Spatial resolved emission spectroscopic sturdy on laser plume of Y1Ba2Cu3Ox at different oxygen pressures

To investigate the characteristics of the plume generated by the laser ablation of Y1Ba2Cu3Ox, emmission spectra of the ejected species were observed at different distances from the target in an oxygen atmosphere. It was found that velocities of ejected species increased with the distance from the target. At 35 mm from the target the emission intensities of Y, Ba, O atoms, and YO molecules dractically increased to an order of magnitude larger beyond several tens mTorr of oxygen pressure. This increase of emission intenstiy was due to the increment of the plasma density by a shock formt formed at similar to 35 mm. Above 0.5 Torr of oxyge pressure, molecular YO was produced by the oxidation of Y atoms. The plasma temperature was also elevated by shock heating. (C) 1996 American Institute of Physics.