Cyanoacetylene, the simplest cyanopolyyne, is an abundant interstellar molecule commonly observed in a vast variety of astronomical sources. Despite its importance as a potential tracer of the evolution of star-forming processes, the deuterated form of cyanoacetylene is less observed and less studied in the laboratory than the main isotopologue. Here, we report the most extensive spectroscopic characterization of DC₃N to date, from the millimeter domain to the infrared region. Rotational and ro-vibrational spectra have been recorded using millimeter-wave frequency-modulation and Fourier-transform infrared spectrometers, respectively. All the vibrational states with energy up to 1015 cm${}^{-1}$ have been analyzed in a combined fit, where the effects due to anharmonic resonances have been adequately accounted for. The analysis contains over 6500 distinct transition frequencies, from which all the vibrational energies have been determined with good precision for many fundamental, overtone, and combination states. This work provides a comprehensive line catalog for astronomical observations of DC₃N.

氰基乙炔是最简单的氰基多炔，是一种丰富的星际分子，通常在各种各样的天文来源中都可以观察到。尽管它作为恒星形成过程的潜在示踪剂的重要性，但氘化形式的氰基乙炔在实验室中的观察和研究要少于主要的同位素异构体。在这里，我们报道了从毫米波域到红外区域，迄今为止DC ₃ N的最广泛的光谱表征。分别使用毫米波频率调制和傅立叶变换红外光谱仪记录了旋转和旋转振动光谱。能量高达1015厘米的所有振动状态${}^{-\mathrm{1个}}$结合进行了综合分析，其中充分考虑了非谐共振的影响。该分析包含6500多个不同的跃迁频率，从中可以很好地确定所有基本，泛音和组合状态的所有振动能。这项工作为DC ₃ N的天文观测提供了全面的线路目录。