The electron affinity of the deuterium atom has been determined to be 6086.81(27) cm⁻¹ from a measurement of the difference between the D⁺ + H⁻ and H⁺ + D⁻ ion-pair dissociation energies and a thermochemical cycle involving the electron affinity of H and the ionization energies of H and D. Heavy-Rydberg states and the ion-pair dissociation thresholds of HD were accessed with good efficiency using a three-photon excitation sequence through the B ${}^1\mathrm{\Sigma }_u^{+}$ ($v$ = 22, N = 1) and $\overline{\mathrm{H}}{}^1\mathrm{\Sigma }_g^{+}$ ($v$ = 9, N = 0) intermediate levels and the threshold positions were determined using the method of threshold-ion-pair-production spectroscopy.

中文翻译：

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通讯：HD的重里德堡状态和氘原子的电子亲和力

氘原子的电子亲和力已被确定为6086.81（27）厘米^-1从d之间的差的测量⁺ + H ^-和H ⁺ + d ^-离子对离解能和热化学循环中涉及的电子H的亲和力以及H和D的电离能。通过B的三光子激发序列，可以高效访问HD的重里德堡态和离子对解离阈值${}^{\mathrm{1个}}\mathrm{\Sigma }_{ü}^{+}$ （$v$= 22，N = 1），$\overline{\mathrm{H}}{}^{\mathrm{1个}}\mathrm{\Sigma }_G^{+}$ （$v$= 9，N = 0）使用阈值离子对产生光谱法确定中间水平和阈值位置。