Laser mass spectrometric studies of high temperature superconductor ablation
Laser ablation of bulk High Temperature Superconductor (HTS) material promises to provide a useful means of producing high quality HTS thin films. Mass spectrometric probes of the ablation plume provide a microscopic understanding of the ablation event and plume development as well as providing a process monitor for the thin film production. Detection of the nascent ions in the plume provides real time analytical information, e.g., identification of impurities, major and minor ablation species, etc. The common contaminants sodium and strontium have been easily detected by this technique in a variety of different HTS bulk materials. In contrast, detection of the ablated neutral species by Resonance Ionization Mass Spectrometry (RIMS) provides physical information about the ablation process. Time-of-flight/RIMS detection of Cu, Y, and BaO ablated from YBa{sub 2}Cu{sub 3}O{sub x} indicates the ablation involves post-desorption gas phase collisions, thereby influencing the ablation chemistry and dynamics (e.g., angular and velocity distributions). Approximately equal velocities are observed for all neutral species at constant ablation laser fluence. 17 refs., 4 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- Sponsoring Organization:
- DOE/MA
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 7008023
- Report Number(s):
- LA-UR-90-165; CONF-900140--10; ON: DE90006518
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
42 ENGINEERING
426001 -- Engineering-- Superconducting Devices & Circuits-- (1990-)
426002 -- Engineering-- Lasers & Masers-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ABLATION
CHARGED PARTICLE DETECTION
CONTROL
DETECTION
DIFFERENTIAL EQUATIONS
DOCUMENTATION
EFFICIENCY
EQUATIONS
FILMS
FLUID FLOW
FUNCTIONS
GAS FLOW
GAUSS FUNCTION
ION DETECTION
IONIZATION
KNUDSEN FLOW
LASERS
MANUFACTURING
MASS SPECTROSCOPY
MATHEMATICAL MODELS
MAXWELL EQUATIONS
MEASURING METHODS
PARTIAL DIFFERENTIAL EQUATIONS
PHOTOIONIZATION
PLASMA
PLUMES
PRESSURE EFFECTS
QUALITY CONTROL
RADIATION DETECTION
SAMPLING
SPECTROSCOPY
SUPERCONDUCTORS
TECHNOLOGY ASSESSMENT
TEMPERATURE EFFECTS
THIN FILMS
TIME MEASUREMENT