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  • 1
    Electronic Resource
    Electronic Resource
    Fermi resonances and local modes in stibine, SbH3: A Fourier interferometric and laser photoacoustic study of the overtone spectrum (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 488-498 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The third stretching overtone region of a natural sample of stibine, SbH3, has been studied with high resolution infrared spectroscopy and the fifth and the sixth overtone region with Ti:Sapphire ring laser intracavity photoacoustic spectroscopy. The third overtone consists of a local mode pair of bands (400A1/E) which have been rotationally assigned both for 121SbH3 and 123SbH3 with a vibration-rotation model based on rectilinear normal coordinates. The vibrational dependencies of the model parameters are explained well with a simple block diagonal vibrational model. An extension of the standard vibration-rotation model is used to show that the upper state rotational energy level structures of both isotopic species are close to the rotational structure of an asymmetric rotor. High resolution laser spectrum of the fifth overtone consisting of a local mode pair of bands (600A1/E) shows severe perturbations in the upper state rotational structure. The (510A1/E) and (700A1/E) bands have been recorded with low resolution. All experimentally known vibration-rotation band origins of 121SbH3 have been reproduced well with a curvilinear internal valence coordinate system based Fermi resonance local mode model. The potential energy surface obtained agrees well with recent ab initio results. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470845
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  • 2
    Electronic Resource
    Electronic Resource
    Novel (fluoromethyl)silicon derivatives from (fluorodibromomethyl)silane precursors (1993)
    s.l. : American Chemical Society
    Organometallics 12 (1993), S. 4930-4939 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00036a037
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  • 3
    Electronic Resource
    Electronic Resource
    The Si–H stretching–bending overtone polyads of SiHF3: Assignments, band intensities, internal coordinate force field, and ab initio dipole moment surfaces (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 1378-1391 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Fourier transform overtone spectra of SiHF3 were recorded in the region of 2500–9000 cm−1 and vibrationally assigned. Experimental intensities were estimated. The 3ν1 overtone band at 6753 cm−1 was observed to be more than 10 times weaker than the 4ν1 band. A reduced three-dimensional Hamiltonian model in terms of internal coordinates was employed to study the Si–H stretching and bending vibrations including 5ν1 and 6ν1 which were recently recorded using optoacoustic spectroscopy. Potential energy parameters were optimized by fitting to experimental band centers. The Fermi resonance between the Si–H stretching and bending motions was found to be insignificant. Band intensities were computed using ab initio one- and three-dimensional dipole moment surfaces (DMS) expanded to polynomials in terms of symmetrized internal coordinates. The intensity anomaly of 3ν1 is understood as resulting from cancellation of contributions by the linear and quadratic terms in the DMS expansion. The behavior of X–H stretching overtone intensities as excitation increases was also studied in the low and medium energy regions. Whether a rapid or a slow decrease of intensity occurs with increasing excitation depends strongly on the nonlinearity of the DMS. For some molecules, there is an almost complete cancellation of contributions from the lower order terms in the DMS so that the accuracy of the computed overtone intensities is mainly limited by the uncertainty of the higher order expansion coefficients in the DMS. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1376393
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  • 4
    Electronic Resource
    Electronic Resource
    Local-mode effects on the rotational structure of the first stretching overtone band system of stibine, SbH3 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 7099-7107 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A high-resolution Fourier-transform infrared spectrum, resolution about 0.006 cm−1, of the first stretching overtone band system of stibine has been measured and rotationally analyzed in detail up to J'=22 for both 121SbH3 and 123SbH3 isotopic species. The rotational levels of the A1 and E vibrational states have been analyzed simultaneously by including vibration–rotation coupling terms in the Hamiltonian for the two isotopic species. The A1/E vibrational energy-level separation has been found to be 0.0727(8) cm−1 for 121SbH3 and 0.0763(8) cm−1 for 123SbH3 with the A1 state being higher in energy in both cases. Fits including 1445 transitions with the standard deviation of 0.0024 cm−1 for 121SbH3 and 1322 transitions with the standard deviation of 0.0022 cm−1 for 123SbH3 have been obtained by optimizing altogether 33 upper-state parameters in both cases. A simple local-mode model is shown to account very well for the vibrational dependence of the rotational constants and the coefficients of vibrationally off-diagonal H22 operators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461819
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  • 5
    Electronic Resource
    Electronic Resource
    Rotational analysis of the (2000) stretching vibrational band system of 116SnH4 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1607-1612 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A high resolution Fourier transform infrared spectrum, resolution (FWHM) 10.5×10−3 cm−1, of the (2000, A1/F2) stretching vibrational band system of 116SnH4 has been measured and analyzed in detail up to J=20. The rotational levels of the two vibrational states A1 and F2 are treated simultaneously by including vibration–rotation coupling terms in the Hamiltonian. 1290 infrared transitions from the ground vibrational state to the excited (2000) states have been included as data in the least squares optimization of 21 Hamiltonian parameters. The standard deviation of the fit obtained is 1.1×10−3 cm−1. The upper state vibrational energy level separation has been determined to be 0.0908 (5) cm−1 with the A1 state being higher in energy than the F2 state. The effective rovibrational parameters are found to satisfy closely the local mode constraints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459088
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  • 6
    Electronic Resource
    Electronic Resource
    Rotations and local modes in stannane, 116SnH4: Photoacoustic overtone spectra with a titanium:sapphire ring laser (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 3911-3918 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The fifth and the seventh stretching vibrational overtone bands of a monoisotopic stannane sample, 116SnH4, have been recorded with Doppler limited resolution using intracavity photoacoustic technique with a titanium:sapphire ring laser. Both band systems resemble closely symmetric top parallel bands in agreement with local mode predictions. The rotational fine structures of these bands have been analyzed with the symmetric top energy level formula and with a spherical top Hamiltonian which treats the problems as interacting rotational levels of A1 and F2 vibrations. Altogether about 200 vibration–rotation transitions have been assigned for both band systems. The fifth overtone band system shows some minor local perturbations due to interactions with bending states. The seventh overtone band is completely unperturbed. The observed vibration–rotation parameters are in good agreement with the ones calculated from a simple vibrational model. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468550
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  • 7
    Electronic Resource
    Electronic Resource
    Overtone spectrum of stannane: experiment and theoretical analysis (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 5222-5226 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100376a009
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  • 8
    Electronic Resource
    Electronic Resource
    Stretching vibrational overtone spectrum of arsine and stibine (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 4225-4231 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100190a024
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  • 9
    Electronic Resource
    Electronic Resource
    Motorische Untersuchungen bei Paralysen (1928)
    Springer
    Journal of neurology 107 (1928), S. 151-154 
    Details
    ISSN: 1432-1459
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01660138
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  • 10
    Electronic Resource
    Electronic Resource
    Novel inorganic ring systems. XL: A dimeric cycloalumadisiladiazane (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 1271-1280 
    Details
    ISSN: 1434-4475
    Keywords: Aluminum compounds ; Silicon-nitrogen chemistry ; X-ray diffraction structure analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das erste Cycloalumadisiladiazan (F1) wurde durch Reaktion von dilithiiertem 1,2-Bis(methylamino)tetramethyldisilan mit AlCl3 bei −80°C erhalten und durch Elementaranalyse,1H-NMR, Massenspektroskopie und eine Einkristall-Röntgenstrukturanalyse charakterisiert.F1 kristallisiert in der orthorhombischen Raumgruppe Pbca mita=8,3506 (4),b=16,1056 (8),c=19,1186 (6) Å,Z=4 undd ber 1,22 g/cm3. Die Struktur wurde für 1 810 mit Zählrohr-Technik gemessene Reflexe mit einem konventionellenR-Wert von 0,030 verfeinert. Im Kristall liegen isolierte, stickstoffverbrückte dimere Moleküle vor, die kristallographische $$\bar 1$$ -Symmetrie aufweisen. Sowohl NMR- als auch Massenspektren weisen nach, daß diese Struktur auch in Lösung und in der Gasphase erhalten bleibt.
    Notes: Abstract The first cycloalumadisiladiazane (F1) has been prepared by reacting dilithiated 1,2-bis(methylamino)tetramethyldisilane with AlCl3 at −80°C. The compound has been characterized by elemental analysis,1H NMR, mass spectroscopy and single crystal X-ray diffraction. Crystals belong to the orthorhombic space group Pbca witha=8.3506 (4),b=16.1056 (8),c=19.1186 (6) Å,Z=4 andd calc=1.22 g/cm3. The structure was refined to a conventionalR value of 0.030 using 1 810 counter-measured, observed reflections. The crystal contains discrete nitrogen bridged dimeric molecules possessing crystallographic $$\bar 1$$ symmetry. Both NMR and mass spectral data indicate that this structure persists in solution and in the gas phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798638
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