TITLE

Millimeter- and submillimeter-wave spectroscopy of dibridged Si2H2 isotopomers: Experimental and theoretical structure

AUTHOR(S)
Bogey, M.; Bolvin, H.; Cordonnier, M.; Demuynck, C.; Destombes, J. L.; Császár, A. G.
PUB. DATE
June 1994
SOURCE
Journal of Chemical Physics;6/15/1994, Vol. 100 Issue 12, p8614
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Various isotopomers of the free dibridged disilyne molecule, Si(H2)Si, have been observed by millimeter- and submillimeter-wave spectroscopy in a silane–argon plasma produced by an abnormal electric discharge. In order to make measurement of the weak absorption lines possible a novel computer processing treatment has been developed. From the molecular constants measured for 28Si(H2)28Si, 29Si(H2)28Si, 30Si(H2)28Si, and 28Si(D2)28Si an accurate substitution structure has been deduced with rs(Si–Si)=2.2154 Å, rs(Si–H)=1.6680 Å, and /_ (HSiSiH)=104.22°. The spectrum analysis and the structure determination have been aided by correlated level ab initio calculations resulting in accurate estimates of the equilibrium geometry and rotational constants, the cubic force field, the quartic and sextic centrifugal distortion constants, and the inversion barrier height of dibridged disilyne. The barrier to inversion of the ‘‘butterfly-type’’ Si(H2)Si molecule must be relatively high as no splitting due to inversion could be experimentally observed.
ACCESSION #
7641887

 

Related Articles

  • A Monte Carlo study of spectroscopy in nanoconfined solvents. Thompson, Ward H. // Journal of Chemical Physics;10/8/2002, Vol. 117 Issue 14, p6618 

    The absorption and fluorescence spectra of a model diatomic molecule with a charge-transfer electronic transition are simulated. The effect of confining the solvent in which the diatomic molecule is dissolved is examined by comparing results for solutions contained within hydrophobic spherical...

  • How the Molecule Number Is Correctly Quantified in Two-Color Fluorescence Cross-Correlation Spectroscopy: Corrections for Cross-Talk and Quenching in Experiments. F�ldes-Papp, Zeno // Current Pharmaceutical Biotechnology;Dec2005, Vol. 6 Issue 6, p437 

    Fluorescence correlation spectroscopy (FCS) and two-color fluorescence cross-correlation spectroscopy (FCCS) are among the cutting-edge technologies for measuring molecule numbers at the single-molecule level in liquid phases. Yet, even after single molecule technologies caught up with theory,...

  • Dynamics of iron in Fe-porphyrin aggregates studied by X-ray absorption and Mössbauer spectroscopy. Dziedzic-Kocurek, Katarzyna; Stanek, Jan; Burda, Kvetoslava // Hyperfine Interactions;2008, Vol. 185 Issue 1-3, p87 

    The iron-porphyrin aggregates were studied by optical absorption and fluorescence method, infrared spectroscopy, X-ray absorption and Mössbauer spectroscopy. The aggregation of porphyrin molecules strengthens the Fe-ligands bonds and accelerates the spin-spin relaxations. A significant...

  • Rydberg states of the Ar2 molecule. Kane, D. J.; Kim, S. B.; Shannon, D. C.; Herring, C. M.; Eden, J. G.; Ginter, M. L. // Journal of Chemical Physics;5/1/1992, Vol. 96 Issue 9, p6407 

    Extensive spectra attributable to transitions from the 4sσ a 3Σ+ metastable state of Ar2 to excited Rydberg states have been observed by intracavity absorption spectroscopy and by laser excitation spectroscopy in the afterglow of a pulsed corona discharge. Of these the most extensive and...

  • HXeCCH in Ar and Kr matrices. Tanskanen, Hanna; Khriachtchev, Leonid; Lundell, Jan; Räsänen, Markku // Journal of Chemical Physics;8/21/2006, Vol. 125 Issue 7, p074501 

    HXeCCH molecule is prepared in Ar and Kr matrices and characterized by IR absorption spectroscopy. The experiments show that HXeCCH can be made in another host than the polarizable Xe environment. The H–Xe stretching absorption of HXeCCH in Ar and Kr is blueshifted from the value measured...

  • Far-infrared permanent and induced dipole absorption of diatomic molecules in rare-gas fluids. I. Spectral theory. Roco, J. M. M.; Hernández, A. Calvo; Velasco, S. // Journal of Chemical Physics;12/1/1995, Vol. 103 Issue 21, p9161 

    We present a spectral theory for the far-infrared absorption spectrum of a very diluted solution of diatomic molecules in a rare-gas fluid, that includes permanent and induced contributions. The absorption coefficient is given as the convolution of a translational spectrum and a rotational...

  • Simple optical method for measuring the temperature of an incandescent filament under vacuum. Zelenskii, S. E. // Journal of Applied Spectroscopy;May2006, Vol. 73 Issue 3, p470 

    A new optical method is proposed for measuring the temperature of an incandescent filament under vacuum. The method is based on measurement of the intensity of thermal radiation at one fixed wavelength while varying the magnitude of the filament current, without using a calibrated reference...

  • The pure rotational spectrum of HPS (X1A′): Chemical bonding in second-row elements. Halfen, D. T.; Clouthier, D. J.; Ziurys, L. M.; Lattanzi, V.; McCarthy, M. C.; Thaddeus, P.; Thorwirth, S. // Journal of Chemical Physics;4/7/2011, Vol. 134 Issue 13, p134302 

    The pure rotational spectrum of HPS, as well as its 34S and D isotopologues, has been recorded at microwave, millimeter, and submillimeter wavelengths, the first observation of this molecule in the gas phase. The data were obtained using a combination of millimeter direct absorption, Fourier...

  • Nonisothermal and isothermal discharging currents in polyethylene terephthalate at elevated... Neagu, Eugen R.; Marat-Mendes, Jose N. // Journal of Applied Physics;2/15/1999, Vol. 85 Issue 4, p2330 

    Presents information on a study which reported the results of thermally stimulated discharge current and isothermally final discharge current spectrum for polyethylene terepthalate. Experimental results; Discussion; Conclusion.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics