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  • 1985-1989  (2)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    High-temperature Stark and radio-frequency–microwave double-resonance microwave spectrometer (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 979-984 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high-temperature microwave spectrometer has been constructed for the study of hot corrosive gases. The absorption cell consists of a 213-cm X-band copper waveguide which is heated along roughly 130 cm of its length. A thin nickel strip held taut by stainless-steel posts at either end of the waveguide serves as the Stark septum. The sample chamber is coupled to the Stark cell midway along its length by a slip joint formed from two concentric tubes. This design ensures a long effective absorption path length and minimizes sample consumption. The hot cell is used in conjunction with an HP 8400C microwave spectrometer source which has been interfaced to a small computer for data acquisition, storage, and retrieval. The successful operation of the spectrometer has been demonstrated with KOH vapor at 580 °C. The J=2←1 transitions of a number of vibrational states of monomeric KOH have been observed in the region of 32.8 GHz. The observed signal-to-noise ratio of these transitions indicates that the sensitivity compares favorably to spectrometers which have been used to observe higher J transitions in the submillimeter region. Radio-frequency–microwave double resonance techniques have been demonstrated for the first time in a high-temperature Stark cell by observing the J=2←1 l-doublet transitions in the (011O) state of KOH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139586
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear quadrupole structure of potassium hydroxide in the 32 GHz microwave region (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3706-3707 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A high temperature Stark and radiofrequency-microwave double resonance spectrometer was used to observe the nuclear quadrupole structure of the J=2←1 transition of 39KOH in a number of vibrational states. First order analysis of the hyperfine components gave nuclear quadrupole coupling constants of eQq=−7.23 (29) MHz for the (0000) state, eQq=−7.16 (33) MHz for the (1000) state, and eQq=−7.29 (37) MHz for the (0110) state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452973
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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