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Quasicontinuous or continuous laser angle-resolved photoelectron spectrum analyzer

A technology of photoelectron energy spectrum and electron energy analysis, which is applied in the direction of material analysis, measuring device, and material analysis by using wave/particle radiation. It can solve problems such as weak luminous flux, very high surface processing requirements, and poor energy resolution. Improved energy resolution and momentum resolution, shortened measurement time, and improved energy resolution

Active Publication Date: 2007-07-11
INST OF PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of synchrotron radiation light source is expensive, and the practical energy resolution is worse than 10meV; although the energy resolution of gas discharge light source can reach 1.2meV at best, its large spot and weak luminous flux make it difficult to be used in modern advanced high-resolution electronics. Angle-resolved work in energy analyzer mode
In addition, the two light sources in the prior art have a common weakness, that is, the beam current intensity is not very high, generally less than 1013 photons / s, and the experiment requires very high surface processing of the sample.
At present, although there are attempts to use laser as a light source, it is difficult to overcome the influence of space charge effect and mirror charge effect due to the use of pulsed laser.

Method used

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  • Quasicontinuous or continuous laser angle-resolved photoelectron spectrum analyzer

Examples

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Embodiment 1

[0023] Make a quasi-continuous laser angle-resolved photoelectron spectrum analysis device of the present invention according to Fig. 1, comprise vacuum chamber 10, there is the sample stage 12 that is used to fix sample 11 and be arranged on described sample stage 12 side electronic energy analysis inside vacuum chamber 10 A laser 14 is arranged at the laser entrance (not shown in the figure) of the vacuum chamber 10, so that the laser light emitted by the laser 14 enters the vacuum chamber 10 through the entrance and enters the sample in the sample chamber 12 11 on.

[0024] Each part in this embodiment is described in detail below:

[0025] The laser 14 is a 193nm (nanometer) all-solid-state laser, the energy of the emitted laser photons is 6.42eV (electron volts), and the repetition frequency of the emitted quasi-continuous laser is 10 kHz.

[0026] The vacuum chamber has a laser entrance that allows the laser to be incident. After the sample stage 12 with the sample 11 f...

Embodiment 2

[0032] On the basis of embodiment 1, make a continuous laser angle-resolved photoelectron spectrum analysis device of the present invention according to Fig. 2: laser 14 is the gas laser of 457.9nm, the laser photon energy that sends is 2.7eV, and the laser that sends is continuous output . A nonlinear optical crystal 20, and a first cavity mirror 21 and a second cavity mirror 22 are placed on the light-emitting optical path of the laser to realize intracavity frequency doubling (frequency conversion) for the continuous laser output from the laser, and to obtain a photon with a photon energy of 5.4eV. Continuous laser light, incident on the sample. The nonlinear optical crystal 20 is a barium metaborate (BBO) crystal. The electronic energy analyzer adopts the product sold in the market, which is a spherical fan analyzer.

[0033] Others are the same as in Example 1.

Embodiment 3

[0035] According to FIG. 2, a continuous laser angle-resolved photoelectron spectrum analysis device of the present invention is fabricated, and the nonlinear optical crystal 20 in Embodiment 2 is replaced by a nonlinear optical crystal laser frequency conversion coupler. The nonlinear optical crystal laser frequency conversion coupler is a device that uses a nonlinear optical crystal combined with a prism to apply to laser frequency conversion. The nonlinear optical crystal in the laser frequency conversion coupler is KBe 2 BO 3 f 2 (KBBF, potassiumdifluo-diberryllo-borate) crystal, the prism is a 45° right-angle prism. Those skilled in the art can complete the frequency conversion coupler according to the known technology, for details, please refer to the patent ZL01115313.X. In this way, a continuous laser with a photon energy of 5.4eV can also be obtained.

[0036] Others are identical with embodiment 2.

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Abstract

The quasi continuous or continuous angular resolution photoelectron spectrum analyzer comprises the vacuum chamber with sample bench for fixed handling of samples and electrical energy analyzer at one side of the sample bench, a laser at the entry of the vacuum laser, with the laser coming to the vacuum chamber lighting the sample on the bench, with photoelectron energy higher than 5 electro volt, with the emitted laser being quasi continuous or continuous. It can improve energy resolution ratio, dynamic resolution ratio, with the feature of highly efficient, simple and cheap.

Description

technical field [0001] The invention relates to a photoelectron energy spectrum analysis device, in particular to an ultra-high energy resolution angle-resolved photoelectron energy spectrum analysis device using a quasi-continuous or continuous laser as a light source. Background technique [0002] Since the macroscopic physical properties of any material are dominated by its microscopic electron motion process, in order to understand, utilize and control many novel physical phenomena in advanced materials, it is necessary to study their electronic structures in depth. Among all experimental techniques, photoelectron spectroscopy is the most direct and powerful tool for studying the electronic structure of materials. The working principle of photoelectron spectroscopy is: when the light beam is irradiated on the sample, the electrons in the material will escape from the sample due to the photoelectric effect. By measuring the distribution of the intensity of photoelectrons ...

Claims

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Application Information

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IPC IPC(8): G01N23/227G12B17/02
Inventor 周兴江陈创天许祖彦刘国东朱镛王桂玲张国春张鸿博王晓阳周勇张文涛刘海云赵林孟建桥董晓莉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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