JPH11230925A - Marker for electron spin resonance device - Google Patents

Abstract

(57) [Problem] To provide a marker system capable of improving the reproducibility of the insertion depth of a marker into a cavity resonator, adjusting the marker depth online, and performing computer management of the depth data. A motor rotates to change the insertion depth of a marker into a cavity, a conversion mechanism for converting a rotational force of the motor into a driving force in an insertion direction, and a transmission mechanism for transmitting the driving force. A flexible transmission rod and a moving element fixed with a marker driven by the movement of the transmission rod are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a marker used in an electron spin resonance apparatus.

[0002]

2. Description of the Related Art The marker of an electron spin resonance apparatus is ES.
Calibration of detection sensitivity by correcting the magnetic field strength of the device from the position of the marker signal appearing in the R spectrum to obtain the g value of the measurement sample, or correcting the Q value of the cavity resonator from the ESR signal strength of the marker And for improving the quantitativeness of the spin number of the measurement sample. Conventionally, a marker is a substance whose g value is already known, such as manganese divalent ion, chromium trivalent ion, TCNQ-Li (lithium complex of tetracyanoquinodimethane), and DPPH (diphenylpicrylhydrazyl). These materials have been used by inserting known quantities into cavity cavities. When inserting the marker into the cavity, a hole for insertion is made in the cavity, and a marker substance is filled in a quartz glass capillary tube slightly smaller than the diameter of the hole, and this capillary tube is inserted. The cavity is inserted through a small hole. FIG. 1 is a diagram showing the appearance of the most standard marker.
One end of the capillary tube 1 is inserted into the holder 2, and the insertion depth can be changed arbitrarily. When the capillary tube 1 is inserted deeply into the holder 2, the protruding portion of the capillary tube 1 from the holder 2 becomes shorter, and the insertion depth of the marker into the cavity resonator when this is fixed to the cavity resonator becomes shallower. When the capillary tube 1 is inserted shallowly into the holder 2, the protruding portion of the capillary tube 1 from the holder 2 becomes longer, and when this is fixed to the cavity resonator, the insertion depth of the marker into the cavity resonator becomes deeper. Become.
The tip portion of the holder 2 is a screw portion 3 which is fixed by screwing into a small hole portion of the cavity resonator.

[0003] The signal intensity of a marker decreases when it is inserted shallowly into the cavity resonator, and increases when it is inserted deeply. Therefore, in order to obtain a marker intensity close to the signal intensity of the sample being measured, the depth of insertion of the marker must be reduced. It was necessary to make appropriate adjustments for each measurement.

[0004]

The marker shown in FIG. 1 is extremely qualitative because there is no standard for adjusting the length of the protruding portion from the holder. And tried to set it to the same length again, it couldn't.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to enhance the reproducibility of the insertion depth of a marker into a cavity resonator, adjust the marker depth online, and perform computer management of depth data. Is to provide.

[0006]

In order to achieve this object, a marker for an electron spin resonance apparatus according to the present invention comprises: a motor that rotates to change the insertion depth of the marker into a cavity resonator; It is characterized by comprising a conversion mechanism for converting a force into a driving force in the insertion direction, a flexible transmission rod for transmitting the driving force, and a movable element fixed with a marker driven by the movement of the transmission rod. I have.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment of the present invention. In the figure, reference numeral 4 denotes a cavity resonator for resonating microwaves. Normally, the cavity resonator 4 has a cylindrical shape, and the microwave resonates so that the magnetic field component of the microwave becomes maximum in the direction along the central axis of the cavity.

In electron spin resonance, the stronger the microwave magnetic field acts on the sample, the stronger the signal intensity and the higher the sensitivity of the apparatus. Therefore, the measurement sample 5 has the maximum microwave magnetic field in order to obtain high sensitivity. It is inserted along the central axis of the cavity resonator 4. On the other hand, a small hole 7 for inserting a capillary tube 6 made of quartz glass filled with a marker standard sample (for example, manganese divalent ion) is provided on a side portion of the cavity resonator 4. As the capillary tube 6 inserted through the small hole 7 is inserted deeper into the cavity resonator 4 and approaches the center axis of the cavity, the microwave magnetic field acting on the capillary tube 6 increases, and a strong marker signal intensity is obtained. Will be able to

The insertion depth of the capillary tube 6 into the cavity resonator 4 is changed by a pulse motor 8 and a feed screw mechanism 9. That is, the rotational motion of the pulse motor 8 is converted into linear motion in the front-rear direction by the feed screw mechanism 9, and the transmission rod 11 covered by the outer tube 10 is formed.
Conveyed to. The transmission rod 11 is formed of a fluororesin or the like having low thermal expansion and has flexibility. Transmission rod 11
Is transmitted to push the moving element 12 to which the capillary tube 6 is connected, and the marker sample is inserted into the cavity resonator 4. At this time, a spring 13 is provided between the movable member 12 and an end of the marker body to suppress mechanical backlash of the movable member 12. The presence of the spring 13 is extremely important for improving the reproducibility of the marker signal intensity. Set the spring diameter to 0.
As a result of comparison between the three types of 4 mm, 0.5 mm, and 0.7 mm, it was found that in the present invention, the one having 0.4 mm suppressed the backlash most.

The pulse motor sets the pulse count number to 0.
It is possible to change from 0000 to 18250. In the present invention, the marker insertion depth is changed by 4 mm per 2500 counts. Since the pulse motor is digitally controlled by the external computer 14, not only the file depth can be managed as a digital value of the insertion depth of the marker into the cavity, but also the digital value is By arbitrarily setting, it is possible to remotely control the insertion depth of the marker.

As described above, digital remote control of the insertion depth of the marker from the external computer 14 is enabled, so that the reproducibility of the setting of the marker is remarkably improved, and the signal intensity of the marker itself is changed to the value of the unknown sample. It can be used as a standard spin number value when quantifying the spin number. This will open the way to substitute the value of the insertion depth of the marker (pulse count number) itself as the value of the standard spin number for quantifying the spin number of an unknown sample in the future.

Although a pulse motor is used as a marker driving source in this embodiment, a marker moving method using an ultrasonic motor which is not affected by a magnetic field is also possible.
In addition to the manganese divalent ion, a chromium trivalent ion, TCNQ-Li (lithium complex of tetracyanoquinodimethane), DPPH (diphenylpicrylhydrazyl), or the like can be used as the marker standard sample. .

[0013]

As described above, according to the present invention, since the marker system is controlled by the pulse motor drive, the marker conditions can be filed on a computer, and the setting reproducibility of the marker signal intensity can be improved. As a result, the marker signal intensity can be used as a standard spin number value when quantifying the spin number of an unknown sample.

[Brief description of the drawings]

FIG. 1 is a diagram showing a conventional example.

FIG. 2 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Capillary tube, 2 ... Holder, 3 ... Screw part,
4 ... cavity resonator, 5 ... measurement sample, 6 ... capillary tube, 7 ... small hole, 8 ... pulse motor, 9 ... feed screw mechanism, 10 ... outside Tube, 11 ... Transmission rod, 12 ...
Movable element, 13 ... spring, 14 ... external computer.

Claims (4)

[Claims] 1. A motor that rotates to vary the insertion depth of a marker into a cavity resonator, a conversion mechanism that converts the rotational force of the motor into a driving force in the insertion direction, and a device that transmits the driving force. A marker for an electron spin resonance apparatus, comprising: a flexible transmission rod according to any one of (1) to (4), and a movable element to which a marker driven by movement of the transmission rod is fixed. 2. The marker according to claim 1, wherein the motor is a stepping pulse motor. 3. The marker according to claim 1, wherein the motor is an ultrasonic motor. 4. A standard sample of the marker is any of divalent manganese ion, trivalent chromium ion, TCNQ-Li (lithium complex of tetracyanoquinodimethane), and DPPH (diphenylpicrylhydrazyl). Item 7. A marker for an electron spin resonance device according to Item 1.