基于^(199)Hg^+离子囚禁的四极线型离子阱径向囚禁势的研究（英文）

Radial confinement potential of quadrupole linear ion trap based on trapped ^(199)Hg^+ ions

在汞离子(^(199)Hg^+)微波频标中,通过四极线型离子阱囚禁汞离子(^(199)Hg^+)获得超精细跃迁光谱。汞离子的囚禁与频标稳定度紧密相关。在满足Mathieu方程稳定性条件的情况下,研究了该频标径向囚禁势对阱中囚禁汞离子(^(199)Hg^+)数的影响。经扫频,其影响表现在荧光强度、谱线宽度和中心频率三个方面的变化上.随着径向囚禁势的增加,荧光的强度增大,谱线宽变窄,中心频率向左偏移.由此,设计了小型化射频源,以确保离子的稳定囚禁。经测试,小型化射频源幅度的标准差稳定度为0.51 V。其体积仅0.1 L,功耗约3.5 W,能满足小型化汞离子微波频标制备要求。

To obtain the hyperfine transition spectrum of microwave 199 Hg+ ion frequency standard there must be trapped 199Hg+ ions. 199Hg+ ion confinement is closely related to the stability of this frequency standard.The influence of radial confinement potential on the trapped 199Hg+ ion number in quadrupole linear ion trap was studied through experiments according to the stability condition of Mathieu equation. It is found that the influence is reflected in three aspects by spectrum scanning: fluorescence intensity, spectrum width and center frequency. As the radial confinement potential increases, the intensity of fluorescence becomes larger,the spectrum width becomes narrower, and the center frequency becomes smaller. Then, a miniaturized radio frequency(RF) source was designed based on the experiment. This RF source can provide the required radial confinement potential to guarantee the stability of the trapped 199 Hg+ ion. The Amplitude stability of the RF source is 0.51 V expressed by standard deviation( SD). The RF source volume of is only 0.1 L and the power consumption is about 3.5 W, which can meet the requirement of the frequency standards miniaturization.