Observation of small gas-phase metal-oxygen dianions

Chemical Physics Letters

Volumn 419, Issue 4-6, 2006, Pages 379-384

  Franzreb, Klaus ^a   Williams, Peter ^a  

^a ARIZONA STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

COPPER ALLOYS; ION BOMBARDMENT; MASS SPECTROMETERS; NEGATIVE IONS; OXYGEN; SPUTTERING; SURFACE PROPERTIES;

EXOTIC SPECIES; METALLIC TARGETS; SMALL METAL-OXYGEN DIANIONS;

METALS;

EID: 32344434894     PISSN: 00092614     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.cplett.2005.11.106     Document Type: Article

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25. The Cu(Be) metal foil was cut from a dynode of an old electron multiplier (Balzers). The Be bulk concentration (about ∼3% by weight) in this copper-based binary alloy was quantified indirectly by means of the electronprobe at ASU. The fact that sputtered molecules Be n - 1 O n 2 - (with n = 4, 6) could be observed for ion bombardment and oxygen flooding of this fairly dilute Cu bulk alloy (with roughly ∼20 at.% Be) suggests that Be might be enriched at the oxidized Cu(Be) surface due to preferential sputtering of Cu or other mechanisms.
26. + sputtered Cu(Be) with a mixture of toluene and air.
27. The gas-phase pentamer Be 2 O 3 2 - has been calculated by Boldyrev and Simons [26]. Its molecular structure has been predicted to be linear. However, it is not clear, if it is sufficiently stable to allow detection by mass spectrometry. The triatomic dianion BeO 2 2 - has been shown to be unstable with respect to electron tunneling loss [26]. To our knowledge, the heptamer Be 3 O 4 2 - has not yet been calculated.
28. A.I. Boldyrev, and J. Simons J. Chem. Phys. 98 1993 4745
29. + secondary ion signals, we estimate the Mg impurity concentration to be roughly 0.02 at.%. It is not known if Mg might be enriched at the oxidized Cu(Be) surface due to preferential sputtering or other processes.
30. 2 flooding also was not successful.