振动激励CO的精确实验室静止频率高达$varv = 3$和高达2 THz
Accurate laboratory rest frequencies of vibrationally excited CO up to $varv = 3$ and up to 2 THz
摘要：
对宇宙中第二丰富的分子CO的（亚）毫米波长纯旋转发射线进行天文观测，有望探测星周包层最内部的高温和高密度区域。在实验室中测量了220 ~ 1940 GHz的振动激发CO的转动谱，其相对精度可达$\varv = 3$，相当于1 THz附近的$\sim 5$ kHz。旋转常数$B$和四次畸变参数$D$已被确定具有高精度，甚至六次畸变项$H$被确定得相当好的$\varv = 1$，而合理的估计$H$得到$\varv = 2$和3。本数据集允许预测振动激发CO的精确静止频率远远超过2太赫兹。
英文摘要：
Astronomical observations of (sub)millimeter wavelength pure rotational emission lines of the second most abundant molecule in the Universe, CO, hold the promise of probing regions of high temperature and density in the innermost parts of circumstellar envelopes. The rotational spectrum of vibrationally excited CO up to $\varv = 3$ has been measured in the laboratory between 220 and 1940 GHz with relative accuracies up to $5.2 \times 10^{-9}$, corresponding to $\sim 5$ kHz near 1 THz. The rotational constant $B$ and the quartic distortion parameter $D$ have been determined with high accuracy and even the sextic distortion term $H$ was determined quite well for $\varv = 1$ while reasonable estimates of $H$ were obtained for $\varv = 2$ and 3. The present data set allows for the prediction of accurate rest frequencies of vibrationally excited CO well beyond 2 THz.
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