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CAT NO: DIDACTICNPS0022
Electron Spin Resonance and Nuclear Magnetic Resonance.
Intrinsic angular momentum or Spin is a basic property of nuclei and of electrons.
Although Spin cannot be measured directly, magnetic dipole moment is strictly linked and it can be observed.
The magnetic dipole of an electron or proton arranged in a magnetic field will be aligned in corcordant or discordant direction with respect to the field.
Another oscillating magnetic field is exactly equal to the energy difference between these two states and at proper angles it disturbs the orienting field so that the electrons or protons absorb energy.
The electron or proton will return to its lowest energy state because of photonic emission.
This well defined frequency-field combination at which absorption occurs, will provoke a change of impedance in an oscillating circuit.
TRAINING PROGRAM
measuring the amplitude of line
determining g factor
studying the line form
accurate determination of terrestrial magnetic field
computer control
NMR/ESR samples supplied
operational / experimental handbook
ELECTRON SPIN RESONANCE
ESR can be observed on the samples supplied with the equipment, or on samples supplied by the user.
The sensor connected with the control unit is inserted inside a Helmholtz coil.
A resonance peak can be recorded at different frequencies for the two different samples supplied.
The bigger mass of proton needs a wider magnetic field than that of Helmholtz coils used with ESR samples.
The same sensor can be inserted into the bigger electromagnet arranged in Helmholtz configuration The unit can be tuned to output a resonance signal for the NMR samples of the equipment, or for the samples supplied by the user.
NMR spectra coming from the samples of the equipment show the resonance of hydrogen and fluorine.
This system does not need any additional accessory.
It also includes the software of program control.
It enables an exhaustive computer control of all the parameters, besides the display of data and the possibility of zooming the region of interest.
The experimental parameters are selected in a set-up page that can be saved for a following data acquisition.
Another page enables the user to process the data.
The first derivative can be integrated to obtain an absorption line.
Then the absorption line can be integrated within the limits set by the user.
Furthermore, the second and fourth moments can be calculated.
The amplitude of the first derivative, or absorption line, can be calculated.
Then these data can be saved, transferred or printed.
Data can be saved individually or in packages, allowing a better signal-noise ratio for weak signal.
Users can vary the magnetic field and scanning frequency, adjust the receiver gain and the phase of the detector of reference signal and select the time of each scanning.
Data can be detected in one or more scanning cycles.
Users can choose to display the last 5 scanning cycles on the screen with different colours.
An operational handbook for using the software and for tests on is included in the equipment.
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