We introduce a new spectroscopic technique in which electron emission after optical excitation is measured with picosecond time resolution using a streak camera. By scanning the frequency of the exciting laser and measuring the electron flux in certain time gates, time-gated photoionization spectra are obtained. The technique is demonstrated for cesium Rydberg wave packets in an electric field of 1.0 kV/cm. The electron ejection probability is enhanced when the radial and angular oscillation periods of the excited wave packet are commensurable.

Additional Metadata
Journal Phys. Rev. Lett.
Citation
Lankhuijzen, G. M, Robicheaux, F, & Noordam, L. D. (1997). Time-gated photoionization spectroscopy demonstrated for cesium Rydberg wave packets in an electric field. Phys.Rev.Lett., 79, 2427–2430.