Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
J Phys Chem A. 2010 Apr 15;114(14):4870-4. doi: 10.1021/jp9104097.
We report on our recent studies of dissociative recombination (DR) employing two different fragment imaging detection techniques at the TSR storage ring in Heidelberg, Germany. Principles of an upgraded 3D optical system and the new energy-sensitive multistrip detector (EMU) are explained together with possible applications in reaction dynamics studies. With the EMU imaging detector we succeeded to observe the branching ratios after DR of deuterated hydronium ions D(3)O(+) at energies of 0-0.5 and 4-21 eV. The branching ratios are almost constant at low energies while above 6 eV both oxygen-producing channels O + D + D + D and O + D(2) + D strongly increase and dominate by about 85% at 11 eV. To demonstrate further capabilities of our fragment imaging detectors, we also summarize some of our additional recent studies on DR of molecular ions important for astrophysics as well as for fundamental unimolecular dynamics.
我们报告了最近在德国海德堡 TSR 储存环上使用两种不同的碎片成像检测技术进行的离解复合（DR）研究。本文介绍了升级后的 3D 光学系统和新型能量敏感多丝探测器（EMU）的原理，并讨论了它们在反应动力学研究中的可能应用。使用 EMU 成像探测器，我们成功地观察了氘化水合氢离子 D(3)O(+)在 0-0.5 和 4-21 eV 能量下的 DR 后分支比。在低能下，分支比几乎保持不变，而在 6 eV 以上，两种产生氧的通道 O + D + D + D 和 O + D(2) + D 强烈增加，并在 11 eV 时主导约 85%。为了进一步展示我们的碎片成像探测器的能力，我们还总结了一些关于对天体物理学以及基本单分子动力学很重要的分子离子的 DR 的最新研究。
