ELECTRON SPIN RESONANCE and NUCLEAR MAGNETIC RESONANCE Description and Specifications for Lab Tenders
ELECTRON SPIN RESONANCE and NUCLEAR MAGNETIC RESONANCE.
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.
NUCLEAR MAGNETIC RESONANCE
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.