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Optistat DNV

The OptistatDN-V enables optical spectroscopy experiments that require:

Base temperatures down to 77 K
Sample in vacuum mounted directly on the heat exchanger; sample change still takes only 1 hour
Hold time greater than 15 hours at 77 K, allowing a full working day's experiments to be run without refilling
Generous f1 radial optical access, with 4 radial windows and 1 axial window
A minimum number of windows in the optical path to maximise transmission
Maximum window flexibility - all windows are at room temperature and easy to change
A compact and low-cost cryostat, particularly suitable for low temperature absorption, flourescence and photoluminescence spectroscopy

The OptistatDN-V is very easy to use. A liquid nitrogen reservoir surrounds the upper part of the central sample tube and supplies liquid nitrogen via a capillary tube to a heat-exchanger. During operation, the gravity fed flow of liquid is controlled by a valve in the exhaust line, on the cryostat top plate. In a vacuum system, the sample space is evacuated and the sample holder located directly on the heat exchanger. Effective sample cooling is achieved due to good thermal contact between the sample holder and the heat exchanger. To change the sample, the cryostat is warmed to room temperature, the vacuum released and the outer case removed.

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.

Gas absorption : We have developed a special cryostat in partnership with Quantachrome Instruments to fit their autosorb-iQ gas sorption analyzers.

Download PDF datasheet – Optistat DNV

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