Polarization transfer in ion-surface scattering

n dit proefschrift wordt deze wisselwerking onderzocht door de emissiepatronen van fotonen en elektronen, onstaan door de interactie van ionen met o.a. spin-gepolariseerde oppervlakken, te meten. Vanuit atoomfysische experimenten is namelijk bekend dat de elektronenspin behouden blijft tijdens elektronenoverdracht. De verwachting is dus dat de spinpolarisatie van de elektronen in het oppervlak wordt overgedragen op het projectiel. ... Zie: Samenvatting

New test of modulated electron capture decay of hydrogen-like ¹⁴²Pm ions: Precision measurement of purely exponential decay

An experiment addressing electron capture (EC) decay of hydrogen-like 142Pm60+ions has been conducted at the experimental storage ring (ESR) at GSI. The decay appears to be purely exponential and no modulations were observed. Decay times for about 9000 individual EC decays have been measured by applying the single-ion decay spectroscopy method. Both visually and automatically analysed data can be described by a single exponential decay with decay constants of 0.0126(7)s−1 for automatic analysis and 0.0141(7)s−1 for manual analysis. If a modulation superimposed on the exponential decay curve is assumed, the best fit gives a modulation amplitude of merely 0.019(15), which is compatible with zero and by 4.9 standard deviations smaller than in the original observation which had an amplitude of 0.23(4)