Alkaline earth metal atom effective detecting method
A technology of alkaline earth metal and detection method, which is applied in the field of detection, can solve the problems of low efficiency, difficult operation, narrow adaptability, etc., and achieve the effect of high detection efficiency
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[0022] Preparation of highly excited atomic samples in the present invention: it is necessary to accurately control the temperature of the heating crucible, and the metal with high purity (more than 99.5%) is placed in a high vacuum (vacuum degree is 10 -4 Pa) in an environment heated to 580-630 degrees Celsius, 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 highly collimated (parallelism between 8-12 degrees) atomic beam. 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; perpendicular to the beam direction. Controlling the orthogonality between the atomic beam and the three laser beams is to basically eliminate the Doppler broadening effect and ensure high-resolution detection of highly excited...
example 1
[0039] Example 1: Detection of barium atoms in the 6s17d state.
[0040] figure 1 The barium atom 6p measured in the present invention is given 1 / 2 The spectrum of the 17d self-ionization state. Depend on figure 1 It can be seen that the resonance peak of this self-ionization state is located near the wavelength of 493.7 nm. Therefore, when detecting atoms in the 6snd highly excited state, the highest detection efficiency can be obtained only by fixing the wavelength of the third-step laser at around 493.7nm.
example 2
[0041] Example 2: Probing barium atoms in multiple 6sns states.
[0042] figure 2 Given the multiple 6p measured by the present invention 1 / 2 ns Spectra of the self-ionized state, where n = 10-20. Therefore, as long as the photon energy of the third step laser is fixed at 20250cm -1 (the wavelength is 493.7nm), the 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 autoionized state has a large width and increases with the decrease of n. Therefore, when detecting Rydberg atoms, all the atoms in the 6snl state can obtain better detection results by fixing the wavelength of the excitation light in the third step near the above wavelength, thus overcoming the conventional direct photoionization method. In the detection mode, 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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