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Alkaline earth metal atom effective detecting method

A technology of alkaline earth metal and detection method, applied in the field of detection, can solve the problems of low efficiency, high laser power level requirements, narrow adaptation surface, etc., and achieve the effect of high detection efficiency

Inactive Publication Date: 2007-06-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings and problems of the existing technology for detecting atoms, such as low efficiency, narrow adaptability, not easy to operate, and high requirements on the power level of the laser, and propose a new technology developed by using the concept of resonance ionization. High-efficiency detection method for highly excited alkaline earth metal atoms

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  • Alkaline earth metal atom effective detecting method
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  • Alkaline earth metal atom effective detecting method

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preparation example Construction

[0022] The preparation of the highly excited atomic sample in the present invention: it is necessary to accurately control the temperature of the heating crucible, and the high-purity (above 99.5%) metal should be placed in a high vacuum (vacuum degree of 10 -4 Pa) heated to 580-630 degrees Celsius in the environment, so that the metal vapor is ejected from a small hole with a diameter of 2 mm on the side of the crucible. The collimation through two apertures makes the metal vapor into a beam of atoms with a high degree of collimation (between 8-12 degrees of parallelism). The beams of the first laser and the second laser are parallel and incident from the front window of the vacuum chamber; the beams of the third laser are antiparallel to them and incident from the rear window; the three beams are in the same line and incident on the atomic The beam direction is perpendicular. The purpose of controlling the atomic beam to be orthogonal to the three laser beams is to basicall...

example 1

[0039] Example 1: Detection of barium atoms in the 6s17d state.

[0040] Figure 1 shows the barium atom 6p measured in the present invention 1 / 2 Spectra of the 17d self-ionized state. It can be seen from FIG. 1 that the resonance peak of the self-ionized state is located in the vicinity of the wavelength of 493.7 nm. Therefore, when detecting atoms in the highly excited state of 6snd, the highest detection efficiency can be obtained only by fixing the wavelength of the third-step laser around 493.7 nm.

example 2

[0041] Example 2: Detection of barium atoms in multiple 6sns states.

[0042] Figure 2 shows the multiple 6p measured by the present invention 1 / 2 Spectra of ns self-ionized state, where n=10-20. Therefore, as long as the photon energy of the third step laser is fixed as 20250cm -1 (wavelength is 493.7 nm), barium atoms in many 6sns states can be detected with the highest detection efficiency, where n=10-20.

[0043] It is worth pointing out that generally the self-ionized state has a larger width, which increases with decreasing n. Therefore, when detecting Rydberg atoms, only the wavelength of the excitation light in the third step needs to be fixed near the above wavelength, so that all atoms in the 6snl state can obtain a better detection effect, thus overcoming the conventional direct photoionization. In the detection method, the detection efficiency is highly sensitive to the laser wavelength. In conclusion, the present invention is both efficient and easy to use.

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Abstract

This invention disclosed a high efficiency detection method for alkaline earth ions. Three dye laser wares were activated by a Nd:YAG laser ware, alkaline earth atomic beam was illuminated by two dye laser wares to produce atom samples with different n, l value; ionizate the atom by the third dye laser wares. This invention has high efficiency no matter whether the n value of Rydberg atom was high. It improved the bug of traditional method and could be applied to every kind of alkaline earth atom.

Description

【Technical field】: [0001] The patent of the present invention relates to a detection technology, especially a high-efficiency detection method of alkaline earth metal atoms. 【technical background】: [0002] With the continuous application of laser spectroscopy in photochemistry, isotope separation, atmospheric monitoring and other fields, it is necessary to detect atoms and molecules in a highly excited state, and higher and higher requirements for detection resolution and sensitivity are put forward. Traditional detection methods (such as absorption spectroscopy, resonant fluorescence spectroscopy, photoacoustic spectroscopy, photocurrent spectroscopy, and electric field ionization spectroscopy) cannot meet the needs of high excited state research due to the constraints of detection efficiency and resolution. For the detection of some atoms and molecules in the low excited state, the more effective way is to use the fluorescence detection method to collect the radiated phot...

Claims

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Application Information

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IPC IPC(8): G01N21/63
Inventor 戴长建
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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