VELOCITY DISTRIBUTION OF BA-ABLATION OF A HIGH-TEMPERATURE SUPERCONDUCTING TARGET( IONS IN A PL ASMA FORMED BY LASER)

A time-of-flight method was used in an experimental investigation of t he distribution of the velocities of Ba+ ions in a plasma formed by th e action of KrF laser radiation on ceramic YBa2Cu3O7. A bimodal distri bution of the ion velocities was observed for a laser radiation energy density of 3 J/cm(2). The size of the initial expansion region, where an important role was played by plasma recombination, was determined.