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  • 35.10.F  (4)
  • 32.70.Fw  (1)
  • Circulation  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Spectroscopy and dynamics of neutral atoms in superfluid helium (1995)
    Springer
    The European physical journal 98 (1995), S. 353-357 
    Details
    ISSN: 1434-6036
    Schlagwort(e): 32.30.Jc ; 32.70.Fw ; 67.40.Yv
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Optical spectra and radiative lifetimes of neutral atoms in superfluid helium have been studied. The absorption and emission spectra of Ag, Mg, Yb, Al, Ga, and In were found to exhibit shifts and broadening typical of atoms residing in microscopic He bubbles, showing that this type of trapping is fairly general. The radiative lifetimes measured for these atoms are close to the free space values, indicating that the surrounding bubble hardly perturbs the electronic orbitals during photo emission. One exception observed in Sr is discussed, where competing autoionization substantially decreases the lifetime of a high excited triplet state. A transient non-bubble state with sharp, free atom like spectra is seen during the first few μs after dispersion for many atomic species. The dynamics of this state are unusual, with for example very short radiative lifetimes measured for light alkali atoms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01338404
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  • 2
    Digitale Medien
    Digitale Medien
    Physiological and psychological indices of fatigue during static contractions (1983)
    Springer
    European journal of applied physiology 50 (1983), S. 179-193 
    Details
    ISSN: 1439-6327
    Schlagwort(e): Static exercise ; Fatigue ; Electromyography ; Circulation ; Perceived effort
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The development of fatigue and the relationship between psychological and physiological indices of fatigue were studied in a group of 18 male subjects during static contractions. Exercise was performed as a static elbow flexion at 25% MVC. Heart rate (HR), intraarterial blood pressure (BP) and surface EMG [mean amplitude (MA) and central frequency (CF)] were studied during contractions sustained until exhaustion. The amount of effort expended (relative to total exhaustion) and the rating of perceived pain were recorded following contractions interrupted after 20, 30 ⋯ 80, and 100% of endurance time. HR, BP and EMG amplitude responses were similar to those previously recorded. The decline in CF occurred in two phases, possibly related to a change in motor unit recruitment after the initial 70% of endurance time. The subjects overestimated the amount of effort expended and thus underestimated their endurance capacity. The best correlation between perceived effort and physiological responses was obtained using blood pressure data, whereas changes in EMG data did not parallell the psychological responses. It is concluded that the perception of effort during a static contraction is produced through a complex process, in which several influences of peripheral and central origin are integrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00422157
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  • 3
    Digitale Medien
    Digitale Medien
    Laser and radiofrequency spectroscopy of the 5d 4 6s 6 D multiplet in Ta I (1993)
    Springer
    The European physical journal 27 (1993), S. 155-158 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 35.10.F ; 32.30.B ; 32.30.J
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The hyperfine structure (hfs) of181Ta has been investigated using laser radio-frequency double resonance and high resolution laser spectroscopy on collimated atomic beams. The magnetic dipole and electric quadrupole hyperfine structure coupling constants of the 5d 4 6 s 6D 3/2, 5/2, 7/2, 9/2 metastable states have been determined using radio-frequency spectroscopy. In the 5d 4 6s 6 D 1/2 metastable state and the excited 5d 3 6s 6p 4 D 3/2,6 D 5/2, 9/2 as well as the unidentified 28 182.6 cm−1 and 30 021.2 cm−1 states, hfs constants have been obtained from high resolution laser spectroscopy. A radio-frequency converter has been developed in order to reach the frequency region 2.7–10 GHz.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01426763
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  • 4
    Digitale Medien
    Digitale Medien
    Laser and radio-frequency spectroscopy of the 5d 36s 2 4 P 3/2,5/2 states in Ta I (1992)
    Springer
    The European physical journal 23 (1992), S. 67-70 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 35.10.F ; 32.30.B ; 32.30.J
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The hyperfine structure of the metastable atomic states 5d 36s 2 4 P 3/2 and4 P 5/2 in181Ta has been studied using high resolution laser spectroscopy and laser radio-frequency double-resonance methods.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01436704
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  • 5
    Digitale Medien
    Digitale Medien
    Hyperfine structure measurements of93Nb (1988)
    Springer
    The European physical journal 8 (1988), S. 171-176 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 35.10.F ; 32.30.B ; 32.30.J
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Laser and radiofrequency spectroscopy have been employed in order to measure the hyperfine structure in93Nb. We report the hyperfine structure splittings of 17 metastable states in the 4d 45s, 4d 35s 2 and 4d 5 configurations and of 14 states in the higher lying configurations 4d 45p and 4d 35s5p.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01384510
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  • 6
    Digitale Medien
    Digitale Medien
    Parameterization of the hyperfine structure of metastable states in103Rh (1989)
    Springer
    The European physical journal 14 (1989), S. 139-142 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 35.10.F ; 31.30.G
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The experimental data on the hyperfine structure of metastable even parity states in103Rh have been analysed by means of an effective-operator formalism. The effective radial parameters of the magnetic dipole interaction are determined, using wave functions in intermediate coupling. The comparison with relativistic calculations gives an estimate of the effects due to configuration interaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01399035
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