JEOL USA JES-FA100 Electron Spin Resonance Spectrometer

Tuesday, June 18, 2013
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JES-FA100 Electron Spin Resonance Spectrometer

The JES-FA100 provides high sensitivity with an easy operation environment.

Features

Spectrometer designed to be user friendly

Powerful self-diagnosis function
Built-in frequency counter
Registration of measurement conditions in parameter file
Auto tuned microwave circuit
Spectrum display and parameter setting on touch screen

Low noise high stability microwave unit

The JEOL solid-state Gunn diode element provides long life (20,000 hours or more), stable operation, and high reproducibility

High sensitivity cavity

Cylindrical type resonator TE011 can accommodate larger samples and provides for better modulation uniformity

High-homogeneity, high resolution, high stability Electromagnets

The JES-FA100 employs a magnetic field linear sweep circuit based on the magnetic field detection system using a Hall element

Readily adaptable to the popular PC based EPR software packages

High Sensitivity

Higher sensitivity measurement is feasible by using a Gunn oscillator which supplies a noiseless stable microwave, a TE011 cylindrical cavity with a high Q-value, a large sample volume, and a modulation coil capable of obtaining a homogeneous magnetic field. The ESR spectrum at left, obtained by using a 100 kHz modulation frequency, clearly shows a guaranteed sensitivity of 7.0x10⁹ spins/0.1 mT.

Shown is an ESR spectrum of weak pitch, which has so far been used for sensitivity evaluation. The sensitivity obtained is S/N >900, literally the world's highest level.

High Resolution

The magnet polepiece is made of a high-purity material which is precision machined and provides for a homogeneous magnetic field. Ring shims are attached to polepiece surfaces to allow use of a wide high-homogeneity range. In order to obtain high resolution, a cavity made of materials without impurities such as ferromagnetic material, a highly stable power supply for the magnet, and stable magnetic field modulation are required, besides the magnet with a homogeneous magnetic field.

The JES-FA100 is well designed to meet these requirements. Shown above is an ESR spectrum of Coppinger radical. The smallest split coupling of t-butyl base 4.7 uT, and its split shows a 2.35 uT resolution.

High Stability

In order to obtain data with excellent reproducibility, a stable and linear magnetic field is necessary. To obtain a stabilized static magnetic field, the JES-FA100 employs a Hall element with good linearity, and the entire Hall element is thermally controlled to guarantee a magnetic field stability as high as 1 x 10^-5 / 0C . h. The high stability shown is 20 times superimposed ESR spectra of perylene cation radical with ±0.1 mT magnetic field sweep in one hour measurement.