, vacuum, operating mode and state, diagnostics for all internal power supplies, control values.
  • PC interface- RS 232
  • Preset controls- gun power, voltage limit, current limit, display auto brightness.
  • Indicators- vacuum pump, vacuum ready, kV on, gun supply limits, vacuum control valve operation.
  • Gun safety- interlock to vacuum, external link present.
  • Options- two auxiliary power supplies.

Vacuum
Precision automatic control valve, automatic vent valve. Input port air, helium, argon or other gas.
Measurement:

– solid-state pressure gauge, indication
– alpha-numeric display.
Operation
– touch switch, automatic vacuum controlled gun high voltage & current
– vent. Interlock to high voltage.

A cathodoluminescence (CL) microscope combines methods from electron and regular (light optical) microscopes. It is designed to study the luminescence characteristics of polished thin sections of solids irradiated by an electron beam.
Using a cathodoluminescence microscope, structures within crystals or fabrics can be made visible which cannot be seen in normal light conditions. Thus, for example, valuable information on the growth of minerals can be obtained. CL-microscopy is used in geology, mineralogy and materials science (rocks, minerals, volcanic ash, glass, ceramic, concrete, fly ash, etc.).

CL color and intensity are dependent on the characteristics of the sample and on the working conditions of the electron gun. Here, acceleration voltage and beam current of the electron beam are of major importance. Today, two types of CL microscopes are in use. One is working with a “cold cathode” generating an electron beam by a corona discharge tube, the other one produces a beam using a “hot cathode”. Cold-cathode CL microscopes are the simplest and most economic type. Unlike other electron bombardment techniques like electron microscopy, cold cathodoluminecence microscopy provides positive ions along with the electrons which neutralize surface charge buildup and eliminate the need for conductive coatings to be applied to the specimens. The “hot cathode” type generates an electron beam by an electron gun with tungsten filament. The advantage of a hot cathode is the precisely controllable high beam intensity allowing to stimulate the emission of light even on weakly luminescing materials (e.g. quartz – see picture). To prevent charging of the sample, the surface must be coated with a conductive layer of gold or carbon. This is usually done by a sputter deposition device or a carbon coater.
CL systems can also be attached to a scanning electron microscope. These devices are expensive and are traditionally used for special applications like e.g. investigations in materials sciences or quality determination of ceramics. The most prominent advantage is their higher magnifications. However, CL colour information can only be obtained by a spectroscopic analysis of the Luminescence emission.

Direct viewing of emission colors is only provided by optical CL microscopes, both “cold” and “hot” cathode types.