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Laser spectroscopic studies on minute samples of exotic radioactive nucleirequire very efficient experimental techniques. In addition, high resolvingpowers are required to allow extraction of nu- clear structure information.Here we demonstrate that by using weak atomic transitions, resonance laserionization spectroscopy is achieved with the required high efficiency (1-10%)and precision (linewidths of tens of MHz). We illustrate experimentally andthrough the use of simulations how the narrow experimental linewidths areachieved and how distorted resonance ionization spec- troscopy lineshapes canbe avoided. The role of the delay of the ionization laser pulse with respect tothe excitation laser pulse is crucial: the use of a delayed ionization steppermits the best resolving powers and lineshapes. A high efficiency ismaintained if the intermediate level has a lifetime that is at least of theorder of the excitation laser pulse width. A model that describes this processre- produces well the observed features and will help to optimize theconditions for future experiments.

Efficient, high-resolution resonance laser ionization spectroscopy using weak transitions to long-lived excited states