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Issue 31, 2012
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New results for the formation of a muoniated radical in the Mu + Br2 system: a van der Waals complex or evidence for vibrational bonding in Br–Mu–Br?

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Abstract

New evidence is presented for the observation of a muoniated radical in the Mu + Br2 system, from μSR longitudinal field (LF) repolarisation studies in the gas phase, at Br2 concentrations of 0.1 bar in a Br2/N2 mixture at 300 K and at 10 bar total pressure. The LF repolarisation curve, up to a field of 4.5 kG, reveals two paramagnetic components, one for the Mu atom, formed promptly during the slowing-down process of the positive muon, with a known Mu hyperfine coupling constant (hfcc) of 4463 MHz, and one for a muoniated radical formed by fast Mu addition. From model fits to the Br2/N2 data, the radical component is found to have an unusually high muon hfcc, assessed to be ∼3300 MHz with an overall error due to systematics expected to exceed 10%. This high muon hfcc is taken as evidence for the observation of either the Br–Mu–Br radical, and hence of vibrational bonding in this [H with combining low line][L with combining low line][H with combining low line] system, or of a Mu⋯Br2 van der Waals complex formed in the entrance channel. Preliminary ab initio electronic structure calculations suggest the latter is more likely but fully rigorous calculations of the effect of dynamics on the hfcc for either system have yet to be carried out.

Graphical abstract: New results for the formation of a muoniated radical in the Mu + Br2 system: a van der Waals complex or evidence for vibrational bonding in Br–Mu–Br?

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Publication details

The article was received on 10 Feb 2012, accepted on 21 Jun 2012 and first published on 21 Jun 2012


Article type: Paper
DOI: 10.1039/C2CP41366C
Citation: Phys. Chem. Chem. Phys., 2012,14, 10953-10966
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    New results for the formation of a muoniated radical in the Mu + Br2 system: a van der Waals complex or evidence for vibrational bonding in Br–Mu–Br?

    D. G. Fleming, S. P. Cottrell, I. McKenzie and R. M. Macrae, Phys. Chem. Chem. Phys., 2012, 14, 10953
    DOI: 10.1039/C2CP41366C

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