SU1283634A2 - Electron paramagnetic resonance spectrometer - Google Patents

Abstract

The invention relates to the technique of radio-spectroscopy of electron paramagnetic resonance, allows you to extend the functionality of the spectrometer, namely, provides the ability to measure the transverse relaxation time. The magnetic field applied to the sample, created by the electromagnet, is modulated by means of a modulating oscillator. The selective amplifier extracts the signal at the modulation frequency. This signal is detected by a phase-sensitive detector, the reference signal to which is supplied from the modulating oscillator and fed to the input of a recording device, to another input of which a proton resonance signal is output from the proton fluxmeter output. The intensity of the magnetic field is measured by a proton fluxmeter at extreme values of the signals arriving at the inputs of a recording device. Based on the jg-value of the magnetic field strengths corresponding to j) the inflection points of the absorption line and the mixed EPR line, the transverse relaxation time is calculated. 1 il.

Description

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11283634

The invention relates to the technique of adiospectroscopy, in particular to electron paramagitic resonance (EPR) spectrometers, and is additional to auth. No. 785701.

The purpose of the invention is the expansion of functional vozmozhstey, namely the possibility of measuring the time of transverse relaxation.

The drawing shows the block diagram of the proposed spectrometer.

The spectrometer contains a microwave generator 1, a directional coupler 2, a circulator 3, a measuring resonator 4, a balanced detector 5, a phase shifter 6, an indicator 7, an electromagnet 8, a modulating generator 9, a selective amplifier 10, a phase-sensitive detector 11, a recording device 12, a proton flux meter 13, the detector 14 and the indicator 15.

The spectrometer works as follows.

The microwave generator 1 creates a microwave field, which, passing through the directional coupler 2 and the circulator 3, acts on the sample in the measuring resonator 4. At the time of the resonance, the power reflected from the measuring resonator changes. This change is transmitted by the circulator 3 to the input of the balanced detector 5, to the other input of which, through the phase shifter 6, the reference microwave power is supplied from the directional coupler 2. By setting the phase of the microwave oscillations using the phase shifter 6, the alansnogo detector 5 for signal dispersion, absorption, or mixed EPR signal. The output signal of the balanced detector 5 is detected by the indicator 7. A constant magnetic field applied to the sample, created by the electromagnet 8, is modulated by the modulating oscillator 9. The dependence in the EPR region of the amplitude of the microwave signal reflected from the measuring resonator is dependent on the intensity of the magnetic field applied to the sample causes amplitude

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modulation of the reflected signal. After the reflection of the reflected microwave signal by the balanced detector 5 by the selective amplifier 10, the signal with the modulation frequency is amplified and amplified. This signal is detected by a phase-sensitive detector 11, the reference signal to which is supplied from the modulating oscillator 9, and is fed to the recording device 12. The resonant conditions are passed by sweeping the electromagnet 8 field. The intensity of the constant magnetic field is measured by a proton flux meter 13, the sensor is located in the working gap of the core of the electromagnet 8. The proton resonance signal detected by the proton fluxmeter 13 is fed to the second input of the recording device 12. On p strength of the magnetic field is measured at extreme values of signals by postulating payupschh on the recording unit 12. The signal detected by absorption by the detector 14 and the indicator 15 is recorded.

Claims (1)

Invention Formula Spectrometer of electron paramagnetic resonance auth.St. No. 785701, characterized in that, in order to expand its functionality, namely, to enable measurement of transverse relaxation time, a proton meter, a 1X flux meter, a modulating oscillator and a series-connected selective amplifier, a phase-sensitive detector and a recording device, are introduced into the spectrometer, while the proton flux meter input is connected to an electromagnet, and the output is connected to the second input of the registering device, the second input of the phase-sensitive detector is connected to an input modulating The second generator is connected to the electromagnet, and the second output of the balanced detector is connected to the input of the selective amplifier.