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Title: Characterization of ground state neutral and ion transport during laser ablation of 1:2:3 superconductors by transient optical absorption spectroscopy

Conference ·
DOI:https://doi.org/10.1557/PROC-169-501· OSTI ID:5097087

Optical absorption in the plume produced by excimer laser ablation of Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7-x} under film growth conditions has been observed for the first time and used to characterize the transport of ground state Y, Ba, and Cu neutrals as well as Y{sup +} and Ba{sup +} ions. Spatially and temporally resolved absorption measurements (0.6 mm, 20 ns resolution) indicate significant ground state number densities at times following the laser pulse that are up to an order of magnitude longer than the duration of fluorescence from excited states. Time-of-flight absorbance profiles result in velocity distributions that are broadened significantly toward lower velocities and reveal a low velocity component (<10{sup 5} cm s{sup {minus}1}) to the ablation process which is not observed using emission spectroscopy. Electric ion probe measurements of the time dependence of Y{sup +} ions confirm the existence of the new, slow velocity component. Electron densities >10{sup 16} cm{sup {minus}3} in the white plasma close to the pellet have been estimated using spectrally broadened emission lines. The effects of oxygen ambient pressures and the detection of YO, BaO, and CuO also are reported. This technique is applicable as an situ monitor of the kinetic energy of ablated species during low temperature deposition of epitaxial 1:2:3 superconducting thin films. 7 refs., 4 figs.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
DOE/ER
DOE Contract Number:
AC05-84OR21400
OSTI ID:
5097087
Report Number(s):
CONF-891119-86; ON: DE90006623
Resource Relation:
Journal Volume: 169; Conference: Materials Research Society fall meeting, Boston, MA (USA), 27 Nov - 2 Dec 1989
Country of Publication:
United States
Language:
English