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arXiv 1107.3092physics.atom-ph
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铷原子D1线上的绝对吸收:包括共振偶极-偶极相互作用

Absolute absorption on rubidium D1 line: including resonant dipole-dipole interactions

Lee Weller, Robert J Bettles, Paul Siddons, Charles S Adams, Ifan G Hughes

摘要:

在此,我们报告了在弱探测区中,温度高达170 ℃,数密度高达3 \times 10 ^14 cm^-3的稠密铷蒸气在D1线上的绝对吸收光谱的测量结果。在这样的蒸气中,由于相同原子之间的偶极-偶极相互作用,在基态和激发态的叠加中,光学跃迁的均匀线宽发生了变化。绝对吸收光谱记录与实验和理论之间的偏差为0.1%,将共振偶极-偶极相互作用。偶极-偶极相互作用的表现是对均匀线宽的自加宽贡献,其随原子数密度线性增长。对绝对吸收光谱的分析使我们能够确定铷D1线的自增宽系数值:β/2π=(0.69 \pm 0.04)\times 10^-7 Hz cm ^3,与理论预测非常吻合。

英文摘要:

Here we report on measurements of the absolute absorption spectra of dense rubidium vapour on the D1 line in the weak-probe regime for temperatures up to 170 C and number densities up to 3 \times 10^14 cm^-3. In such vapours, modifications to the homogeneous linewidth of optical transitions arise due to dipole-dipole interactions between identical atoms, in superpositions of the ground and excited states. Absolute absorption spectra were recorded with deviation of 0.1% between experiment and a theory incorporating resonant dipole-dipole interactions. The manifestation of dipole-dipole interactions is a self-broadening contribution to the homogeneous linewidth, which grows linearly with number density of atoms. Analysis of the absolute absorption spectra allow us to ascertain the value of the self-broadening coefficient for the rubidium D1 line: β/2π= (0.69 \pm 0.04) \times 10^-7 Hz cm^3, in excellent agreement with the theoretical prediction.

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