Microwave Spectroscopy of the Muonium $2S_{1/2}-2P_{3/2}$ Fine Structure Interval
Philipp Blumer, Gianluca Janka, Svenja Geissmann, Iren Ignatov, Marcus Mähring, Zaher Salman, Andreas Suter, Edward Thorpe-Woods, Thomas Prokscha, Ben Ohayon, Paolo Crivelli