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  • 35  (2)
  • 35.10.Di  (2)
  • 07.77  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Temperature dependence of slow-positron production and of positronium formation on untreated surfaces (1987)
    Springer
    Applied physics 44 (1987), S. 105-106 
    Details
    ISSN: 1432-0630
    Keywords: 07.77 ; 29.25
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Low-energy positron emission from tungsten moderators, placed at a electron accelerator beam stop slows down with increasing moderator temperature. Efficient positronium formation is reported on untreated and unoriented metal surfaces at higher target temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626408
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic hyperfine spectrum of isolated (199Hg)+ Ions (1978)
    Springer
    Applied physics 15 (1978), S. 201-208 
    Details
    ISSN: 1432-0630
    Keywords: 32 ; 35
    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 (199Hg)+ ions were stored in an RF quadrupole electric field and their ground state hyperfine populations pumped optically using the ion resonance radiation at 1942 Å from a (202Hg) isotope enriched lamp. A microwave field at 40.5 GHz was phase-locked to the 1350th harmonic of the output of a frequency synthesizer, referenced to a Cs-beam frequency standard. Using a digital averager, a high background suppression optical system monitored the fluorescence light from the ions. Linewidths on the order of 3 Hz were observed for the “field-independent” 0-0 transition, and a value of 40, 507, 348, 051±50 Hz was deduced for the magnetic hyperfine interval, corrected to zero magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928209
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  • 3
    Electronic Resource
    Electronic Resource
    Trapped ion density distribution in the presence of He-buffer gas (1981)
    Springer
    Applied physics 25 (1981), S. 249-251 
    Details
    ISSN: 1432-0630
    Keywords: 35
    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 spatial density distribution of Ba+ ions, confined in a rf quadrupole trap, has been measured by laser scanning across the trap. This allows to determine the ion temperature, assuming thermal equilibrium. Under UHV conditions the average ion energy has been found to be one tenth of the trap potential well depth. Collisions with He at pressures up to 5×10−6 mbar reduce the ion temperature by a factor of 3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902978
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental ground stateg J-factor of Ba+ in a Penning ion trap (1993)
    Springer
    The European physical journal 25 (1993), S. 205-208 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.Bx ; 32.60.+i ; 35.10.Di
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We observed the Zeeman-splitting of the 6S 1/2 – 6P 1/2 resonance transition of Ba+-ions (493.4 nm) in a 6T magnetic field. The ions were stored in a Penning quadrupole trap. We polarized the ground state by optical pumping and in a microwave-optical double resonance experiment we measured the ground state Zeeman-splitting. From the resonance frequency and the cyclotron frequency of electrons stored in the same trap we derived theg-factor of the 6S 1/2 state. The result isg J(6S 1/2)=2.002 490 6(11), in reasonable agreement with recent calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426881
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  • 5
    Electronic Resource
    Electronic Resource
    Ground- and excited stateg-factors of Ba+ (1991)
    Springer
    The European physical journal 18 (1991), S. 113-115 
    Details
    ISSN: 1434-6079
    Keywords: 35.10.Di ; 32.30.Dx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We observed the Zeeman-splitting of the 6S 1/2-6P 1/2 resonance transition of Ba+ ions (493.4 nm) in a 6 T magnetic field. The ions were stored in a Penning quadrupole trap. From the splitting and the simultaneously measured cyclotron frequency of stored electrons we derived theg-factors of the 6S 1/2 and 6P 1/2 states. The results areg(6S 1/2)=2.00267(20) andg(6P 1/2)=0.66634(22).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418176
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