Measurement of the 1s-2s energy interval in muonium.
Meyer V V, Bagayev SN, Baird PE, Bakule P, Boshier MG, Breitruck A, Cornish SL, Dychkov S, Eaton GH, Grossmann A, Hubl D, Hughes VW, Jungmann K, Lane IC, Liu YW, Lucas D, Matyugin Y, Merkel J, zu Putlitz G, Reinhard I I, Sandars PG, Santra R, Schmidt PV, Scott CA, Toner WT, Towrie M.
Meyer V V, et al.
Phys Rev Lett. 2000 Feb 7;84(6):1136-9. doi: 10.1103/PhysRevLett.84.1136.
Phys Rev Lett. 2000.
PMID: 11017462