SU974232A1

SU974232A1 - Pulse electron paramagnetic resonance spectrometer resonator

Info

Publication number: SU974232A1
Application number: SU802885157A
Authority: SU
Inventors: Всеволод Евгеньевич Хмелинский
Original assignee: Институт Химической Кинетики И Горения Со Ан Ссср
Priority date: 1980-02-19
Filing date: 1980-02-19
Publication date: 1982-11-15

Description

1one

Предлагаемое изобретение относитс к спектроскопии и может быть использовано в импульсных спектрометрах электронного парамагнитного резонанса (ЭПР) при наблюдении сигнала в виде спинового эхаThe present invention relates to spectroscopy and can be used in Pulsed Electron Paramagnetic Resonance (EPR) spectrometers when observing a spin echo signal.

Известны резонаторы спектрометра импульсного электронного парамагнитного резонанса (ЭПРС) 1, однако они, как правило, сложны и трудоемки в частотной настройке.Known resonators of the spectrometer pulsed electron paramagnetic resonance (EPRS) 1, but they are usually difficult and time-consuming in the frequency setting.

Наиболее близким по технической сущности к изобретению вл етс резонатор спектрометра импульсного ЭПР, содержащий корпус,полость дл двух ортогональных типов колебаний, обмотку модул ции пол ризующего магнитного пол , отверсти дл ввода подстраивающих частоты колебаний диэлектрических штырей, отверстие дл ввода образца и отверсти св зи , В этом резонаторе частота одного типа колебаний равна частоте возбуждающих импульсов, а частота второго типа колебаний равна частоте полезного сигнала, отличающейс от частоты возбуждающих импульсов на величину, пропорциональную амплитуде модул ции пол ризующего пол , осуществл емой с помощью модулирующей обмотки 2.The closest in technical essence to the invention is a resonator of a pulsed EPR spectrometer, comprising a housing, a cavity for two orthogonal oscillations, a modulating winding of a polarizing magnetic field, holes for introducing oscillatory frequencies of dielectric pins, a hole for introducing a sample and a communication hole, In this resonator, the frequency of one type of oscillation is equal to the frequency of the excitation pulses, and the frequency of the second type of oscillation is equal to the frequency of the useful signal that differs from the frequency of the excitation mpulsov an amount proportional to the amplitude modulation polarizing floor emoy effected via modulating winding 2.

Недостатком такого резонатора вл етс отсутствие полной геометрической симметрии, что приводит к тру10 доемкост м при настройке частот обо их типов колебаний из-за их вли ни друг на друга, а также и попаданию некоторой части возбуждающих импульсов на основной частоте и на The disadvantage of such a resonator is the absence of full geometric symmetry, which leads to trunks when tuning the frequencies of both types of oscillations due to their influence on each other, as well as the onset of a certain part of the exciting pulses at the fundamental frequency and on the other.

15 частотах спектральных составл ющих в канал приемника15 frequencies of spectral components per receiver channel

Цель изобретени - расширение функциональных возможностей резонатора путем частотной и геометрической раз20 е зки между обоими типами колебаний.The purpose of the invention is to expand the functionality of the resonator by frequency and geometric separation between both types of oscillations.

Claims

The goal is achieved in that the resonator of a pulsed electron paramagnetic resonance spectrometer, comprising a housing, a cavity for two orthogonal oscillation types, a modulating winding for a polarizing magnetic field, and an opening for introducing oscillating frequencies of dielectric pins, an opening for introducing a sample, and a communication hole, the modulation winding is located between the bases of the cavity parallel to them and forms with them a shielded STRIP LINE In the resonator, in which the cylinder has round bases, can oscillations of type E are expected, and in a resonator, the cavity of which has square bases, oscillations of type Na can be excited. Figure 1 shows an embodiment of the proposed resonator, in which the cavity is made in the form of a cylinder with round holes; Fig. 2 shows a schematic representation of the magnetic field lines of both oscillation modes. The resonator includes a housing 1, a cavity 2 (cylinder), an opening 3 for introducing an ampoule with sample 4, an opening 5 for introducing adjustment frequencies of dielectric pins 6 and 7, and a modulation winding 8 Cables 9s of communication holes 10 and 11, strips to the ends of 12 o The resonator housing 1 has a cylindrical cavity 2, at the bases of which along the axis of symmetry there are holes 3 for introducing the ampoule with sample 4 o In the bases of cavity 2 symmetrically with respect to the holes 3 and paral Along their axis there are holes 5 for two pairs of adjusting oscillation frequencies of dielectric pins 6 and 7o. The modulation winding 8 is located in a plane parallel to the base of cavity 2 and the cables 9 are connected to the generator of modulating pulses and to the final matched load 10, the cavity of the resonator is connected to the excitation pulse generator, and through the communication hole 11 with the signal receiver, the Resonator is placed in the magnet gap between the pole pieces 12, in which also along the axis of symmetry The opening for the introduction of a sample with a sample, Two types of oscillations are excited in cavity 2 of such a resonator. ,,,, and HnQ ,, Adjustment frequencies of oscillations; Dielectric pins 6 are located in the antinodes of the electric field of oscillations of the maximum magnetic field of oscillations. , Nl, therefore, they do not affect the frequency of the type and vice versa, the dielectric pins 7, which adjust the oscillation frequencies, located in the antinodes of the electric field of the fid oscillation, change the frequency of this type of oscillation, fie affecting the oscillations of the H type. The power of the excitation of pulses through the coupling coupling 10, oscillations of the 1st type are excited in the resonator, the frequency of which can be tuned in the peo .iaHc with the frequency of the excitation pulses using pins 6 After the end of the supply of a series of excitation pulses to the resonator in the modulation 8 (in the form of a loop), a modulating current of a rectangular shape enters the generator of modulating pulses, changing the magnetic field at the location of the sample by a certain amount of 4 Hp, and the frequency of the spin echo signal on it changes which values (RLN where or- gyromagnetic ratio. C (- spin echo excites the second type of resonator oscillation, the frequency of which can be tuned to resonance with the signal frequency using pins 7c. From the resonator, the useful signal is fed through the communication hole 11 to the receiver input. Due to the geometric symmetry of the resonator, almost complete tuning is achieved types of oscillations, as well as additional detuning of the excitation and reception channels. The width of the transmission band of the stripline line formed by the modulation loop and both bases cavity cavity reaches a value of 0-750 MHz, the claims of the resonator pulsed electron paramagnetic resonance spectrometer, comprising a housing, a cavity for oscillation of two orthogonal types, modulation winding of a polarizing magnetic field, holes for adjusting the oscillation frequency of dielectric pins, a sample insertion hole and communication holes, characterized in that,

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in order to expand the functional sources of information

capabilities of the resonator by frequency, taken into account in the examination and geometric unraveling of the coil 1, USSR author's certificate of both types, the winding of the module - NT 240786, class G 01 N 27/78, 19b9 "is located between the bases - $

2. Poole Ch. The EPR spectroscopic technique is parallel to them and forms with PII. M., Mir, 1970, p. 355-369 them shielded strip line. (prototype).

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