Characterization of ground state neutral and ion transport during laser ablation of 1:2:3 superconductors by transient optical absorption spectroscopy
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
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
42 ENGINEERING
47 OTHER INSTRUMENTATION
EXCIMER LASERS
SUPERCONDUCTIVITY
ABLATION
ABSORPTION
BARIUM
COPPER
DEBYE LENGTH
DESIGN
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
MAXWELL EQUATIONS
MEASURING METHODS
MECHANICAL PROPERTIES
OPTICAL PROPERTIES
OPTIMIZATION
OXYGEN
PERFORMANCE TESTING
PLUMES
PROBES
SAMPLING
SPACE DEPENDENCE
STATISTICAL MODELS
TIME DEPENDENCE
TRANSIENTS
TRANSPORT THEORY
VELOCITY
YTTRIUM
YTTRIUM IONS
ALKALINE EARTH METALS
CHARGED PARTICLES
DATA
DIFFERENTIAL EQUATIONS
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EMISSION SPECTROSCOPY
EQUATIONS
GAS LASERS
INFORMATION
IONS
LASERS
LENGTH
MATHEMATICAL MODELS
METALS
NONMETALS
NUMERICAL DATA
PARTIAL DIFFERENTIAL EQUATIONS
PHYSICAL PROPERTIES
SPECTROSCOPY
TESTING
TRANSITION ELEMENTS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
426001 - Engineering- Superconducting Devices & Circuits- (1990-)
426002 - Engineering- Lasers & Masers- (1990-)
440800 - Miscellaneous Instrumentation- (1990-)