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Title: Laser fluorescence spectroscopy of sputtered uranium atoms. [Mechanisms, 3 keV]

Abstract

Laser induced fluorescence (LIF) spectroscopy was used to study the sputtering of 99.8% /sup 238/U metal foil when bombarded by normally incident 500 to 3000 eV Ne/sup +/, Ar/sup +/, Kr/sup +/, and O/sub 2//sup +/. A three-level atom model of the LIF processes is developed to interpret the observed fluorescent emission from the sputtered species. The model shows that close attention must be paid to the conditions under which the experiment is carried out as well as to the details of the collision cascade theory of sputtering. Rigorous analysis shows that when properly applied, LIF can be used to investigate the predictions of sputtering theory as regards energy distributions of sputtered particles and for the determination of sputtering yields. The possibility that thermal emission may occur during sputtering can also be tested using the proposed model. It is shown that the velocity distribution (either the number density or flux density distribution, depending upon the experimental conditions) of the sputtered particles can be determined using the LIF technique and that this information can be used to obtain a description of the basic sputtering mechanisms. These matters are discussed using the U-atom fluorescence measurements as a basis. The relative sputtering yieldsmore » for various incident ions on uranium were also measured for the first time using the LIF technique. A surprisingly high fraction of the sputtered uranium atoms were found to occupy the low lying metastable energy levels of U(I). The population of the sputtered metastable atoms were found approximately to obey a Boltzman distribution with an effective temperature of 920 +- 100/sup 0/K. 41 references.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
Sponsoring Org.:
USDOE
OSTI Identifier:
5788502
Report Number(s):
CONF-790843-8
TRN: 79-021735
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 8. international conference on atomic collisions in solids, Hamilton, Canada, 13 Aug 1979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ARGON IONS; COLLISIONS; KRYPTON IONS; NEON IONS; OXYGEN IONS; PHOTON COLLISIONS; FLUORESCENCE; URANIUM; ENERGY LEVELS; METASTABLE STATES; SPUTTERING; ATOMIC MODELS; BOLTZMANN STATISTICS; CATIONS; DISTRIBUTION; DOPPLER EFFECT; ENERGY SPECTRA; EXPERIMENTAL DATA; FLUX DENSITY; GRAPHS; ION COLLISIONS; ISOLATED VALUES; KEV RANGE 01-10; LASER RADIATION; URANIUM 238; VELOCITY; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ACTINIDES; ALPHA DECAY RADIOISOTOPES; CHARGED PARTICLES; DATA; DATA FORMS; ELECTROMAGNETIC RADIATION; ELEMENTS; ENERGY RANGE; EVEN-EVEN NUCLEI; EXCITED STATES; HEAVY NUCLEI; INFORMATION; IONS; ISOTOPES; KEV RANGE; LUMINESCENCE; MATHEMATICAL MODELS; METALS; NUCLEI; NUMERICAL DATA; RADIATIONS; RADIOISOTOPES; SPECTRA; URANIUM ISOTOPES; YEARS LIVING RADIOISOTOPES; 640301* - Atomic, Molecular & Chemical Physics- Beams & their Reactions

Citation Formats

Wright, R. B., Pellin, M. J., Gruen, D. M., and Young, C. E. Laser fluorescence spectroscopy of sputtered uranium atoms. [Mechanisms, 3 keV]. United States: N. p., 1979. Web.
Wright, R. B., Pellin, M. J., Gruen, D. M., & Young, C. E. Laser fluorescence spectroscopy of sputtered uranium atoms. [Mechanisms, 3 keV]. United States.
Wright, R. B., Pellin, M. J., Gruen, D. M., and Young, C. E. Mon . "Laser fluorescence spectroscopy of sputtered uranium atoms. [Mechanisms, 3 keV]". United States. https://www.osti.gov/servlets/purl/5788502.
@article{osti_5788502,
title = {Laser fluorescence spectroscopy of sputtered uranium atoms. [Mechanisms, 3 keV]},
author = {Wright, R. B. and Pellin, M. J. and Gruen, D. M. and Young, C. E.},
abstractNote = {Laser induced fluorescence (LIF) spectroscopy was used to study the sputtering of 99.8% /sup 238/U metal foil when bombarded by normally incident 500 to 3000 eV Ne/sup +/, Ar/sup +/, Kr/sup +/, and O/sub 2//sup +/. A three-level atom model of the LIF processes is developed to interpret the observed fluorescent emission from the sputtered species. The model shows that close attention must be paid to the conditions under which the experiment is carried out as well as to the details of the collision cascade theory of sputtering. Rigorous analysis shows that when properly applied, LIF can be used to investigate the predictions of sputtering theory as regards energy distributions of sputtered particles and for the determination of sputtering yields. The possibility that thermal emission may occur during sputtering can also be tested using the proposed model. It is shown that the velocity distribution (either the number density or flux density distribution, depending upon the experimental conditions) of the sputtered particles can be determined using the LIF technique and that this information can be used to obtain a description of the basic sputtering mechanisms. These matters are discussed using the U-atom fluorescence measurements as a basis. The relative sputtering yields for various incident ions on uranium were also measured for the first time using the LIF technique. A surprisingly high fraction of the sputtered uranium atoms were found to occupy the low lying metastable energy levels of U(I). The population of the sputtered metastable atoms were found approximately to obey a Boltzman distribution with an effective temperature of 920 +- 100/sup 0/K. 41 references.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

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