摘要:
In an accelerating tube which uses a conductive insulator, there is a possibility that the dopant concentration on a surface of the conductive insulator becomes non-uniform so that the surface resistance of the conductive insulator becomes non-uniform. Accordingly, a circumferential groove is formed on the inner surface of the conductive insulator accelerating tube in plural stages, and metal is metalized along inner portions of the grooves. When the resistance of a specific portion on the surface of the accelerating tube differs from the resistance of an area around the specific portion, the potential of the metalized region on the inner surface of the accelerating tube becomes a fixed value and hence, the potential distribution on the inner surface of the accelerating tube in the vertical direction can be maintained substantially equal without regard to the circumferential direction.
摘要:
In an accelerating tube which uses a conductive insulator, there is a possibility that the dopant concentration on a surface of the conductive insulator becomes non-uniform so that the surface resistance of the conductive insulator becomes non-uniform. Accordingly, a circumferential groove is formed on the inner surface of the conductive insulator accelerating tube in plural stages, and metal is metalized along inner portions of the grooves. When the resistance of a specific portion on the surface of the accelerating tube differs from the resistance of an area around the specific portion, the potential of the metalized region on the inner surface of the accelerating tube becomes a fixed value and hence, the potential distribution on the inner surface of the accelerating tube in the vertical direction can be maintained substantially equal without regard to the circumferential direction.
摘要:
In an electron microscope having a magnetic field immersion type cold-FE electron gun, the electron gun and the electron microscope are provided with high observation efficiency and the focal distance of the electron gun does not change during use. The degree of vacuum in the electron gun is improved with a getter pump for stabilization. Further, observation efficiency is improved by cleaning the electron source periodically and returning to recorded optical conditions on the occasion.
摘要:
The present invention has an object to provide a cold cathode field-emission electron gun with low aberration, to thereby provide a high-brightness electron gun even in the case of a large current. The present invention provides a field-emission electron gun which extracts an electron beam from a cathode and converges the extracted electron beam, the field-emission electron gun including: a magnetic field lens which is provided such that the cathode is disposed inside of a magnetic field of the lens; and an extraction electrode for extracting electrons from the cathode, the extraction electrode being formed into a cylindrical shape without an aperture structure. The present invention can provide an electron gun having a function of converging an electron beam using a magnetic field, the electron gun which is capable of reducing an incidental electrostatic lens action and has small aberration and high brightness.
摘要:
A width-measurement method of reducing or eliminating an error in measurement of a width of an object on a sample resulting from the dimension of the beam diameter, wherein a width-measured value of the object to be width-measured which has been obtained on the basis of a secondary signal obtained from secondary particles emitted from the sample having thereon the object to be width-measured is corrected with a value with respect to a dimension value of a beam diameter.
摘要:
The object of the present invention is to enable the optical axis of an electron beam of a field emission electron gun mounting thereon an electron gun composed of a fibrous carbon material to be adjusted easily. Moreover, it is also to obtain an electron beam whose energy spread is narrower than that of the electron gun. Further, it is also to provide a high resolution electron beam applied device mounting thereon the field emission electron gun. The means for achieving the objects of the present invention is in that the fibrous carbon material is coated with a material having a band gap, in the field emission electron gun including an electron source composed of a fibrous carbon material and an electrically conductive base material for supporting the fibrous carbon material, an extractor for field-emitting electrons, and an accelerator for accelerating the electrons. Moreover, it is also to apply the field emission electron gun to various kinds of electron beam applied devices.
摘要:
In a transport apparatus, a plurality of flat bodies are respectively aligned uprightly and juxtaposed laterally to form a block of the flat bodies, the block is loaded in a movable capsule, and the capsule is transported under the application of air flow through a transport pipeline. A loading mechanism having a pair of openable and closable holding arms is disposed to oppose a loading opening of a loading station, and an unloading mechanism having a pair of openable and closable holding arms is disposed to oppose an unloading opening of an unloading station.
摘要:
7.alpha.-Methoxy-3-p-sulfooxy or p-hydroxycinnamoyloxymethyl cephalosporin derivatives which are useful as antibiotics and as intermediates for the production of other 7.alpha.-methoxycephalosporin derivatives.
摘要:
The present invention has an object to provide a cold cathode field-emission electron gun with low aberration, to thereby provide a high-brightness electron gun even in the case of a large current. The present invention provides a field-emission electron gun which extracts an electron beam from a cathode and converges the extracted electron beam, the field-emission electron gun including: a magnetic field lens which is provided such that the cathode is disposed inside of a magnetic field of the lens; and an extraction electrode for extracting electrons from the cathode, the extraction electrode being formed into a cylindrical shape without an aperture structure. The present invention can provide an electron gun having a function of converging an electron beam using a magnetic field, the electron gun which is capable of reducing an incidental electrostatic lens action and has small aberration and high brightness.