The angular distribution of the anions formed in the dissociative electron attachment (DEA) to ${\mathrm{H}}_2, {\mathrm{D}}_2$, and HD is studied for the 10-eV resonance using the velocity slice imaging technique. The angular distributions of ${\mathrm{H}}^{-}$ and ${\mathrm{D}}^{-}$ from HD are found to be identical and very similar to that of ${\mathrm{H}}^{-}$ (${\mathrm{D}}^{-}$) from ${\mathrm{H}}_2$ (${\mathrm{D}}_2$) indicating that the distinct dissociation limits for ${\mathrm{H}}^{-}$ and ${\mathrm{D}}^{-}$ channels and the small but finite dipole moment of HD do not affect the DEA process. The angular distributions suggest that the main contribution for this resonance is from the capture of $s$ and $d$ partial waves of the attaching electron confirming the resonance to be a ${}^2{{\mathrm{\Sigma }}_g}^{+}$ state. The relative amplitudes of the two partial waves as a function of electron energy also indicate the contribution from a higher-lying ${}^2{{\mathrm{\Sigma }}_g}^{+}$ state through possible predissociation at higher electron energies.

中文翻译：

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10 eV 下 H2、D2 和 HD 中负离子共振的结构和动力学

在离解电子附着 (DEA) 中形成的阴离子的角分布 ${\mathrm{H}}_2, {\mathrm{D}}_2$，并使用速度切片成像技术研究了 10 eV 共振的 HD。的角分布${\mathrm{H}}^{-}$ 和 ${\mathrm{D}}^{-}$ 从 HD 被发现是相同的和非常相似的 ${\mathrm{H}}^{-}$ (${\mathrm{D}}^{-}$） 从 ${\mathrm{H}}_2$ (${\mathrm{D}}_2$) 表明不同的解离极限 ${\mathrm{H}}^{-}$ 和 ${\mathrm{D}}^{-}$通道和 HD 的小但有限的偶极矩不影响 DEA 过程。角分布表明，这种共振的主要贡献来自捕获$秒$ 和 $d$ 附着电子的部分波确认共振是 ${}^2{{\mathrm{\Sigma }}_G}^{+}$状态。作为电子能量函数的两个部分波的相对振幅也表明来自较高位置的贡献${}^2{{\mathrm{\Sigma }}_G}^{+}$ 通过在较高电子能量下可能的预解离状态。