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Digitale Medien

Laser cooling of a small number of Be+ ions in a penning trap (1993)

Imajo, H. ; Urabe, S. ; Hayasaka, K. ; [weitere]

Springer

Applied physics 57 (1993), S. 141-144

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ISSN: 1432-0649

Schlagwort(e): 32.80.Pj ; 05.70.Fh ; 34.40.+n

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00425998

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Digitale Medien

Observation of laser-cooled Be+ -ion clouds in a Penning trap (1995)

Imajo, H. ; Hayasaka, K. ; Ohmukai, R. ; [weitere]

Springer

Applied physics 61 (1995), S. 285-289

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ISSN: 1432-0649

Schlagwort(e): 32.80.Pj ; 05.70.Fh

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Be+ ions trapped in a Penning trap are laser-cooled to about 10 mK. The excitation spectra of ion clouds containing about 500 ions are obtained by scanning the frequency of the cooling laser and discontinuities in these spectra are observed because of phase transitions. When the cooled ions are heated electrically by applying an rf voltage, no phase transition occurs and the spectra become continuous. Two-dimensional measurement of the ion clouds is carried out and the abrupt change in the shape of the ion cloud due to the phase transition is observed. When many ions are trapped and cooled, the phase transition occurs partially and a transient state where two states are mixed can be observed. The static properties of the ions are also measured by using an additional probe laser and the results of experimental measurements are compared with theoretical predictions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01082048

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Digitale Medien

Generation of continuous-wave coherent radiation tunable down to 190.8nm in β-BaB2O4 (1991)

Watanabe, M. ; Hayasaka, K. ; Imajo, H. ; [weitere]

Springer

Applied physics 53 (1991), S. 11-13

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ISSN: 1432-0649

Schlagwort(e): 42.65.Cq

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Continuous-wave coherent radiation tunable in the wavelength range 190.8–196.1 nm has been generated by sum-frequency generation in β-BaB2O4. The fundamental beams were supplied by a Ti:Al2O3 laser and a frequency-doubled argon-ion laser.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00325475

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Digitale Medien

Difficulties in assessing the effect of strychnine on the outcome of non-ketotic hyperglycinaemia. Observations on sisters with a mild T-protein defect (1986)

Haan, E. A. ; Kirby, D. M. ; Tada, K. ; [weitere]

Springer

European journal of pediatrics 145 (1986), S. 267-270

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ISSN: 1432-1076

Schlagwort(e): Non-ketotic hyperglycinaemia ; Strychnine ; Glycine cleavage system

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract Sisters with a mild variant of non-ketotic hyperglycinaemia resulting from a defect in the T-protein of the glycine cleavage system had different clinical outcomes. The older sister was ascertained at 6 months of age because of mental retardation. She received only brief treatment with sodium benzoate from 11–15 months and at 15 years of age is profoundly retarded and has epilepsy. The younger sister was diagnosed 36h after birth, was treated with strychnine, sodium benzoate and arginine from the neonatal period and at 27 months of age is only moderately retarded and free of seizures. The possible role of strychnine in the improved outcome is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00439398

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