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An atomic fountain is a neutral atomic trap that measures an atomic hyperfine transition by pushing a cloud of laser-cooled atoms vertically and allowing them to fall through an interaction region under the influence of gravity. The atomic cloud is cooled and pushed upwards by counter-propagating lasers in an optical molasses configuration.
The atomic transition is measured precisely with coherent microwaves while the atoms pass through the interaction region. The measured transition can be used in an atomic clock measurement to high precision.
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Search interest data over the past 12 months indicates that this topic periodically attracts global attention. Sudden spikes often correlate with major news events, public statements, or geopolitical developments.