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Main Title: Vibrational spectra and structures of SinC clusters (n=3-8)
Author(s): Nguyen Xuan Truong
Savoca, Marco
Harding, Dan J.
Fielicke, André
Dopfer, Otto
Type: Article
Language Code: en
Abstract: The effects of doping bare silicon clusters with carbon on their physical properties are of fundamental interest for the chemistry of the interstellar medium and the development of novel nanostructures in materials science. Carbon-doped silicon clusters (SinC, n = 3-8) are characterized in the gas phase with infrared-ultraviolet two-color ionization (IR-UV2CI) spectroscopy, mass spectrometry, and quantum chemical calculations. Structural identification is achieved by comparing the measured and calculated vibrational absorption spectra of the low-energy SinC isomers identified by global optimization algorithms. Except for planar Si3C, the most stable SinC clusters have three-dimensional configurations. While the Si3C and Si6C structures are uniquely assigned, several stable isomers of Si4C, Si5C, Si7C, and Si8C may co-exist under the present experimental conditions. Interestingly, some of the structures observed here are different from the ground state structures predicted previously. For the small neutral clusters (n <= 5), structures similar to those reported previously for the anions are observed. The highly stable Si3C unit with a nearly linear Si-C-Si motif is identified as characteristic building block in several of the most stable SinC structures. In all identified structures, a large negative charge of almost -2e is located on the C atom, indicating its role as electron donor in the Si-n host moiety. The B3LYP/cc-pVTZ level proves reliable in finding the experimentally observed isomers.
Issue Date: 2015
Date Available: 25-Oct-2017
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: EC/FP7/226716/EU/European Light Sources Activities - Synchrotrons and Free Electron Lasers/ELISA
DFG, FOR 1282, Controlling the electronic structure of semiconductor nanoparticles by doping and hybrid formation
Journal Title: Physical chemistry, chemical physics
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 17
Issue: 29
Publisher DOI: 10.1039/c5cp02588e
Page Start: 18961
Page End: 18970
EISSN: 1463-9084
ISSN: 1463-9076
Appears in Collections:FG Lasermolekülspektroskopie und Umweltphysik » Publications

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