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1.
Geoffrey DuxburyAlexander Alijah 《Journal of Molecular Spectroscopy》2002,211(1):31-57
The extended stretch-bender Hamiltonian, incorporating spin-orbit coupling and overall rotation, has been used to calculate the spin-vibronic structure of the rovibronic energies in the region where the vibronic states of the excited Ã2A1 electronic state of NH2 interact with near-resonant high-lying levels of the X?2B1 state of NH2. A detailed comparison has been made with the experimental measurements which were made of these rovibronic states, the majority of which are due to Ramsay, Vervloet, and their collaborators. We have shown that, as in our study of the vibronic levels of the X?2B1 state below the barrier to linearity, in order to fit the variation of the effective vibronic spin-orbit coupling constant over the whole of this energy regime, the effective linear molecule spin-orbit coupling constant, ASO must be increased from the earlier value of 50 cm−1 of Ch. Jungen, K.-E. J. Hallin, and A. Merer (Mol. Phys.40, 65-94 (1980)) to 61.6 cm−1. The impact of Fermi resonance, in both the Ã2A1 and X?2B1 states, on the observed rovibronic structure has been assessed. The pattern of calculated spin-rovibronic levels, including the effects of spin uncoupling, is in good agreement with that measured experimentally. 相似文献
2.
Borivoj Adna?evi? Bojan Jankovi? Dragica M. Mini? 《Journal of Physics and Chemistry of Solids》2010,71(7):927-985
Kinetics of the apparent isothermal and the non-isothermal crystallization of α-Fe phase within the amorphous Fe81B13Si4C2 alloy were investigated by an X-ray diffraction (XRD) and by a differential scanning calorimetry (DSC). It was established that the apparent isothermal crystallization of α-Fe phase within amorphous Fe81B13Si4C2 alloy could be described by the Johnson-Mehl-Avrami (JMA) kinetic model (with parameter niso=4.0). The apparent isothermal crystallization process includes a constant rate of nucleation and three-dimensional growth of nuclei. The results of X-ray diffraction (XRD) data of the isothermally crystallized samples confirmed the above established kinetic model. From the kinetic analysis of the non-isothermal crystallization of the α-Fe phase within this amorphous alloy, it was concluded that the autocatalytic two-parameter Šesták-Berggren (SB) reaction model (with kinetic exponents M=0.72 and N=1.02) describes well the studied process under the given conditions. The non-isothermal crystallization process involves the constant nucleation rate of stable nuclei with additional secondary two-dimensional (surface) nucleation and overlapping of the growing nuclei on account of the non-isothermal activation. 相似文献
3.
Vibration-rotation transitions of diacetylene between the first excited states of the ν6 (CCH symmetric bending) and the ν8 (CCH antisymmetric bending) vibrations were observed with a Stark modulation microwave spectrometer. The rotational, centrifugal distortion and l-type doubling constants of the two vibrational states were determined as follows with 2.5 σ uncertainties in parentheses.
4391.3230(84) | 0.582(154) | 2.4830(32) | ||||
4391.1921(94) | 0.594(179) | 2.4073(37) |
35ClO2 | 37ClO2 | |||||
945.592 357(60) | 939.602 909(66) | cm?1 | ||||
μ′ | 1.788 39(13) | 1.788 46(15) | D | |||
μ″ | 1.791 95(10) | 1.792 10(13) | D | |||
δμ | ?0.003 56(18) | ?0.003 64(26) | D |
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