Volume 32, Issue 3, March 2006
Index of content:
- LOW-DIMENSIONAL AND DISORDERED SYSTEMS
32(2006); http://dx.doi.org/10.1063/1.2178481View Description Hide Description
The problem of plasma waves in a thick wire in the presence of a magnetic field perpendicular to the wire is considered in the random phase approximation. The standard model of a wire, with a parabolic confinement potential, is used. The polarization operator of a degenerate and a nondegenerate electron gas in the wire is calculated for an arbitrary width of that potential. Formulas are obtained for the spectrum and damping of intrasubband and intersubband magnetoplasmons in wires with a degenerate and nondegenerate electron gas for an arbitrary number of filled confinement subbands. The anisotropy of the magnetoplasmon spectrum in a thick wire and the screening of the Coulomb field of an electric charge in the wire are considered.
Heterogeneous cluster formation in a supersonic argon-krypton jet according to cathodoluminescence data in the vacuum ultraviolet32(2006); http://dx.doi.org/10.1063/1.2178482View Description Hide Description
Processes of cluster formation in a supersonic argon-krypton jet at low concentrations of the krypton impurity (down to ) are investigated by a luminescence method. VUV diagnostics of the picture of heterogeneous nucleation, including its earliest stages, is employed for the first time. Attention is focused mainly on the behavior of the emission bands belonging to the neutral excimers and and the charged homoatomic complexes and and the heteroatomic exciplexes . In the first stage of heterogeneous nucleation the nuclei can be krypton atoms (dimers). Beginning at krypton concentrations in the gas mixture of 0.02% and higher a multiatomic krypton core is formed in the cluster. When such clusters are ionized the ion is located in the krypton core, and its electric field has a substantial influence on the parameters of the emission band of an molecule found at the argon/krypton boundary. The results of this study demonstrate the high efficiency of VUV spectroscopy for studying processes of heteroatomic cluster formation in supersonic jets.