Known for their stable structural and thermal properties, diamondoids and particularly their radical cations are viable candidates as carriers for diffuse interstellar bands. While previous research has mainly focused on neutral diamondoids and their derivatives, little is known about their radical cations, which may form in interstellar environments by ionizing radiation. We report the first experimental optical spectrum of the simplest diamondoid cation, the adamantane radical cation ( ##IMG## [http://ej.iop.org/images/2041-8205/900/2/L20/apjlabafbdieqn1.gif] {${{\rm{C}}}_{10}{{{\rm{H}}}_{16}}^{+}$} ), obtained via electronic photodissociation spectroscopy of cryogenic ions in the 310–1000 nm range. The main fragmentation channels are H loss at low energies and C 3 H 7 loss at higher energies. The optical spectrum reveals a broad band spanning the range of 420–850 nm, assigned to the D 2 ( 2 E) ← D ...

中文翻译：

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金刚烷自由基阳离子的光谱

类金刚石，尤其是其自由基阳离子以其稳定的结构和热性能而闻名，是弥散星际带的载体的可行候选者。尽管先前的研究主要集中于中性类金刚石及其衍生物，但对它们的自由基阳离子知之甚少，而自由基阳离子可能在星际环境中通过电离辐射形成。我们报告了最简单的类金刚石阳离子，金刚烷自由基阳离子（## IMG ## [http://ej.iop.org/images/2041-8205/900/2/L20/apjlabafbdieqn1.gif] {$ {{\ rm {C}}} _ {10} {{\ rm {H}}} _ {16}} ^ {+} $}），是通过电子光解光谱法对310- 1000 nm范围。主要的碎片通道是低能时的H损失和高能时的C 3 H 7损失。