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Quasi-continuous or continuous laser spinning resolving photoelectron energy spectrum analysis device

A photoelectron energy spectrum and electronic energy analysis technology, applied in the direction of measuring devices, magnetic properties measurement, instruments, etc., can solve problems that are difficult to overcome, hinder synchronous acquisition, limit the wide application of materials and physics research, and reduce huge costs. Improved energy resolution and shortened measurement time

Active Publication Date: 2009-12-30
INST OF PHYSICS - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What is even more unfavorable is that, in order to further enhance the signal, almost all measurements use angle integration, thus losing the important electron momentum information of angle-resolved photoelectron spectroscopy.
These two major weaknesses hinder the ability of current photoelectron spectroscopy techniques to simultaneously obtain comprehensive information about the electronic states (i.e., energy, momentum, and spin) of materials, limiting their wide application in materials and physics research.
If a pulsed laser is used as a light source, it is difficult to overcome the influence of space charge effect and mirror charge effect

Method used

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  • Quasi-continuous or continuous laser spinning resolving photoelectron energy spectrum analysis device
  • Quasi-continuous or continuous laser spinning resolving photoelectron energy spectrum analysis device
  • Quasi-continuous or continuous laser spinning resolving photoelectron energy spectrum analysis device

Examples

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Embodiment 1

[0023] according to figure 1 Make a quasi-continuous or continuous laser spin-resolved photoelectron spectroscopy analysis device of the present invention, comprising a vacuum chamber 10, inside the vacuum chamber 10 there is a sample stage 12 for fixing a sample 11 and an electron energy analysis device arranged on one side of the sample stage 12 A laser 13 and a spin detector 14; a laser 15 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 15 enters the vacuum chamber 10 through the entrance and enters the on the sample 11 in the sample chamber 12.

[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 lase...

Embodiment 2

[0033] On the basis of Example 1, press figure 2 A continuous laser spin-resolved photoelectron spectroscopy analysis device of the present invention is made: the laser 15 is a 457.9nm gas laser, the energy of the emitted laser photons is 2.7eV, and the emitted laser is output continuously. 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.

[0034] Others are the same as in Example 1.

Embodiment 3

[0036] according to figure 2 To make a continuous laser spin-resolved photoelectron spectroscopy analysis device of the present invention, 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, see patent ZL01115313.X. In this way, a continuous laser with a photon energy of 5.4eV can also be obtained.

[0037] Others are identical with embodiment 2.

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Abstract

The invention discloses a quasi-continuous or continuous laser spin photoelectron spectroscopy analyzer, consists of vacuum chamber, specimen stand in the vacuum chamber for fixing and manipulating the specimen, and the electron energy analyzer and spin detector at the side of specimen stand; characterized in that still includes a laser at the laser light inlet of the vacuum chamber, the laser light sent by laser shall be injected into the vacuum chamber from its inlet and injected to the specimen on the specimen stand, the laser photon energy on the specimen is higher than 5 electron-volt; the laser light from the laser is a quasi-continuous laser or continuous laser. The advantage of the invention is improving the energy resolution, and momentum resolution, it is a high efficient, easy to operate, and low cost device for measuring the accurate electron spinning state of materials and even fully describe the electron state of materials.

Description

technical field [0001] The invention relates to a photoelectron energy spectrum analysis device, in particular to a spin resolution photoelectron energy spectrum analysis device using a quasi-continuous or continuous laser as a light source. Background technique [0002] The magnetic properties of materials are determined by the spin states of the electrons inside. The study of electron spin is not only of great scientific significance, but also closely related to the emerging spin flow and the application of spintronics in the information field. Spin-resolved photoelectron spectroscopy is the most direct experimental method to detect the spin state of electrons in materials, whether it is the exploration of spintronics materials, or the physics of quantum spin current phenomena and many novel quantum phenomena in advanced materials. Research is of great significance. The working principle of spin-resolved photoelectron spectroscopy is that when light is irradiated onto a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/12G01R33/00
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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