Sputtering of molecules from ZnS, CdS, and FeS sub 2

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6000485

Nikzad, S ^[1]; Calaway, W F; Pellin, M J; Young, C E; Gruen, D M ^[2]

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1. California Inst. of Tech., Pasadena, CA (USA). Dept. of Applied Physics
2. Argonne National Lab., IL (USA)

An open question remains as to whether molecules form as a result of simultaneous ejection of neighboring atoms from a solid or because of a molecular band that exists in the solid metal target before sputtering. This was addressed by sputtering experiments using a binary target, where the constituents of the sputtered molecules may not occupy nearest neighbor sites in the crystal. A study was conducted on single crystals of three metal-sulfides with two different lattice structures, using laser post-ionization mass spectrometry to detect neutral sputtered species. The single crystals used for these experiments were synthetically grown CdS and ZnS with the Wurtzite structure, and natural FeS{sub 2} with the cubic structure. The FeS{sub 2} samples were ultrasonically cleaned with trichloroethane, acetone, and methanol before insertion in the uhv chamber. The latter two solvents were used to clean CdS and ZnS. In sputtering metal sulfides of different structures, sputtered molecules with constituents that do not have a bond in the solid were observed. In the case of the metal dimers, the sputtered atom exceeds in number the metal dimer, whereas S is predominantly sputtered as S{sub 2} from all three samples. The results presented in this paper also suggest that some form of recombination mechanism (inside or outside the solid) is responsible for formation of molecules. Our data also show that the sputtered molecules form a significant percentage of the sputtered species. Therefore, it is important for quantitative analyses to obtain an accurate measure of molecular sputtering yields. 20 refs., 3 figs. (DP)

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6000485
• Report Number(s): ANL/CP-71709; CONF-901105-111; ON: DE91010279
• Resource Relation: Conference: Fall meeting of the Materials Research Society, Boston, MA (USA), 24 Nov - 1 Dec 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CADMIUM SULFIDES
SPUTTERING
IRON SULFIDES
ZINC SULFIDES
DIMERS
DISSOCIATION
EXCIMER LASERS
MASS SPECTROSCOPY
TIME-OF-FLIGHT MASS SPECTROMETERS
CADMIUM COMPOUNDS
CHALCOGENIDES
DYNAMIC MASS SPECTROMETERS
GAS LASERS
INORGANIC PHOSPHORS
IRON COMPOUNDS
LASERS
MASS SPECTROMETERS
MEASURING INSTRUMENTS
PHOSPHORS
SPECTROMETERS
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
TIME-OF-FLIGHT SPECTROMETERS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
360102* - Metals & Alloys- Structure & Phase Studies
400102 - Chemical & Spectral Procedures
400500 - Photochemistry