Abstract:
Provided is an electron source which provides a stable electron beam even when vibration is applied from external to a device which uses the electron source. The electron source is provided with a needlelike chip (1) having an electron emitting section at one end; a cup-like component (6) bonded to the other end of the needlelike chip (1); and a filament (3) for heating the cup-like component.(6). The filament (3) is arranged in a gap inside the cup-like component (6), in a noncontact state to the cup-like component (6).
Abstract:
An electron beam device for applying a primary electron beam onto a sample, and detecting a secondary electron beam produced from a sample surface by the irradiation to evaluate the sample surface, characterized in that the cathode of an electron gun for emitting primary electron beam have a plurality of emitters disposed at intervals on one circle centered on the optical axis of a primary electron optical system and emitting a primary electron beam, and the plurality of emitters are disposed so that points projected on a line parallel to the scanning direction of the primary electron beam are arranged at equal intervals.
Abstract:
A charged particle emitting assembly comprises an emitter member (5) for emitting charged particles of one polarity. A tubular shield electrode (6) circumferentially surrounds the emitter member and is held in use at the same polarity as the charged particles. A tubular accelerating electrode (7) is positioned substantially coaxially with the shield electrode (6) and is held in use at the opposite polarity to the shield electrode. The arrangement is such that charged particles from the emitter member (5) initially spread laterally outwardly and then are focused into a beam which passes through the tubular accelerating electrode (7).
Abstract:
The source of electrons is a nanotip in a vacuum as used in near field microscopy. The source of ions is a similar nanotip in vacuum supplied with liquid metal (gallium) as in a liquid-metal ion source. Electrons or ions from this nanometre-sized tip are extracted by centralising the tip over an aperture plate and applying a suitable voltage to the tip. The electrons (ions) pass through this plate and are accelerated up to several keV using a nanoscale/microscale accelerating column before being focussed using further microscale (or nanoscale) cylindrical lenses. The final element is an aberration corrected miniature (or sub-miniature) einzel lens which can focus the beam at several millimetres from the end of the instrument.
Abstract:
A tetrode (four electrode) gun (202) is described which allows the adjustment of both variable high brightness and illumination uniformity in the profile of the electron beam. This is achieved by providing an electrostatic focusing electrode (18) between the cathode (2) and the anode (8) within the electron gun. The focusing electrode is positively biased to a few keV and allows the image of the cathode to be focused at infinity. The addition of a focusing electrode enables both variable brightness and illumination uniformity by adjustment of the bias of a grid (4) which is mounted below the cathode to maintain constant emission, while adjusting the bias of the focusing electrode to obtain the optimal beam cross-sectional uniformity.
Abstract:
Disclosed is an electron gun in which the beam shaping aperture, smaller than the source crossover, becomes the object forthe succeeding imaging system in an electron beam column of scanning electron microscopes, electron beam lithography machines and the like. The beam forming aperture is located in or near the plane of the anode so that the source crossover alone illuminates the beam forming aperture.
Abstract in simplified Chinese:一具有一发射电子的电子源之电子枪系包括:一加速电极,其配置为面对电子源的一电子排放表面,且其使电子加速;一抽取电极,其配置于电子发射表面与加速电极之间,其具有一使中心位于光轴上且面对电子发射表面之球型凹形表面,且其自电子发射表面抽取一电子;及一抑制器电极,其相对于电子发射表面配置在与抽取电极相对之侧上,且其抑制来自电子源的一侧表面之电子发射。电子枪中,电场被施加至电子发射表面同时电子源在一不造成电子源的一材料升华之范围中被保持在一低温度,以造成电子源发射一热埸发射电子。