Interactions of low-energy electrons with the FEBID precursor chromium hexacarbonyl (Cr(CO)6).

Interactions of low-energy electrons with the FEBID precursor Cr(CO)6 have been investigated in a crossed electron-molecular beam setup coupled with a double focusing mass spectrometer with reverse geometry. Dissociative electron attachment leads to the formation of a series of anions by the loss of CO ligand units. The bare chromium anion is formed by electron capture at an electron energy of about 9 eV. Metastable decays of Cr(CO)5- into Cr(CO)4-, Cr(CO)4- into Cr(CO)3- and Cr(CO)3- into Cr(CO)2- are discussed. Electron-induced dissociation at 70 eV impact energy was found to be in agreement with previous studies. A series of Cr(CO) n C+ (0 ≤ n ≤ 3) cations formed by C-O cleavage is described for the first time. The metastable decay of Cr(CO)6+ into Cr(CO)5+ and collision-induced dissociation leading to bare Cr+, are discussed. In addition, doubly charged cations were identified and the ration between doubly and singly charged fragments was determined and compared with previous studies, showing considerable differences.

Citation

Jusuf M Khreis, João Ameixa, Filipe Ferreira da Silva, Stephan Denifl. Interactions of low-energy electrons with the FEBID precursor chromium hexacarbonyl (Cr(CO)6). Beilstein journal of nanotechnology. 2017;8:2583-2590

PMID: 29259873

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