WO2011102094A1 - マルチマイクロホローカソード光源および原子吸光分析装置 - Google Patents
マルチマイクロホローカソード光源および原子吸光分析装置 Download PDFInfo
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- WO2011102094A1 WO2011102094A1 PCT/JP2011/000685 JP2011000685W WO2011102094A1 WO 2011102094 A1 WO2011102094 A1 WO 2011102094A1 JP 2011000685 W JP2011000685 W JP 2011000685W WO 2011102094 A1 WO2011102094 A1 WO 2011102094A1
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- light source
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- micro hollow
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
- H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
- H01J65/046—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using capacitive means around the vessel
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
Definitions
- the present invention relates to a multi-micro hollow cathode light source and an atomic absorption spectrometer that can be used for multi-element simultaneous absorption analysis and capable of simultaneous emission of multiple elements.
- Atomic absorption spectrometry is known as a method for measuring the amount of trace metals contained in a sample with high accuracy. This is a method of analyzing the amount of trace metals contained in a sample by atomizing the sample at a high temperature and irradiating the atmosphere with light to measure an absorption spectrum.
- the light source used in this analysis method requires a light source that emits the emission line spectrum of the element to be measured, and in order to simultaneously measure a plurality of elements, the light source that emits light having the emission line spectrum of those elements. Is required.
- Patent Document 1 A multi-micro hollow cathode light source is described in Patent Document 1 as a light source that emits light having such multiple element emission line spectra.
- an anode plate, an insulating plate, and a cathode plate made of copper or copper alloy are laminated, and a plurality of through holes having a diameter of 1 cm or less are provided to penetrate the anode plate, and a desired hole is formed in the opening of the through hole of the cathode plate
- a light source that emits emission line spectra of a plurality of metal elements is realized by disposing each metal plate from which emission line spectra can be obtained. That is, the light source is composed of a point light source by a plurality of hollow cathode discharges for each desired metal element.
- the multi-micro hollow cathode light source of Patent Document 1 is composed of a plurality of point light sources by hollow cathode discharge, it is difficult to control each discharge.
- the light of the multi-micro hollow cathode light source disclosed in Patent Document 1 is used, it is necessary to construct an optical path for each point light source, which causes a problem that the construction of the optical path is complicated and expensive.
- an object of the present invention is to realize a light source having emission line spectra of a plurality of elements while being a single point light source by hollow cathode discharge.
- a multi-micro hollow cathode light source that generates micro hollow plasma in an atmospheric gas and uses a cathode plate made of a metal having a high secondary electron emission coefficient, an insulating plate, and a cathode plate. And an anode plate disposed with an insulating plate interposed therebetween, a cathode plate, an insulating plate, one hole having a diameter of 1 cm or less penetrating the anode plate, and different elements corresponding to a plurality of emission line spectra to be obtained.
- the cathode plate has a plurality of metal pieces and an atmosphere gas.
- the cathode plate has a plurality of grooves extending radially from the hole in the center, and the plurality of metal pieces are embedded in each groove. It is the multi micro hollow cathode light source characterized by the above-mentioned.
- the amount of the metal piece may be changed for each material.
- the amount of the metal piece can be easily changed depending on the thickness and the number of sheets, and the thickness and the number of pieces can be easily adjusted by changing the width of the groove of the cathode plate.
- a plurality of metal pieces may be embedded in the groove, and the metal pieces may be made of different materials. Moreover, you may embed the metal piece of the same material in some among several groove
- the spectral intensity of each metal element can be controlled by the amount of each metal piece.
- the pattern of the plurality of grooves is arbitrary as long as it is a pattern extending radially around the hole, for example, a pattern in which four grooves extend in a cross shape.
- the groove of the cathode plate desirably penetrates in a direction perpendicular to the main surface of the cathode plate.
- the axial length of the hole of the metal piece embedded in the groove is increased, and the area of each metal piece exposed on the side surface of the hole can be increased, so that the efficiency with which the metal piece is sputtered is improved and the spectrum of the metal element is increased. This is because the strength increases.
- the number of grooves is preferably about 2 to 8
- the width of the groove is preferably about 0.1 to 0.9 times the diameter of the hole.
- the diameter of the hole is more preferably 1 mm or less. This is because the plasma can be confined at high density in the hole. It is also desirable to obtain a point light source.
- the light source of the present invention is assumed to be used at atmospheric pressure or a pressure slightly lower than this, but it is used under pressure when considering broad light emission such as excimer. It is also possible to do. In general, the higher the pressure of the atmospheric gas, the smaller the diameter of the hole. In consideration of the pressure used as described above, the diameter of the hole is preferably 10 ⁇ m or more.
- the diameter of the holes in the insulating plate is desirably slightly larger than the diameters of the holes in the cathode plate and the anode plate. Specifically, the diameter is preferably 100 to 1000 ⁇ m larger than the diameter of the holes of the cathode plate and the anode plate. This is to prevent the insulating plate from being dissolved during discharge.
- an inert gas such as He, Ne, Ar, Kr, or Xe as the atmospheric gas.
- He or Ne is desirable to use He or Ne. This is because the efficiency of secondary electron emission from the metal is increased.
- the metal having a high secondary electron emission coefficient that is a material of the cathode plate is, for example, copper, copper alloy, silver, silver alloy, molybdenum, molybdenum alloy, tungsten, tungsten alloy, or the like.
- a metal having a secondary electron emission coefficient of 0.2 or more is more desirable, and a metal having 1.0 or more is more desirable.
- copper or a copper alloy is desirable. This is because it is inexpensive and easily available and has a high secondary electron emission coefficient and high thermal conductivity.
- the anode plate is also preferably copper or a copper alloy.
- the second invention is the multi-micro hollow cathode light source according to the first invention, wherein the metal having a high secondary electron emission coefficient is copper or a copper alloy.
- the third invention is a multi-micro hollow cathode light source according to the first or second invention, wherein the atmospheric gas is made of helium.
- the fourth invention is a multi-micro hollow cathode light source according to the first to third inventions, wherein the hole has a diameter of 1 mm or less.
- a fifth aspect of the invention is an atomic absorption spectrometer that simultaneously measures multielements, comprising the multi-micro hollow cathode light source according to the first to fourth aspects of the invention.
- a plurality of metal pieces exposed on the side wall of the hole of the cathode plate can be efficiently sputtered simultaneously, and a high-density plasma can be generated by a plurality of metal elements.
- the light of the bright line spectrum corresponding to a plurality of desired metal elements can be obtained.
- the light source of the present invention is a single point light source. Therefore, the construction of an optical path for using light becomes very simple, and if an atomic absorption analyzer or the like is configured using the light source of the present invention, the cost of the apparatus can be reduced. Since the discharge is in one hole, the discharge control is easy. Further, the intensity of the emission line spectrum can be easily controlled by the number of metal pieces to be embedded.
- FIG. 3 is a diagram illustrating a configuration of a multi-micro hollow cathode light source according to the first embodiment.
- FIG. 3 is a cross-sectional view showing the configuration of the electrode plate 1. The top view which looked at the electrode plate 1 from the cathode plate 11 side. The graph which showed the emission spectrum.
- FIG. 3 is a diagram showing a configuration of an atomic absorption analyzer of Example 2.
- FIG. 1 is a diagram showing a configuration of a multi-micro hollow cathode light source according to the first embodiment.
- the multi-micro hollow cathode light source includes an electrode plate 1, a housing 2, a lens 3, and an electrode plate fixing portion 4.
- the housing 2 is made of glass, and the inside is a sealed cylindrical cavity.
- An electrode plate fixing portion 4 is provided inside the housing 2.
- the electrode plate fixing portion 4 fixes the electrode plate 1 inside the housing 2 so that the surface direction thereof is the axial direction of the cylinder.
- Helium gas is sealed inside the housing 2.
- the helium gas inside the housing 2 may be recirculated or the internal pressure may be adjusted.
- the internal pressure is preferably 0.01 to 0.1 atm.
- FIG. 2 is an enlarged cross-sectional view showing the configuration of the electrode plate 1.
- the electrode plate 1 includes a cathode plate 11, an insulating plate 12, an anode plate 13, and a metal piece 14.
- the insulating plate 12 is disposed so as to be sandwiched between the cathode plate 11 and the anode plate 13.
- the cathode plate 11 and the anode plate 13 are made of copper, and the insulating plate 12 is made of ceramic. Wiring is connected to the cathode plate 11 and the anode plate 13, and is connected to a power supply device.
- the cathode plate 11 is configured to be grounded and a positive voltage is applied to the anode plate 13 by the power supply device.
- the anode plate 13 may be grounded and a negative voltage may be applied to the cathode plate 11.
- the thickness of the cathode plate 11 is 1 mm, and the thickness of the insulating plate 12 and the anode plate 13 is 0.3 mm. Moreover, the cathode plate 11, the insulating plate 12, and the anode plate 13 are circular, and the diameter is 2 cm. Circular holes 15a, 15b, and 15c are provided at the centers of the cathode plate 11, the insulating plate 12, and the anode plate 13, respectively. The centers of these holes 15a to 15c are made to coincide with each other, and the holes 15 that pass through continuously are formed. It is composed.
- the hole 15a of the cathode plate 11 and the hole 15c of the anode plate 13 have a diameter of 1 mm, and the hole 15b of the insulating plate 12 has a diameter of 1.2 mm.
- the reason why the hole 15b of the insulating plate 12 is slightly larger than the hole 15a of the cathode plate 11 and the hole 15c of the anode plate 13 is to prevent the insulating plate 12 from being melted during discharge.
- FIG. 3 is a plan view of the electrode plate 1 viewed from the cathode plate 11 side.
- the cathode plate 11 is provided with four linear grooves 16 extending in a cross shape continuously from the hole 15a with the hole 15a as the center.
- the groove 16 penetrates the cathode plate 11.
- the width of the groove 16 is 0.2 mm and the length is 6 mm.
- Four metal pieces 14 of different materials are inserted and embedded in the four grooves 16, respectively.
- the four metal pieces 14 are made of Zn, Cd, Pb, and Cr, respectively.
- the metal piece 14 has a rectangular plate shape of 1 mm ⁇ 5 mm and a thickness of 0.2 mm.
- the helium gas sealed in the housing 2 is ionized, and plasma is generated inside the hole 15 and in the vicinity of the opening. Ions in the plasma are attracted to and collide with the cathode plate 11 by an electric field, and Cu and electrons constituting the cathode plate 11 are ejected by the ion bombardment.
- the ejected electrons are called secondary electrons, and have the effect of promoting ionization of new atoms in the plasma, so that plasma can be generated efficiently.
- the cathode plate 11 since copper having a high secondary electron emission coefficient is used for the cathode plate 11, plasma can be generated with high density inside the hole 15 and in the vicinity of the opening.
- the high-density plasma generated in the hole 15 efficiently sputters the four metal pieces 14 exposed on the side wall of the hole 15a.
- plasma of five metal elements of Zn, Cd, Pb, Cr, which are metal elements constituting each metal piece 14, and Cu, which is a material of the cathode plate 11 can be generated at high density.
- the emission spectrum by the micro hollow cathode discharge has emission line spectra of five metal elements of Zn, Cd, Pb, Cr, and Cu.
- Example 1 As described above, according to the multi-micro hollow cathode light source of Example 1, it is possible to obtain light having emission line spectra of a plurality of metal elements while being one point light source by micro hollow cathode discharge.
- FIG. 4 is a graph showing the measurement results of the emission spectrum.
- the current value was 25 mA, and the internal pressure was 0.05 atm. From this graph, the emission line spectra of Zn at a wavelength of 213 nm, Cr at a wavelength of 357 nm, Pb at a wavelength of 283.3 nm, Cu at a wavelength of 324 nm, and Cd at a wavelength of 228 nm can be confirmed. It can be seen that light having a light intensity was obtained from a multi-micro hollow cathode light source. The emission intensity from Pb and Cr is weak, and clear bright lines are not obtained as compared with Zn, Cu and Cd. However, the width of the groove 16 is increased to increase the number of metal pieces 14 made of Pb and Cr, or metal By making the piece 14 thicker, it is possible to increase the emission intensity of Pb and Cr, and to control so as to obtain a clearer emission line.
- Example 2 is an example of an atomic absorption spectrometer using the multi-micro hollow cathode light source of Example 1.
- the atomic absorption analyzer includes the multi-micro hollow cathode light source 100 of Example 1, a collimator lens 101, a sputtering device 102, a condenser lens 103, and a light receiving element array 104. ing.
- the multi-micro hollow cathode light source 100 is a light source that emits light having emission line spectra of a plurality of metal elements to be measured.
- the sputtering apparatus 102 is an apparatus that converts a sample into plasma.
- the light having the emission line spectra of a plurality of metal elements from the multi-micro hollow cathode light source 100 is collimated by the collimating lens 101 and then irradiated to the plasma 105 in the sputtering apparatus 102.
- the parallel light transmitted through the plasma 105 is collected by the condenser lens 103 and reaches the light receiving element array 104. Thereby, a plurality of metal elements to be measured in the plasma 105 can be identified, and the density of the plurality of metal elements can be simultaneously quantified by measuring the absorption rate of the elements.
- this atomic absorption spectrometer uses the multi-micro hollow cathode light source 100 of Example 1 as the light source, there is one optical axis, and the construction of the optical path from the light source to the light receiving element array 104 is very simple. . Therefore, the atomic absorption spectrometer can be made small and low cost.
- Example 2 as a method of atomizing the sample at a high temperature, a method of generating plasma by sputtering was used. However, methods conventionally used in atomic absorption analysis such as laser ablation, flame, and electric heating can also be used. Good.
- the multi-micro hollow cathode light source of the present invention can be used for atomic absorption analysis and the like.
- Electrode plate 2 Housing 3: Lens 4: Electrode plate fixing part 11: Cathode plate 12: Insulating plate 13: Anode plate 14: Metal piece 15: Hole 16: Groove 100: Multi-micro hollow cathode light source 101: Collimating lens 102: Sputtering device 103: Condensing lens 104: Light receiving element array
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- Spectroscopy & Molecular Physics (AREA)
- Electromagnetism (AREA)
- Biochemistry (AREA)
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Abstract
Description
2:筐体
3:レンズ
4:電極板固定部
11:カソード板
12:絶縁板
13:アノード板
14:金属片
15:孔
16:溝
100:マルチマイクロホローカソード光源
101:コリメートレンズ
102:スパッタ装置
103:集光レンズ
104:受光素子アレイ
Claims (5)
- 雰囲気ガス中において、マイクロホロープラズマを生成して光源とするマルチマイクロホローカソード光源において、
2次電子放出係数の高い金属からなるカソード板と、
絶縁板と、
前記カソード板に対して前記絶縁板を介在させて配設されたアノード板と、
前記カソード板、前記絶縁板、前記アノード板を貫通する直径1cm以下の1つの孔と、
得るべき複数の輝線スペクトルに対応した、それぞれ異なる元素からなる複数の金属片と、
雰囲気ガスと、
を有し、
前記カソード板は、前記孔を中心とし、その孔に連続して放射状に伸びた複数の溝を有し、
複数の前記金属片は、各前記溝に埋め込まれている、
ことを特徴とするマルチマイクロホローカソード光源。 - 前記2次電子放出係数の高い金属は、銅または銅合金であることを特徴とする請求項1に記載のマルチマイクロホローカソード光源。
- 前記雰囲気ガスは、ヘリウムからなることを特徴とする請求項1または請求項2に記載のマルチマイクロホローカソード光源。
- 前記孔の直径は、1mm以下であることを特徴とする請求項1ないし請求項3のいずれか1項に記載のマルチマイクロホローカソード光源。
- 多元素を同時に測定する原子吸光分析装置において、
請求項1ないし請求項4のいずれか1項に記載のマルチマイクロホローカソード光源を有することを特徴とする原子吸光分析装置。
Priority Applications (2)
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US13/578,171 US8638034B2 (en) | 2010-02-22 | 2011-02-08 | Multi-micro hollow cathode light source and atomic absorption sepctrometer |
CN201180010218.XA CN102770938B (zh) | 2010-02-22 | 2011-02-08 | 多微空心阴极光源和原子吸收光谱仪 |
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JP2010-036315 | 2010-02-22 | ||
JP2010036315A JP5305411B2 (ja) | 2010-02-22 | 2010-02-22 | マルチマイクロホローカソード光源および原子吸光分析装置 |
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WO2011102094A1 true WO2011102094A1 (ja) | 2011-08-25 |
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US (1) | US8638034B2 (ja) |
JP (1) | JP5305411B2 (ja) |
CN (1) | CN102770938B (ja) |
WO (1) | WO2011102094A1 (ja) |
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EP3417478B1 (en) * | 2016-02-17 | 2022-04-06 | Accustrata, Inc. | System and method for monitoring atomic absorption during a surface modification process |
CN107036976A (zh) * | 2016-12-01 | 2017-08-11 | 昆山书豪仪器科技有限公司 | 一种空心阴极光源 |
DE102019103035A1 (de) * | 2019-02-07 | 2020-08-13 | Analytik Jena Ag | Atomabsorptionsspektrometer |
CN114088690B (zh) * | 2021-11-09 | 2023-07-21 | 哈尔滨工业大学 | 一种开放环境下气体杂质的分析检测装置及方法 |
Citations (3)
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WO2004107825A1 (ja) * | 2003-05-30 | 2004-12-09 | Tokyo Electron Limited | プラズマ源及びプラズマ処理装置 |
JP2005285679A (ja) * | 2004-03-30 | 2005-10-13 | Toshio Goto | アーク放電陰極、アーク放電電極及びアーク放電光源 |
JP2007257900A (ja) * | 2006-03-21 | 2007-10-04 | Univ Nagoya | マルチマイクロホローカソード光源及び多元素同時吸光分析装置 |
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CN2063631U (zh) * | 1990-01-03 | 1990-10-10 | 北京有色金属研究总院 | 可见紫外分子吸收光谱空心阴极灯 |
CN2411468Y (zh) * | 1999-12-29 | 2000-12-20 | 吴安林 | 多阴极元素空心阴极灯 |
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- 2010-02-22 JP JP2010036315A patent/JP5305411B2/ja active Active
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2011
- 2011-02-08 WO PCT/JP2011/000685 patent/WO2011102094A1/ja active Application Filing
- 2011-02-08 CN CN201180010218.XA patent/CN102770938B/zh active Active
- 2011-02-08 US US13/578,171 patent/US8638034B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2004107825A1 (ja) * | 2003-05-30 | 2004-12-09 | Tokyo Electron Limited | プラズマ源及びプラズマ処理装置 |
JP2005285679A (ja) * | 2004-03-30 | 2005-10-13 | Toshio Goto | アーク放電陰極、アーク放電電極及びアーク放電光源 |
JP2007257900A (ja) * | 2006-03-21 | 2007-10-04 | Univ Nagoya | マルチマイクロホローカソード光源及び多元素同時吸光分析装置 |
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US20130027697A1 (en) | 2013-01-31 |
CN102770938A (zh) | 2012-11-07 |
US8638034B2 (en) | 2014-01-28 |
JP5305411B2 (ja) | 2013-10-02 |
CN102770938B (zh) | 2015-05-13 |
JP2011171251A (ja) | 2011-09-01 |
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