Corroboration of Theory for H + D2 → D + HD (v′ = 3, j′ = 0) Reactive Scattering Dynamics

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• 作者：Noah T. Goldberg ; Jianyang Zhang ; Daniel J. Miller ; Richard N. Zare
• 刊名：Journal of Physical Chemistry A
• 出版年：2008
• 出版时间：October 2, 2008
• 年：2008
• 卷：112
• 期：39
• 页码：9266-9268
• 全文大小：170K
• 年卷期：v.112,no.39(October 2, 2008)
• ISSN：1520-5215

文摘

The differential cross section (DCS) for the reaction H + D₂ → D + HD (v′ = 3, j′ = 0) exhibits particularly rich dynamics; in addition to the expected direct recoil backscattering feature, a surprising time-delayed forward scattering feature appears that has been attributed to glory scattering arising from nearside and farside interference. This fact leads to a complex DCS that depends strongly on the collision energy. Its accurate calculation requires a fully quantum mechanical (QM) treatment. We report improved measurements of this DCS over the collision energy range 1.55 ≤ E_coll ≤ 1.82 eV. Previous measurements using the core extraction method, while generally in agreement with theory, lacked sufficient resolution to capture all of the noteworthy behavior of the system; in the present work, we use ion imaging to observe many previously unresolved features of the DCS, particularly in the forward-scattered region. Agreement with QM calculations is found at all collision energies, reconciling an earlier discrepancy between experiment and theory near E_coll = 1.54 eV.