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Issue 2, 2014
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Photodetachment and photodissociation of the linear OCuO molecular anion: energy and time dependence of Cu production

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Abstract

A photodissociative study of CuO2 is presented using a combination of energy and time domain photoelectron spectroscopy. Ion source conditions are used that solely produce linear OCuO. Photodissociation of this isomer to produce Cu + O2 is conclusively demonstrated at wavelengths between 765 and 340 nm. Nanosecond pulsed photoexcitation at wavelengths shorter than 340 nm produces single photon detachment transitions from the first excited state of CuO2. At longer wavelengths narrow Cu fragment transitions are observed as a result of a sequential two photon process. In addition, the longer wavelengths produce a weak, broad two photon dependent signal, the result of detachment of the dissociating linear isomer. Time resolved pump–probe measurements reveal a long timescale growth (up to 150 ps) of the Cu fragment yield, consistent with the unfavorable starting geometry for the dissociative process and indicating a potential energy surface which has one or more substantial barriers to dissociation.

Graphical abstract: Photodetachment and photodissociation of the linear OCuO− molecular anion: energy and time dependence of Cu− production

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Publication details

The article was received on 16 Jul 2013, accepted on 27 Sep 2013 and first published on 02 Oct 2013


Article type: Paper
DOI: 10.1039/C3CP52986J
Phys. Chem. Chem. Phys., 2014,16, 497-504

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    Photodetachment and photodissociation of the linear OCuO molecular anion: energy and time dependence of Cu production

    R. Mabbs, N. Holtgrewe, D. B. Dao and J. Lasinski, Phys. Chem. Chem. Phys., 2014, 16, 497
    DOI: 10.1039/C3CP52986J

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