AVS 47th International Symposium
    Surface Science Wednesday Sessions
       Session SS2-WeM

Paper SS2-WeM8
Interaction of Laser Impulse with YBA@sub2@CU@sub3@O@sub7@ Target and Generation of Four Element Plasma

Wednesday, October 4, 2000, 10:40 am, Room 209

Session: Stimulated Surface Processes
Presenter: I.Yu. Davletov, Urganch State University, Uzbekistan
Authors: I.Yu. Davletov, Urganch State University, Uzbekistan
M.R. Bedilov, Tashkent State University, Uzbekistan
R.M. Bedilov, Tashkent State University, Uzbekistan
Correspondent: Click to Email
In this work the results of studies of interactions of laser radiation with HTSC-targets are presented. The experiments have been performed by using a laser mass-spectrometer and HTSC-materials in the from of tablets of 1,0 cm diameter and thickness 0,5 cm. It was established experimentally that along with heating, destroying and evaporation of the target under interaction of the laser radiation at q>10@super9@ W/cm@super2@ with HTSC-targets, the four element plasma has been formed. Mass, charge, velocity, time and energy spectra of ions emitted from HTSC-target were studied in a wide range of the laser power. It was revealed that mass-spectra of HTSC-target atom ionized by the laser radiation contained not only one-charged ion peaks of basic element of the target but also signals of multiply charged atoms of the elements. The experiment showed, that ions with Z>1 are emitted from the HTSC-target by one-electron mechanisms of ionization of the four-element target by the laser radiation in the range of 10@super8@ W/cm@super2@ - 10@super11@ W/cm@super2@ (branch feature). Note that the formation of target ions Y@super+1@ , Cu@super+1@, Ba@super+1@, O@super+1@ begins at the power density of the laser radiation q@super8@ W/cm@super2@, and Cu@super+2@, Y@super+2@ at q@super2@ W/cm@super2@. The charge and energy distributions of the multicharged ions of the HTSC-target are determined by processes of triple recombination and energy exchange of non. Coulombic collisions between them. The energety spectra of the HTSC-target ions are analogous to those of a mono-element target, but the decreasing of the maximal energy of the ions of each multiplicity resulted from energetic losses due to Coulombic collections. The influence of oxygen state in the HTSC-target is established.