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https://arxiv.org/abs/physics/0212112 [physics/0212112] A Search for Variations of Fundamental Constants using Atomic Fountain Clocks Abstract page for arXiv paper physics/0212112: A Search for Variations of Fundamental Constants using Atomic Fountain Clocks search for fundamental constants atomic fountain physics variations https://research.ibm.com/publications/rf-spectroscopy-in-an-atomic-fountain Rf spectroscopy in an atomic fountain for Physical Review Letters - IBM Research Rf spectroscopy in an atomic fountain for Physical Review Letters by Mark A. Kasevich et al. physical review letters in an atomic fountain ibm research spectroscopy