Emission of highly excited electronic states of potassium from cryptomelane nanorods

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 ioniza...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2015-01, Vol.17 (39), p.26289-26294
Main Authors: Stelmachowski, P, Legutko, P, Jakubek, T, Indyka, P, Sojka, Z, Holmlid, L, Kotarba, A
Format: Article
Language:English
Subjects:
ammonia-synthesis catalyst
Atomic beam spectroscopy
Chemistry
Detectors
Electron states
Emission
field
Fysikalisk kemi
k beam
manganese oxide
Nanorods
oms-2
oxidation
Physical Chemistry
Physics
Potassium
reversal
rydberg matter
scattering
stability
Surface ionization
surfaces
Synthesis (chemistry)
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Summary: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.
ISSN:1463-9076
1463-9084
DOI:10.1039/c5cp04108b