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Issue 39, 2015
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Emission of highly excited electronic states of potassium from cryptomelane nanorods

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Abstract

Cryptomelane (KMn8O16) nanorods were synthesized, characterized (XRD, Raman spectroscopy, TEM/SAED) and investigated by species resolved thermal desorption of potassium from the material in the range of 20–620 °C. The desorbing fluxes of ions, atoms and highly excited electronic states (field ionizable Rydberg states) were measured using an ion collector, surface ionization and field ionization detectors, respectively, in a vacuum apparatus. The non-equilibrium emission of potassium Rydberg species (principal quantum number > 30) strongly depends on the surface positive voltage bias with a broad maximum at 1–8 V. The stimulation of Rydberg species emission is discussed in terms of spatial and energetic overlapping between the electron cloud above the cryptomelane surface and the desorbing potassium ion.

Graphical abstract: Emission of highly excited electronic states of potassium from cryptomelane nanorods

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Publication details

The article was received on 15 Jul 2015, accepted on 01 Sep 2015 and first published on 01 Sep 2015


Article type: Paper
DOI: 10.1039/C5CP04108B
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Citation: Phys. Chem. Chem. Phys., 2015,17, 26289-26294

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    Emission of highly excited electronic states of potassium from cryptomelane nanorods

    P. Stelmachowski, P. Legutko, T. Jakubek, P. Indyka, Z. Sojka, L. Holmlid and A. Kotarba, Phys. Chem. Chem. Phys., 2015, 17, 26289
    DOI: 10.1039/C5CP04108B

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