Transport of charge and atomic particles in Rydberg state-rich plasmas

摘要: New methods make it possible to form considerable flux densities of Rydberg atoms alkali metals. It is now study the transport processes in regions where density large. Examples such studies have been given by Svensson and coworkers. In present study, ions states are formed desorption at 1300-1800 K from an Ir surface covered a thin graphite layer. Due very large cross sections for collision involving species, state-rich plasma between emitter cold grid electrode not free, even pressure mbar. Electron or emission takes place rate controlled . The transition penetration through cloud excited species observed directly molecular beam ion sampling detectors separate chamber. There space-charge limited behaviour positive current as well as, some modes, clear saturation current, which shows that little gas phase ionization place. A larger than expected maxima voltage dependences high densities. These effects probably caused space charge compensation due dielectric condensed means, example, effective distance decreased, observed. temperature variation gives activation energy , while This agrees with electronic excitations 0.90 eV 0.84 eV, should be important steps thermal excitation process ground state Cs.