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  • 1
    Electronic Resource
    Electronic Resource
    Erratum: Near infrared spectroscopic observation of the linear and cyclic isomers of the hydrogen cyanide trimer [J. Chem. Phys. 88, 2196 (1988)] (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1206-1206 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455761
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  • 2
    Electronic Resource
    Electronic Resource
    Sub-Doppler resolution infrared spectra of the isoelectronic pair: N2–HCN and OC–HCN (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1262-1267 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Sub-Doppler resolution infrared spectra have been obtained for the ν1 bands of N2 –HCN and OC–HCN using the opto-thermal detection method, from which accurate ground and excited state molecular constants are determined. Vibrational predissociation lifetimes are estimated from the homogeneous broadening of the observed transitions, giving lifetimes of 80 and 2.6 ns for N2 –HCN and OC–HCN, respectively. These lifetimes are considerably longer than those obtained previously for N2 –HF and OC–HF. This difference can be understood in terms of the strength of the coupling between the intra- and intermolecular motions, which is also reflected in the vibrational frequency shift associated with complex formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455178
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  • 3
    Electronic Resource
    Electronic Resource
    Near infrared spectroscopic observation of the linear and cyclic isomers of the hydrogen cyanide trimer (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2196-2204 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Sub-Doppler resolution infrared spectra have been obtained for both the linear and cyclic conformers of the hydrogen cyanide trimer. In the case of the linear trimer, all three vibrational bands correlating with the C–H stretching fundamental of the hydrogen cyanide monomer (ν1) have been observed. The vibrational predissociation lifetime of the complex is found to be strongly mode specific. For the cyclic trimer, which has only one (doubly degenerate) infrared allowed band associated with the C–H stretch, the rotational structure is characteristic of an oblate planar symmetric top. Molecular constants are reported for both conformers. In addition, several other bands are observed in the spectrum which, although not rotationally resolved, are tentatively assigned to the tetramer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454052
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and vibrational dynamics of the CO2 dimer from the sub-Doppler infrared spectrum of the 2.7 μm Fermi diad (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2185-2195 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Sub-Doppler infrared spectra of two Fermi resonance coupled bands of carbon dioxide dimer have been obtained at 3611.5 and 3713.9 cm−1 using an optothermal molecular beam color-center laser spectrometer. The band origins for the complexes are red shifted by approximately 1 cm−1 from the corresponding ν1+ν3/2ν02+ν3 CO2 bands. The higher frequency band is perturbed while the lower frequency band appears free of extraneous perturbations as determined from a precision fit to a Watson asymmetric rotor Hamiltonian. This fit and the observed nuclear spin statistical weights reveal that the complex is planar with C2h symmetry. The C--C separation and C--C–O angle are determined to be 3.599(7) A(ring) and 58.2(8)°, respectively. The nearest neighbor O--C distance is 3.14 A(ring) which is the same as that found in the crystal. From the centrifugal distortion analysis the weak bond stretching and symmetric bending frequencies are estimated to be 32(2) and 90(1) cm−1. No interconversion tunneling is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454051
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  • 5
    Electronic Resource
    Electronic Resource
    The structure of the carbon dioxide dimer from near infrared spectroscopy (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4341-4346 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An F-center laser–molecular beam spectrometer has been used to obtain a sub-Doppler resolution infrared spectrum of the carbon dioxide dimer. The vibrational mode investigated in this study corresponds to the ν1+ν3 combination mode of the monomer located at 3716 cm−1. A qualitative assignment of the spectrum shows unambiguously that the equilibrium structure of the dimer is the slipped parallel, rather than the T-shaped, geometry. The observed spectrum cannot be fit to within experimental error using conventional asymmetric rotor formalism. This may be due to a number of factors such as Fermi resonance between the upper state levels of the band and nearby levels of the dimer, such as seen in the monomer, or it could arise from tunneling effects arising from the two large amplitude motions in the dimer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451895
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  • 6
    Electronic Resource
    Electronic Resource
    The nitrogen–hydrogen fluoride dimer: Infrared spectroscopy and vibrational predissociation (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1098-1103 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ν1 infrared spectrum of N2–HF has been observed at sub-Doppler resolution using an infrared laser–molecular beam apparatus which is based on the optothermal detection method. This spectrum has been used to obtain the following molecular constants: B1=0.107 19±0.0001 cm−1 and ν0=3918.2397±0.005 cm−1. In addition, the Stark spectrum of the R1 transition was recorded in order to determine the ground (μ0=1.991±0.008 D) and excited vibrational (μ1=2.106±0.008 D) state dipole moments of the complex. Spectra recorded at the highest resolution clearly show homogeneous broadening of the individual rotational transitions giving a predissociation lifetime of 44±10 ns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452250
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  • 7
    Electronic Resource
    Electronic Resource
    The vibrational predissociation lifetime of the HF dimer upon exciting the "free-H'' stretching vibration (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3338-3341 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A computer controlled F-center laser has been used, in conjunction with a molecular beam apparatus employing optothermal detection, to obtain an accurate measurement of the vibrational predissociation lifetime of the HF dimer following ν1 vibrational excitation. The lifetime obtained in this study is 24±2 ns. This is to be compared with a lifetime for ν2 excitation of 1.0±0.1 ns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450955
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  • 8
    Electronic Resource
    Electronic Resource
    Photofragment angular distributions for HF dimer: Scalar J–J correlations in state-to-state photodissociation (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2631-2638 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photofragment angular distributions have been measured for HF dimer which show resolved structure that can be assigned to individual fragment rotational channels. This data is used to establish intermolecular scalar correlations between the rotational states of the two HF fragments. The observed angular distributions are strongly dependent upon whether the "free'' or "hydrogen bonded'' HF stretch is initially excited. Since the infrared spectrum of the parent molecule is highly resolved, these results can be used to determine the relative state-to-state photodissociation cross sections. In addition, the zero point dissociation energy (D0 ) of the HF dimer is accurately determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455960
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  • 9
    Electronic Resource
    Electronic Resource
    Infrared Stark spectroscopy of the hydrogen–HF binary complex (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5629-5633 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A sub-Doppler resolution infrared spectrum has been measured for the HF stretch of the H2–HF complex using the optothermal detection method. Infrared Stark spectra have also been obtained from which both the ground and first vibrationally excited state dipole moments have been obtained. It is clear from these measurements that the HF subunit undergoes wide amplitude bending motion even in the zero-point bending state. Broadening of the transitions due to the finite lifetime (27 ns) of the excited vibrational state is just discernible under the highest resolution conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453535
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of vibrational state mixing on the predissociation lifetime of ν1 excited OC–HF (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6637-6645 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Sub-Doppler resolution infrared spectra have been obtained for the ν1 band of OC–HF. For most of the observed rovibrational transitions the linewidths are found to have a Lorentzian component of 190±10 MHz FWHM, presumably resulting from the vibrational predissociation of the complex. In several cases, however, perturbations, due to either anharmonic or Coriolis coupling between the vibrational state corresponding to the excited HF stretch and other vibrational states of the molecule, have been observed in the spectrum. Where these perturbations are present the width of the transitions vary with the relative contributions from the two states involved. This is explained in terms of a simple perturbative treatment of the coupling in conjunction with a Golden Rule treatment of the vibrational predissociation process. Stark measurements have also been performed in order to determine the dipole moment of the complex in the vibrationally excited state, namely μ1=2.545±0.008 D.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452410
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