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[en] A CO2-pumped far-infrared (FIR) laser has been used to drive transitions between S and P levels of 4He Rydberg states with the same principal quantum number (n). The level are tuned to resonance with the fixed-frequency FIR laser through application of an intense magnetic field. Measurements of such transitions are particularly valuable as they provide high-resolutiion data for low L states, a previously ill-difined area in the otherwise well-known energy-level structure of 4He
Journal
Optics Letters; ISSN 0146-9592; 
; v. 6(2); p. 99-101
; v. 6(2); p. 99-101