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Optistat CFV

A liquid helium (LHe) cooled continuous flow (CF) cryostat enabling optical spectroscopy experiments that require:

Base temperature down to 2.3 K
Large 30 mm diameter sample space, with sample in vacuum
Minimum number of windows in the optical path, reducing reflective losses
Generous f0.9 radial optical access with 4 radial windows and 1 axial window, with a wide range of window materials available
Upper temperature of 500 K; having no cold windows enables the use of any window material above 300 K
Operation in any orientation 

The core "cold unit" of the OptistatCF-V,  MicrostatHe and MicrostatHe Rectangular Tail is inter-changeable, enabling a modular set of optical cryostats for different experimental set-ups by swapping only the outer body.  The OptistatCF-V works on a continuous flow principle using an oil-free pump to draw liquid helium from a storage dewar, along a transfer tube, to the heat exchanger ("pull" mode). If the noise and vibration from the pump are undesirable then helium liquid can be pushed through the heat exchanger by pressurising the storage vessel ("push" mode). The sample is positioned on the sample holder in good thermal contact with the heat exchanger and surrounded by a vacuum.  Temperature control is achieved by a combination of manual helium flow control and power dissipated in an electrical heater, regulated using an ITC temperature controller.

Applications:

UV / Visible spectroscopy: Experiments at low temperatures reveal the interaction between the electronic energy levels and vibrational modes in solids. 

Infrared spectroscopy : Low temperature IR spectroscopy is used to measure changes in interatomic vibrational modes as well as other phenomena such as the energy gap in a superconductor below its transition temperature.

Raman spectroscopy : Lower temperatures result in narrower lines associated with the observed Raman excitations.

Photoluminescence : At low temperatures, spectral features are sharper and more intense, thereby increasing the amount of information available.

SPM, STM, AFM : Low temperatures decrease the thermal noise from the probes and reduce atomic vibrations.

Download PDF datasheet – Optistat CFV

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