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  • 1975-1979  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Atomic beam measurement of the lifetime of the3 P 1 metastable states of Mg and Ca (1975)
    Springer
    The European physical journal 274 (1975), S. 279-287 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The lifetime of the metastable level3 P 1 of Mg and Ca have been measured in an atomic beam experiment. We excite the atoms to the3 P 1 state by electron collisions and we measure the decay length of the light emitted by the beam. The velocity distribution of the atoms is also measured by a time-of-flight technique. The decay length and the velocity measurements are then combined to compute the required lifetimes. The results are (2.4±0.2)×10−3 sec for Mg and (0.55±0.04)×10−3 sec for Ca.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01434037
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stark effect on CH3OH and CH3F FIR lasers: Large frequency tuning and resolved structures (1979)
    Springer
    Applied physics 18 (1979), S. 261-270 
    Details
    ISSN: 1432-0630
    Keywords: 42.55H ; 33.60 ; 06.30F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The operation of a cw FIR laser in the presence of a strong electric field is described. A hybrid metal-dielectric waveguide is used and the cavity length is scanned to study how the frequency and power of the laser depend on the field strength. The results have also been checked by heterodyning with a conventional reference laser. We report the results obtained for the 496 μm line of CH3F and the 70.5 μm and 119 μm lines of CH3OH. A large frequency tunability of almost ±40 MHz is obtained in the best case with power levels in the mW range. A very simple theoretical model accounts for the experimental results. We also report the appearance of a new FIR line at about 204 μm when CH3OH is pumped by the 9 μmP(34) of CO2 in the presence of an electric field larger than 1.2 KV/cm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885512
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On the possibility of submillimetric interstellar lines detection by means of laser heterodyne techniques (1979)
    Springer
    Astrophysics and space science 60 (1979), S. 475-491 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The search for extraterrestrial and, in particular, interstellar molecules has suddenly increased in the last ten years after the discovery of many complex organic molecules by radioastronomy. Since some very interesting lines are not detectable in the radio region, but only in the middle and far infrared, heterodyne techniques seem to be a powerful tool for interstellar line detection in the submillimetric region and the detection of CO at 870 μ in Orion (Philipps and Huggins, 1977) represents an encouraging success for further efforts in this new field of research. In this work the possibility of observing interstellar lines at heterodyne laser wavelengths already available in laboratory has been considered. We also computed relative intensities for some representative rotational lines of interstellar molecules at three typical temperatures (10, 20, 50 K) assuming thermodynamic equilibrium and optically thin regions. The results achieved with heterodyne laser techniques developed in the laboratory are discussed here in order to study the possibility for ground and space astronomical observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644347
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    Paper (German National Licenses)
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