论文标题
来自振动饱和光谱的高清旋转水平间距
Rotational level spacings in HD from vibrational saturation spectroscopy
论文作者
论文摘要
使用NICE-OHMS光谱技术测量HD分子（2-0）泛音带中的R（1），R（3）和P（3）RO振动过渡。对于迄今未在饱和度中观察到的P（3）行，我们报告了$ 203 \，821 \，936 \，805 \，（60）$ kHz的频率。在三个光谱中观察到的分散线形状显示出很强的相关性，从而可以提取有关旋转水平间距的准确信息。这导致$δ_{（j = 3） - （j = 1）} = 13 \，283 \，245 \，098 \，（30）$ kHz的级别间距为$ v = 0 $ theng，$δ__{（j = 4） - （j = 2）} = 16} = 16 = 16 \，3682 \，3682 \，3682 \，y，3682 \， $ v = 2 $ HD激发振动。这些结果表明，旋转间距的实验值始终大于以1.5 $σ$的高级缩写理论计算获得的实验值，其中不确定性是由理论决定的。对于振动过渡，对于在（2-0）频段中精确测量的五个线的系统偏差始终如一，振动转换也是如此。
The R(1), R(3) and P(3) ro-vibrational transitions in the (2-0) overtone band of the HD molecule are measured in Doppler-free saturation using the technique of NICE-OHMS spectroscopy. For the P(3) line, hitherto not observed in saturation, we report a frequency of $203\,821\,936\,805\,(60)$ kHz. The dispersive line shapes observed in the three spectra show strong correlations, allowing for extraction of accurate information on rotational level spacings. This leads to level spacings of $Δ_{(J=3)-(J=1)}= 13\,283\,245\,098\,(30)$ kHz in the $v=0$ ground state, and $Δ_{(J=4)-(J=2)}= 16\,882\,368\,179\,(20)$ kHz in the $v=2$ excited vibration in HD. These results show that experimental values for the rotational spacings are consistently larger than those obtained with advanced ab initio theoretical calculations at 1.5$σ$, where the uncertainty is determined by theory. The same holds for the vibrational transitions where systematic deviations of 1.7-1.9$σ$ are consistently found for the five lines accurately measured in the (2-0) band.
