论文标题
低 - $ j $ trielde {a}^2π（0,0,0） - \ tilde {x}^2σ^+（0,0,0）
Low-$J$ transitions in $\tilde{A}^2Π(0,0,0)-\tilde{X}^2Σ^+(0,0,0)$ band of buffer-gas-cooled CaOH
论文作者
论文摘要
钙一羟基自由基（CAOH）正在从天体物理学群落中受到越来越多的关注，因为预计在热岩石的超级冰球外球星的大气以及星际环境和情节环境中会存在。在这里，我们报告了$ \ tilde {a}^2π（0,0,0,0） - \ tilde {x}^2σ^+（0,0,0,0）$ buffer-gas-gas-cool caoh的$ \ tilde {a}^2π（0,0,0,0）的高分辨率实验室吸收光谱。总共分配了低$ J $州中的40个过渡，其中包括27种过渡，这些过渡尚未在以前的文献中报告。地面和激发态的确定的旋转常数与以前的文献非常吻合，并且对绝对过渡频率的测量不确定性提高了超过三倍。这将有助于未来的星际，情节和大气的鉴定。这里采用的缓冲液 - 冷却方法是一种特别有力的方法，可探测低$ J $过渡，并且很容易适用于其他天体物理分子。
Calcium monohydroxide radical (CaOH) is receiving an increasing amount of attention from the astrophysics community as it is expected to be present in the atmospheres of hot rocky super-Earth exoplanets as well as interstellar and circumstellar environments. Here, we report the high-resolution laboratory absorption spectroscopy on low-$J$ transitions in $\tilde{A}^2Π(0,0,0)-\tilde{X}^2Σ^+(0,0,0)$ band of buffer-gas-cooled CaOH. In total, 40 transitions out of the low-$J$ states were assigned, including 27 transitions which have not been reported in previous literature. The determined rotational constants for both ground and excited states are in excellent agreement with previous literature, and the measurement uncertainty for the absolute transition frequencies was improved by more than a factor of three. This will aid future interstellar, circumstellar, and atmospheric identifications of CaOH. The buffer-gas-cooling method employed here is a particularly powerful method to probe low-$J$ transitions and is easily applicable to other astrophysical molecules.
