Gas-phase structures of neutral silicon clusters

Haertelt, Marko; Lyon, Jonathan T.; Claes, Pieterjan; de Haeck, Jorg; Lievens, Peter; Fielicke, André

doi:doi:10.1063/1.3682323

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Electromagnetically induced transparency spectroscopy

We propose a method based on the electromagnetically induced transparency (EIT) phenomenon for the detection of molecules which exist as a small minority in the presence of a majority of absorbers. The EIT effect we employ effectively eliminates the absorption of the majority species in the spectral region where it overlaps with the absorption of the minority species. The method can also be used to enhance local-modes transitions which overlap spectrally with a background of other local-modes tr...

Absorption by DNA single strands of adenine isolated in vacuo: The role of multiple chromophores

The degree of electronic coupling between DNA bases is a topic being up for much debate. Here we report on the intrinsic electronic properties of isolated DNA strands in vacuo free of solvent, which is a good starting point for high-level excited states calculations. Action spectra of DNA single strands of adenine reveal sign of exciton coupling between stacked bases from blueshifted absorption bands (∼3 nm) relative to that of the dAMP mononucleotide (one adenine base). The bands are blueshifte...

Vibrational spectra of neutral silicon clusters Si_n, in the size range of n = 6–10 and for n = 15, have been measured in the gas phase by two fundamentally different IR spectroscopic methods. Silicon clusters composed of 8, 9, and 15 atoms have been studied by IR multiple photon dissociation spectroscopy of a cluster-xenon complex, while clusters containing 6, 7, 9, and 10 atoms have been studied by a tunable IR-UV two-color ionization scheme. Comparison of both methods is possible for the Si₉ cluster. By using density functional theory, an identification of the experimentally observed neutral cluster structures is possible, and the effect of charge on the structure of neutrals and cations, which have been previously studied via IR multiple photon dissociation, can be investigated. Whereas the structures of small clusters are based on bipyramidal motifs, a trigonal prism as central unit is found in larger clusters. Bond weakening due to the loss of an electron leads to a major structural change between neutral and cationic Si₈.

Article Outline

INTRODUCTION
EXPERIMENTAL AND THEORETICAL METHODS
RESULTS AND DISCUSSION
CONCLUSION

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KEYWORDS and PACS

Keywords

bonds (chemical), density functional theory, elemental semiconductors, infrared spectra, molecular clusters, molecular configurations, molecule-photon collisions, multiphoton spectra, photodissociation, silicon, ultraviolet spectra, vibrational states, xenon

PACS

36.40.Mr

Spectroscopy and geometrical structure of clusters
33.15.Bh

General molecular conformation and symmetry; stereochemistry
33.15.Mt

Rotation, vibration, and vibration-rotation constants
33.20.Ea

Infrared spectra
33.20.Lg

Ultraviolet spectra
33.80.Gj

Diffuse spectra; predissociation, photodissociation

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http://dx.doi.org/10.1063/1.3682323

PUBLICATION DATA

ISSN

0021-9606 (print)

1089-7690 (online)

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American Institute of Physics

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