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用于α和μ常数变化测量的碘离子光谱研究
Spectra of I+2 for possible measurement of α and μ constant
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摘要: 分子离子I+2的禁戒跃迁光谱有可能用于测量 α 和 μ 常数的变化,并且具有增强的灵敏度.通过分析I+2在11860—13100 cm-1范围内的转动光谱,拟合了A2Π3/2-X2Π3/2系统31个振转带的5759根吸收谱线,得到5个属于X2Π3/2态和9个属于A2Π3/2态的振动能级准确的转动光谱常数.在量子噪声极限和1 Hz跃迁线宽的条件下,计算得到X2Π3/2和X2Π1/2之间的禁戒跃迁对 α 和 μ 常数变化测量的灵敏度为δα/α ≈2.37×10-19 a-1和 δμ/μ ≈1.18×10-18 a-1.Abstract: The forbidden transitions of I+2 may be used to measure the variations of α and μ constant in an enhanced sensitivity. We analyze the rotational spectrum of I+2 between 11860 and 13100 cm-1 and assign 5759 lines to 31 bands in an A2Π3/2-X2Π3/2 system. The accurate rotational molecular constants of 5 levels in X2Π3/2 state and 9 levels in A2Π3/2 state are obtained. On condition that the signal-to-noise ratio is limited by quantum projection noise and the linewidth is 1 Hz, the forbidden transition between X2Π3/2 and X2Π1/2 should be able to achieve the sensitivities of δα/α ≈ 2.37 × 10-19 a-1 and δμ/μ ≈ 1.18 × 10-18 a-1 .
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