Structure and properties of the radiation-induced intermediates produced from HCN in noble gas matricesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 28 июня 2016 г.
Аннотация:In this work we report the results of systematic studies on the radiation-induced
transformations in HCN/Ng systems (Ng = Ne, Ar, Kr or Xe) at 7 K using a combination of
FTIR and EPR spectroscopy. It was shown that HCN underwent efficient decomposition
producing H atoms, CN radicals and HNC isomer. The thermally induced reactions of H atoms
in different matrices result in the formation of two isomeric radicals, H2CN and trans-HCNH, the
former being predominated. The temperature dependent dynamics of CN and H2CN radicals in a
krypton matrix was observed by EPR spectroscopy in solid krypton. The vibrational frequencies,
IR intensities and magnetic resonance parameters of H2CN and trans-HCNH radicals calculated
at the CCSD(T) level are in reasonable agreement with the experimental results. It was found
that HCNH radical could be effectively bleached with visible light. The comparison of
experimental and computational data made it possible to assign a new vibrational band at 918
cm-1 in an Ar matrix (and the corresponding bands in Kr and Xe) to trans-HCNH radical. In
addition, HKrCN was found in the case of krypton, whereas HXeCN and HXeNC were produced
in solid xenon. The reaction mechanisms and contribution of different channels are discussed.