Abstract
A new technique to study the Rydberg states of the barium atom has been developed. In this technique a multiphoton ionization signal is detected by selective excitation of the ground-state ion (6s) to an excited state (6p), which results in a collimated amplified spontaneous emission signal at the 6p → 5d transition of Ba+. Discrete Rydberg states, 6snl (l = 0, 2), as well as autoionizing Rydberg states, 5dnl (l = 0, 2) and 6pnl (l = 0, 2) are observed by this novel but simple method.
© 1988 Optical Society of America
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