Detection of high mass cluster ions sputtered from Bi surfaces

Shepard, A. T.; Hewitt, R. W.; Slusser, George J.; Baitinger, W. E.; Cooks, R. Graham; Winograd, Nicholas; Delgass, W. Nicholas; Varon, A.; Devant, G.

doi:10.1016/0009-2614(76)80533-7

Cited by 16 publications

(5 citation statements)

References 5 publications

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“…Prominent stoichiometries for both metals are M 3 O 4 + , M 4 O 5 + , and M 5 O 7 + . These prominent metal oxide cations in the small size domain have been reported many years ago under laser desorption mass spectrometer conditions. − However, no clusters larger than about five metal atoms were observed and no explanations were given for these trends.…”

Section: Resultsmentioning

confidence: 85%

Antimony and Bismuth Oxide Clusters: Growth and Decomposition of New Magic Number Clusters

et al. 1997

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A series of new “magic number” metal oxide clusters are described for the group V metals antimony and bismuth. Specific nonstatistical stoichiometries of M x O y cation and anion clusters are formed preferentially in the gas phase when oxidized metal is vaporized or when metal is vaporized and combined with gas phase oxygen (e.g., Bi7O10 +, Bi9O14 +). Essentially the same stoichiometries are seen for antimony and bismuth analogues. The species produced in cluster growth are also produced preferentially by photodissociation of larger clusters. Localized covalent bonding schemes are suggested for these clusters, and polyhedral cage structures are proposed. The stoichiometries observed require a 3+ metal oxidation state in the small clusters, which shifts over to one or more 5+ metal atoms in larger clusters.

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Section: Resultsmentioning

confidence: 85%

Antimony and Bismuth Oxide Clusters: Growth and Decomposition of New Magic Number Clusters

et al. 1997

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“…The high mass capability of the quadrupole makes it a valuable tool for studying secondary molecular cluster ions. The potential for obtaining useful information from these clusters about the local atomic ordering of atoms on the surface has already been established (1,7), although a quantitative interpretation of these observations will require a more thorough understanding of the secondary emission process. In Figure 3 are results obtained for positively charged molecular clusters ejected from clean indium and silver surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…Static SIMS can yield information concerning the local atomic order through analysis of secondary molecular cluster ions. The increase in secondary ion yield due to the presence of oxygen is a well documented phenomenon (7,11,12) although it is at best only qualitatively understood and in need of further investigation. In this work, clean Pb and In surfaces are exposed to several doses of oxygen with successive monitoring by both XPS and static SIMS, (7P+ = 2 X 10"9 A cm"2 at 2 KeV of argon).…”

Section: Resultsmentioning

confidence: 99%

“…Recent studies, however, have been completed for metals using classical trajectory methods to calculate the positions and momenta of all particles in a model microcrystallite as a function of time subsequent to the ion bombardment process (17)(18)(19)(20). In these studies metal clusters containing up to 7 atoms have been found to form by formation of ejected atoms within the interaction range, say ~4 Á, of the solid. In In Figure 6, we extropolate this scheme to the formation of metal atoms and oxygen atoms over the solid to test possible oxidation schemes on the Pb surfaces.…”

Section: Resultsmentioning

confidence: 99%

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Characterization of metal surfaces by secondary ion mass spectrometry x-ray photoelectron spectroscopy

Hewitt¹,

Shepard²,

Baitinger³

et al. 1978

Anal. Chem.

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“…N+ (500 eV)g + eM" -* N (500 eV)g (2) charge exchange N2 (500 eV)g + M9 -2N (-250 eV)s (3) dissociation at surface 2N (-250 eV)s + M -Nb (4) N (500 eV)g + M -Nb (5) penetration of atoms into bulk xM + yN -» MzNy (6) chemical reaction…”

Section: Discussionmentioning

confidence: 99%

Chemical reactions of N2+ ion beams with first-row transition metals

Lancaster¹,

Rabalais²

1979

J. Phys. Chem.

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Ion beam studies of chemical reactions between nitrogen and surfaces of the first-row transition metals are reported. X-ray photoelectron spectroscopy (XPS) and thermal desorption mass spectrometry under ultra-high vacuum conditions are used to examine the products induced by 30-3000-eV N2+ beams on the polycrystalline metal foils. The reaction results in the formation of metal nitrides which are similar to the pure metal nitride compounds. The amount of nitrogen reacting with the metal can be correlated to the enthalpy of formation of the metal nitride. Estimates of the thickness of the reacted layer are obtained from LSS projected ion range calculations. The chemical nature of the reaction is supported by identification of the products through energy level shifts and by the agreement with thermodynamic predictions. A mechanism is proposed for the reaction which involves charge exchange neutralization and dissociation of the ion at the surface followed by penetration into the lattice, thermalization, and finally chemical reaction.

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Detection of high mass cluster ions sputtered from Bi surfaces

Cited by 16 publications

References 5 publications

Antimony and Bismuth Oxide Clusters: Growth and Decomposition of New Magic Number Clusters

Antimony and Bismuth Oxide Clusters: Growth and Decomposition of New Magic Number Clusters

Characterization of metal surfaces by secondary ion mass spectrometry x-ray photoelectron spectroscopy

Chemical reactions of N2+ ion beams with first-row transition metals

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