Measurement of the 1s-2s energy interval in muonium

• Published in: Physical review letters Vol. 84; no. 6; pp. 1136 - 1139
• Main Authors: 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
• Format: Journal Article
• Language: English
• Published: United States 07-02-2000
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.84.1136

The 1s-2s interval has been measured in the muonium ( (+)e(-)) atom by Doppler-free two-photon pulsed laser spectroscopy. The frequency separation of the states was determined to be 2 455 528 941.0(9.8) MHz, in good agreement with quantum electrodynamics. The result may be interpreted as a measurement of the muon-electron charge ratio as -1-1.1(2.1)x10(-9). We expect significantly higher accuracy at future high flux muon sources and from cw laser technology.