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Helium Rydberg states have been excited from the metastable 2 1S and 2 3S states in the presence of an external electric or magnetic field. States around n = 100 were studied by Doppler-free UV laser spectroscopy. In the excitation process the external field was adjusted on-line to keep the scaled energy ε. which determines the classical dynamics of the system, constant.
© 1998 IEEE
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