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  • Articles  (15)
  • 32  (15)
  • Springer  (15)
  • 1980-1984  (15)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (15)
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  • Articles  (15)
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  • Springer  (15)
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (15)
  • Physics  (31)
  • 1
    Electronic Resource
    Electronic Resource
    Laser cooling of trapped particles II (1981)
    Springer
    Applied physics 24 (1981), S. 71-84 
    Details
    ISSN: 1432-0630
    Keywords: 32 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We consider cooling of a trapped particle in the limit when the position and velocity variables do not change adiabatically. The slowly varying quantity in a harmonic trap is then the energy, and a representation based on oscillator eigenstates is used. For large excitation, fast particles, a Fokker-Planck expansion is obtained which is valid when our adiabatic description breaks down. Estimates of the initial cooling rate are given and compared with earlier results. Our treatment requires a large number of oscillator states to be coupled by each one-photon process, and in this limit the diffusion will make the expansion invalid towards the end of the cooling; our physical interpretation is that particles leak out of the trap. The opposite case, the Lamb-Dicke regime, is advantageous for cooling experiments, and then a difference equation replaces the Fokker-Planck equation of the present paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900402
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  • 2
    Electronic Resource
    Electronic Resource
    Frequency stability of a mercury ion frequency standard (1981)
    Springer
    Applied physics 24 (1981), S. 107-112 
    Details
    ISSN: 1432-0630
    Keywords: 06.30 F ; 32 ; 35 ; 52-55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Observation with an improved signal-to-noise ratio of the hyperfine resonance pattern of199Hg+ stored in a radiofrequency trap is reported. A frequency control loop which locks the frequency of a 5MHz quartz crystal oscillator to the hyperfine transition of stored mercury ions, close to 40.5 GHz, is described. In this system, pulses delivered by the photomultiplier are processed digitally. Optimal conditions for the interrogation of the hyperfine transition are specified. A fractional frequency stability σy(τ)=3.6×10−11τ−1/2 for 10s〈τ〈3500s has been obtained. This frequency stability is comparble to that of commercially available cesium beam frequency standards. Prospect for improvement by a factor of at least 10 are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902264
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  • 3
    Electronic Resource
    Electronic Resource
    Laser cooling of trapped particles I: The heavy particle limit (1980)
    Springer
    Applied physics 21 (1980), S. 283-291 
    Details
    ISSN: 1432-0630
    Keywords: 32 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We discuss laser cooling of a trapped ion. The problem is formulated for a harmonic trapping well and one-dimensional cooling. We carry out an adiabatic elimination and a Fokker-Planck expansion in the limit of a slowly oscillating particle. The ensuing Fokker-Planck equation is discussed and solved in certain limits. Especially the final cooling stages and ultimate width are of interest. The approach is related to earlier work and its validity is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886180
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  • 4
    Electronic Resource
    Electronic Resource
    Multi-photoelectron fluorescence selective detection of single atoms by laser radiation (1980)
    Springer
    Applied physics 22 (1980), S. 245-250 
    Details
    ISSN: 1432-0630
    Keywords: 07.65 ; 32
    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 results of fluorescence detection of single Na atoms in atomic beams have been presented. It has been shown that, in recording single atoms via the fluorescence signal from the photoelectron of thek〉1 atom, it is possible to achieve extremely high selectivity (S≃1020) of detection of these atoms against a great number of other atoms. The probability of recording the atom is slightly decreased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886015
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  • 5
    Electronic Resource
    Electronic Resource
    High-resolution optical spectra of laser cooled ions (1980)
    Springer
    Applied physics 22 (1980), S. 365-368 
    Details
    ISSN: 1432-0630
    Keywords: 32
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We obtain essentially Doppler free spectra of the naturally occuring isotopes of Mg+, which are bound in a Penning trap, by using a frequency stabilized laser to continuously cool the ions, while the scatter rate from a second, frequency swept laser is, monitored. We show that the magnetron motion as well as the cyclotron and axial motion can be minimized. Line position measurements yielding resonance transition energy, isotope and hyperfine shifts are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901058
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  • 6
    Electronic Resource
    Electronic Resource
    Broad band resonant light pressure (1980)
    Springer
    Applied physics 21 (1980), S. 35-45 
    Details
    ISSN: 1432-0630
    Keywords: 32 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper treats the mechanical pressure of resonant light acting on a two-level system, where the degenerate magnetic sublevels are taken into account. The theory is developed with arbitrary relations between the quantization axis and the propagation and polarization of the light. Rate terms are obtained both for spontaneous and induced transitions; the requirements of incoherence put restrictions on the possible geometries of the experiment. The rate equations are restricted to motion along a light beam only; this one-dimensional case is simpler to handle. For small recoil velocities a Fokker-Planck equation is derived, and an adiabatic elimination procedure enables us to derive an equation for the velocity distribution of the total population. The assumptions and approximations are formulated and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886481
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  • 7
    Electronic Resource
    Electronic Resource
    Light-pressure cooling of trapped ions in three dimensions (1980)
    Springer
    Applied physics 23 (1980), S. 175-182 
    Details
    ISSN: 1432-0630
    Keywords: 32 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We formulate a Fokker-Planck theory for the three-dimensional cooling of a trapped ion by means of a single laser beam. Both the steady state and the dynamics of the cooling are discussed, and the correlations between the vibrational modes due to the light pressure are elucidated. A few comments on the actual experiments are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899714
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  • 8
    Electronic Resource
    Electronic Resource
    Optical absorption resonances of trapped particles (1981)
    Springer
    Applied physics 25 (1981), S. 81-86 
    Details
    ISSN: 1432-0630
    Keywords: 32
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have previously shown the possibility of the existence of a one-photon resonance with homogeneous width in the center of an absorption line of trapped particles. The results of a detailed investigation of this resonance are given in the first part of the present paper. The second part is devoted to a two-photon resonance in a standing-wave field: the time of coherent interaction with the field is increased for trapped particles, which permits the elimination of transit resonance broadening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935396
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  • 9
    Electronic Resource
    Electronic Resource
    The scattering of slow atoms by light (1981)
    Springer
    Applied physics 25 (1981), S. 165-167 
    Details
    ISSN: 1432-0630
    Keywords: 32
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A kinetic equation has been obtained describing the motion of atoms in a resonant field of standing light wave. This equation is used to describe the scattering of atoms for conditions close to experimental ones [1]. It is shown that the dependence of atomic scattering has a dip at the resonance frequency of the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901291
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  • 10
    Electronic Resource
    Electronic Resource
    Separation of atomic beams by light pressure (1980)
    Springer
    Applied physics 21 (1980), S. 263-269 
    Details
    ISSN: 1432-0630
    Keywords: 32
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We calculate the separation efficiency for an isotope-separation setup utilizing atomic beam deflection by light. The theory is based on the notion of the light-pressure force with due inclusion of the metastable states. The theory and the existing experimental results are compared, and the approximations are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886177
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