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  • 1990-1994  (2)
  • 32.70. Fw  (1)
  • 32.80.Pj  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Laser cooling of a small number of Be+ ions in a penning trap (1993)
    Springer
    Applied physics 57 (1993), S. 141-144 
    Details
    ISSN: 1432-0649
    Keywords: 32.80.Pj ; 05.70.Fh ; 34.40.+n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Be+ ions stored in a Penning trap were cooled by a laser beam perpendicular to the magnetic field. The cooled ions are strongly coupled and phase transitions of up to 100 ions were observed. In experiments with only a few ions stored in the trap, a stepwise decrease in fluorescence intensity was observed. All steps are of the same size and so every step is attributed to a single ion. The discrete changes in fluorescence occurred more frequently when the background pressure was increased, caused by collisions between stored ions and background neutral molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425998
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Laser cooling of a single Ca+ ion: Observation of quantum jumps (1993)
    Springer
    Applied physics 57 (1993), S. 367-371 
    Details
    ISSN: 1432-0649
    Keywords: 32.80. Pj ; 32.70. Fw ; 34.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes trapping and laser cooling of a Ca+ ion in an rf quadrupole ion trap. A single Ca+ ion is laser cooled to below 130 mK and quantum jumps are observed by exciting the ion into the metastable D 5/2 state via the P 3/2 state. The lifetime of the metastable D 5/2 state is estimated from the distribution of the dark periods of the quantum-jump signal. Collision-induced jumps between the metastable D 3/2 state and the D 5/2 state in a background gas are also directly observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332462
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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