SU534681A1 - Electron paramagnetic resonance spectrometer - Google Patents

Description

3

The spectrometer contains a scanner and a magnetic field stabilizer 1 with coils 2 wound on the magnet 3 popus, between which there is a resonant cell 4j of the microwave oscillation to which comes from the microwave unit 5. The resonant cell is connected to the receiver unit 6, which is output through a two-channel the gate integrator 7 is connected to the indicator unit 8. The modulator 9 consists of an RF oscillation generator 10, through an amplifier 11 connected to the modulating stage 12, and a pulse generator 13, also connected to the modulating stage through a standby In addition, the pulse generator 13 is connected to a two-channel strobe integrator 7, and the modulating stage 12 is connected to the modulating coils in the resonant cell 4.

The spectrometer works as follows. The resonant cell 4 is superimposed by a magnetic field produced in the scanner and stabilization unit 1, which slowly varies linearly. This also comes through the waveguide channel microwave signal from block 5.

When the magnetic field reaches a certain value, an ESR signal appears at the output of the resonant cell, which is proportional to the microwave power absorbed in the cell. The DPR signal is present at the input of a two-channel strobe integrator 7 only during the supply of a radio pulse to the modulation coils of the resonant cell.

The radio pulse modulation signals are generated in the modulation unit 9 according to the graphs shown in FIG. 2. The frequency of the pulses produced by the pulse generator 13 may vary depending on the experimental conditions. The pulses of the generator 13 trigger the standby multivibrator 14, which gives out the rectangular pulses presented on graph N9 3. These pulses and harmonic oscillations from the RF generator 10 are fed to the modulating cascade 12, the radio pulses from which (see graph 4) are transmitted to the moto nagging resonators cells 4,

The pulses produced by the generator 13 are also fed to a two-channel strobe integrator 7, in which they form with strobe pulses presented in graphs nos. N9 5 and 6. From the graph number 6 it follows

that the zero channel gates appear during the absence of the DLS signal at the output of the receiving unit 6. Thus, a constant control of the zero line and accumulation of weak DSR signals of the spectrum of stable paramagnetic particles in the strobe integrator 7 occurs. The accumulated signal from the strobe integrator goes to the indicator 8

The use of radio pulse modulation in a spectrometer with a storage device of the type of a two-channel gate integrator expands its capabilities, since it allows one to determine the spectra of not only short-lived, but also stable paramagnetic particles.

Claims (1)

Invention Formula An electron paramagnetic resonance spectrometer containing a scanner and stabilization of a magnetic field with coils and a resonant cell connected to a modulator consisting of a series-connected amplifier and a high frequency generator, a microwave unit and a receiver unit, the output of which is connected through a two-channel integrator strobe an indicator unit, characterized in that, in order to determine the weak BSS signals of stable paramagnetic particles, a waiting multivibrator, a modulating stage and a generator are introduced into the modulator pulses, one of the outputs of which is connected with the input of a two-channel gate integrator, and through a waiting multivibrator - with one of the inputs of the modulating cascade, the other input of which is connected to the amplifier of high-frequency oscillations, and the output with a resonant cell. Sources of information, which are considered in the examination during examination: 1, Hugsen, Hyde, Pulsed ZPR spectrometer, Instruments for scientific research, 1974. T.45, No. o. u N1 AL -. N i PP -P .. N6 one