冷铯二聚体激发态的光电离光谱
Photoionization spectroscopy of excited states of cold cesium dimers
摘要：
本文报道了在磁光阱中由冷原子光缔合得到的冷铯二聚体的光电离光谱。特别是，我们报告了对所有激发态的观测和光谱分析，这些激发态实际上已被用于有效地探测稳定在三重态a^3 Sigma_u ^+基态的冷分子。它们是：（1）^3 Sigma_g ^+状态连接到6s+6p渐近线，（2）^3 Sigma_g ^+和（2）^3 Pi_g状态连接到6s+5d渐近线，最后（3）^3 Sigma_g ^+状态连接到6s + 7s渐近线。通过这些状态的检测跨越了宽范围的激光能量，从8000到16500 cm-1，获得不同的激光染料和技术。还提供了关于冷分子在a^3 Sigma_u ^+基态的不同振动能级之间的初始分布的信息。这种光谱知识在构思量子操纵、粒子数转移和冷铯分子的光学探测方案时非常重要。
英文摘要：
Photoionization spectroscopy of cold cesium dimers obtained by photoassociation of cold atoms in a magneto-optical trap is reported here. In particular, we report on the observation and on the spectroscopic analysis of all the excited states that have actually been used for efficient detection of cold molecules stabilized in the triplet a^3Sigma_u^+ ground state. They are: the (1)^3Sigma_g^+ state connected to the 6s+6p asymptote, the (2)^3Sigma_g^+ and (2)^3Pi_g states connected to the 6s+5d asymptote and finally the (3)^3Sigma_g^+ state connected to the 6s + 7s asymptote. The detection through these states spans a wide range of laser energies, from 8000 to 16500 cm-1, obtained with different laser dyes and techniques. Information on the initial distribution of cold molecules among the different vibrational levels of the a^3Sigma_u^+ ground state is also provided. This spectroscopic knowledge is important when conceiving schemes for quantum manipulation, population transfer and optical detection of cold cesium molecules.
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