ESR900 and ESR910 cryostats for X-band ESR spectroscopy

ESR900 and ESR910 cryostats for X-band electron spin resonance (ESR) spectroscopy

Oxford Instruments offers a range of continuous flow cryostats designed for X- and Q-band electron spin resonance/electron paramagnetic resonance (ESR/EPR) spectroscopy. The range has been designed for compatibility with commercial spectrometers.

The ESR900 and ESR910 are liquid helium (LHe) or liquid nitrogen (LN2) cooled top-loading continuous flow cryostats for ESR/EPR measurements providing:

compatibility with X-band cavities
sample temperatures down to 1.9 K
sample change times of only a few minutes

The benefits of low temperature ESR spectroscopy include:

An increase in signal levels from samples where relaxation times are very short at room temperature
The ability to study phase transitions

See also the CF935 cryostat for Q-band cavities

Specification
System components/options
Operation
Applications
Images

	ESR900	ESR910
Temperature range	2.6-300 K using EPS40 pump	1.9-300 K using EPS40 + GF4
Temperature range	3.4-300 K using GF4 pump	3.0-300 K using two GF4 pumps
Temperature stability	± 0.1 K
Cooldown time	30 minutes
Cooldown consumption	2 litres
Helium consumption at 4.2 K	1.1 l/h	1.6 l/h
Sample change time	~5 minutes
Temperature range with LN2	80-300 K	n/a

Cavity options

A range of cavity adaptors is available for different resonators

Pump options

A simple oil-free vane pump GF4 is supplied for operation to ~3 K
Lower temperatures require an EPS40 single stage rotary pump

Temperature control

Flexible single- or 3-channel ITC503

LHe transfer

An automated transfer tube is available which allows an ITC503 to optimise the liquid helium flow rate

Software control

Oxford Instruments electronics products are controllable through the OxSoft software using RS232, ISOBUS or GPIB interfaces
LabVIEW virtual instruments are provided for Oxford Instruments electronics products to allow full PC-based control and monitoring. These can be integrated into a complete LabVIEW data acquisition system

The ESR900 and ESR910 work 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. Temperature control is achieved using manual flow control and an ITC503 temperature controller.

The ESR900 will also operate with liquid nitrogen as the coolant for measurements to 80 K (not possible for the ESR910).

The ESR910 contains a small reservoir of liquid helium, maintained by a GF4 vane pump. A second vane pump or rotary pump is used to pump on the sample space to achieve base temperature.

Electron Spin Resonance

Electron Paramagnetic Resonance

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