Condensed states and their decay in a system of excited cesium atoms

Condensed excited states in a system of excited centers - atoms, molecules, and admixtures in solids, are considered. Particular attention is paid to experimental and theoretical data on condensed excited states of cesium ato ms. Experimental observations of these states are depicted at length and th e results of calculations of equilibrium condensate parameters are presente d. The decay of condensed excited states due both to intrinsic (radiative a nd radiationless) recombination and admixture recombination is described. T he nature of an abnormally long lifetime of the condensed state excited to high levels is discussed.