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  • American Institute of Physics (AIP)  (2)
  • 1995-1999  (2)
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Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Infrared laser spectroscopy of the A 2Πu←X 2Σ+g system of the Si−2 anion (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 3443-3449 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two bands of the A 2Πu←X 2Σ+g transition of Si−2 lying in the mid-infrared region have been detected using diode laser velocity modulation spectroscopy. The anion was generated in an air cooled low pressure ac discharge through mixtures of silane and hydrogen, and 130 lines of the (1,0) and (2,0) bands lying between 670 and 810 cm−1 and 1200 to 1340 cm−1 respectively were measured and assigned. A fit to standard Hamiltonians for 2Σ and 2Π states yielded the most precise spectroscopic constants so far obtained for the anion. These have been used to derive several equilibrium parameters for the A state. The equilibrium internuclear distance of the A state is re=2.182986(16) A(ring). The fine structure and equilibrium parameters are compared with earlier low resolution results and with ab initio calculations on Si−2. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472214
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared laser absorption spectroscopy of rotational and vibration rotational transitions of HeH+ up to the dissociation threshold (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 337-341 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Many high J pure rotational transitions of 4HeH+ up to the dissociation threshold have been measured by infrared diode laser absorption spectroscopy between 590 and 920 cm−1 in an air cooled H2/He discharge. Additional centrifugal distortion terms up to J12 have been included in the rotational Hamiltonian to fit these transitions. Ten new vibration rotational transitions have also been detected in the same spectral region, arising from both low (v=1,2) and high (v=4–7) vibrational states. Some of the transitions involving high v (v=6,7) are observed as stimulated emission signals. The measured rotational transitions are in excellent agreement with ab initio calculations based on the form of the adiabatic potential model developed by Fournier and Richard. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474394
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