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Vibrational spectroscopy of neutral silicon clusters via far-IR-VUV two color ionization
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Figures

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FIG. 1.

(a) Mass spectra of silicon clusters obtained upon ionization with 7.87 eV VUV photons. (b) Initial irradiation of the neutral cluster distribution with intense IR light at leads to a sixfold increase in the signal of , while the remaining mass spectrum is unchanged. (c) Upon irradiation with infrared light of enhancement of the intensities of and is observed.

Image of FIG. 2.

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FIG. 2.

Comparison of experimental IR spectra for with predictions from theory. The experimental spectra are assembled from data obtained in three independent runs similarly as described before (Ref. 20). The (blue) dots are the resulting original data points, while the (red) lines correspond to a three-point adjacent average. Experimental absorption cross sections are given on a linear scale in arbitrary units. The solid lines in the calculated spectra represent the results from DFT, while the dashed lines correspond to the MP2 calculations. Calculated frequencies are linearly scaled by a factor of 1.03 (DFT) (Table I) and 0.96 (MP2), respectively, and the stick spectra are folded with a Gaussian line width function of full width at half maximum.

Tables

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Table I.

Assignments of experimentally observed IR bands and comparison with values calculated by DFT (frequencies scaled by a factor of 1.03). The experimental frequencies have an estimated uncertainty of .

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/content/aip/journal/jcp/131/17/10.1063/1.3262803
2009-11-05
2014-04-19

Abstract

Tunable far-infrared-vacuum-ultraviolet two color ionization is used to obtain vibrational spectra of neutral silicon clusters in the gas phase. Upon excitation with tunable infrared light prior to irradiation with UVphotons we observe strong enhancements in the mass spectrometric signal of specific cluster sizes. This allowed the recording of the infrared absorption spectra of , , and . Structural assignments were made by comparison with calculated linear absorption spectra from quantum chemical theory.

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Scitation: Vibrational spectroscopy of neutral silicon clusters via far-IR-VUV two color ionization
http://aip.metastore.ingenta.com/content/aip/journal/jcp/131/17/10.1063/1.3262803
10.1063/1.3262803
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