title: Emission of highly excited electronic states of potassium from cryptomelane nanorods.
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.
authors.affiliation: Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland. kotarba@chemia.uj.edu.pl.
authors.forename: P
authors.initials: P
authors.lastname: Stelmachowski
authors.forename: P
authors.initials: P
authors.lastname: Legutko
authors.forename: T
authors.initials: T
authors.lastname: Jakubek
authors.forename: P
authors.initials: P
authors.lastname: Indyka
authors.forename: Z
authors.initials: Z
authors.lastname: Sojka
authors.forename: L
authors.initials: L
authors.lastname: Holmlid
authors.forename: A
authors.initials: A
authors.lastname: Kotarba