Nitrogen cryostat with nitrogen reservoir with sample in vacuum, OptistatDN-V

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

Specifications
System components/options
Operation
Applications
Images

Layout and dimensions

OptistatDN-V liquid nitrogen (LN2) optical spectroscopy cryostat dimensions

Specifications

Sample holder dimensions	20 mm wide x 50 mm long
Temperature range	77-500 K
Temperature stability	± 0.1 K (measured over 10 minute period)
Cooldown time from ambient to 77 K	20 minutes
Liquid nitrogen capacity	1.2 litres
Hold time at 77 K	≥ 15 hours
Sample change time	1 hour
Cryostat weight	5 kg

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® on-line catalogue

Sample holders

A wide range of sample holder options is available

New OxSoft IDK instrument development kit software

With the new Oxsoft IDK you have new levels of control. You can design remote control and configuration programs and integrate your system into your preferred experiment control architecture.

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

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.

OptistatDN and DN-V liquid nitrogen (LN2) optical spectroscopy cryostat operating principle

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.