Castro, Jarbas C.Zimmerman, Myron L.Hulet, Randall G.Kleppner, DanielFreeman, Richard R.2015-03-302015-03-301980Castro, Jarbas C., Zimmerman, Myron L., Hulet, Randall G., et al.. "Origin and Structure of the Quasi-Landau Resonances." <i>Physical Review Letters,</i> 45, no. 22 (1980) American Physical Society: 1780-1783. http://dx.doi.org/10.1103/PhysRevLett.45.1780.https://hdl.handle.net/1911/79431Highly resolved spectra are presented which show how the low-magnetic-field energy-level structure of a single-electron atom gives rise to the quasi-Landau resonances as the field is increased. Data from the strong-mixing region where electric and magnetic forces are comparable reveal that evenly spaced energy levels are a general feature, irrespective of parity and magnetic quantum number of the states. The quasi-Landau resonances emerge by a concentration of oscillator strength into a single level of each term.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevLett.45.1780