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.

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