傅里叶变换光谱研究LiCs的X $^1Σ^+$和a $^3Σ^+$态
The X$^1Σ^+$ and a$^3Σ^+$ states of LiCs studied by Fourier-transform spectroscopy
摘要：
我们提出了第一个高分辨率的光谱研究LiCs。LiCs在热管炉中形成，并通过激光诱导荧光傅里叶变换光谱进行研究。通过X $^1Σ^+$ -B $^1Π$和X $^1Σ^+$ -D $^1Π$跃迁激发分子，已经观察到X $^1Σ^+$基态的振动能级低于离解极限高达3 cm ^{-1}，从而能够精确构建电势。此外，由于激发态在相应的激发原子渐近线处获得了足够的三重态特征，因此在a $^3Σ^+$三重态基态中观察到了振转能级。借助于耦合通道计算，得到了精确的单重态和三重态基态势，达到原子的基态渐近线，并首次预言了Li + Cs对的冷碰撞性质。
英文摘要：
We present the first high-resolution spectroscopic study of LiCs. LiCs is formed in a heat pipe oven and studied via laser-induced fluorescence Fourier-transform spectroscopy. By exciting molecules through the X$^1Σ^+$-B$^1Π$ and X$^1Σ^+$-D$^1Π$ transitions vibrational levels of the X$^1Σ^+$ ground state have been observed up to 3cm^{-1} below the dissociation limit enabling an accurate construction of the potential. Furthermore, rovibrational levels in the a$^3Σ^+$ triplet ground state have been observed because the excited states obtain sufficient triplet character at the corresponding excited atomic asymptote. With the help of coupled channels calculations accurate singlet and triplet ground state potentials were derived reaching the atomic ground state asymptote and allowing first predictions of cold collision properties of Li + Cs pairs.
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