Our nitrogen cryostat, OptistatDN-V is ideal for experiments which require 77 K base temperature a large sample space and a minimum number of windows in the optical beam path thus reducing reflective losses.

  • Wide temperature range: from 77 K - 500 K
  • Large sample space enabling studies of sample with a wide range of size and geometry
  • 15 hours cryogen hold time before refills required providing the convenience of a full working day operation
  • Superb optical access (f/1) for measurements requiring light collection
  • DC electrical measurements via 10-pin electrical feedthrough connected to pins near the heat exchanger
  • Optimised clear beam throughput (35 mm diameter aperture) allows a large illumination area for measurements involving the detection of low intensity light
  • No cold windows enabling the use of any window material above 300 K
  • Compact size allowing easy integration into commercial spectrometers

 

Specifications

Temperature range 77 - 500 K
Temperature stability ± 0.1 K (measured over 10 min period)
Maximum sample space 20 mm diameter
Sample holder dimensions 20 mm wide x 50 mm long
Sample change time (mins) 60
Cool down from ambient to 77 K (mins) 20
Liquid nitrogen capacity 1.2 L
Hold time at 77 K ≥ 15 hours

 

System Components/Options

A typical system consists of:

  • OptistatDN-V nitrogen cryostat
  • Sample holder
  • Up to five sets of windows. (four radial; one axial); only one window is required by axis
  • New Mercury iTC temperature controller
  • High vacuum pumping system

Optional items:

  • Wiring and electrical connections to the sample

Windows

 A wide range of window materials can be fitted to the OptistatDN-V to meet specific spectroscopy applications

  • Special windows with non-parallel faces and anti-reflection coatings are available
  • Additional or replacement window available via the Oxford Instruments Direct - Cryospares® online catalogue

Sample holders

  • A wide range of sample holder options is available

 See also the OptistatDN for this cryostat with sample in exchange gas.

 

Operation

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.

 

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