论文标题
氦纳米光的分子的旋转相干光谱：核对时间和频域
Rotational coherence spectroscopy of molecules in helium nanodroplets: Reconciling the time and the frequency domains
论文作者
论文摘要
OCS的比对，CS $ _2 $和I $ _2 $分子嵌入氦纳米光中的分子是通过非谐波激发后的时间函数测量的，这是非谐波激发，相对较弱的PS激光脉冲。通过傅立叶分析获得的功率光谱中的不同峰用于确定旋转，B和离心畸变，D，d，常数。对于OCS，B和D与IR光谱已知的值匹配。对于CS $ _2 $和I $ _2 $，它们是报告的第一个实验结果。使用实验内的B和D值根据气相旋转schrödinger方程计算得出的比对动力学与所有三个分子的测量详细一致。此处引入的氦液滴中分子的旋转光谱技术应适用于一系列分子和复合物。
Alignment of OCS, CS$_2$ and I$_2$ molecules embedded in helium nanodroplets is measured as a function of time following rotational excitation by a non-resonant, comparatively weak ps laser pulse. The distinct peaks in the power spectra, obtained by Fourier analysis, are used to determine the rotational, B, and centrifugal distortion, D, constants. For OCS, B and D match the values known from IR spectroscopy. For CS$_2$ and I$_2$, they are the first experimental results reported. The alignment dynamics calculated from the gas-phase rotational Schrödinger equation, using the experimental in-droplet B and D values, agree in detail with the measurement for all three molecules. The rotational spectroscopy technique for molecules in helium droplets introduced here should apply to a range of molecules and complexes.
