Multiphoton Ionization Spectroscopy Of Alkaline Earth Atoms

P. Esherick; J. J. Wynne; J. A. Armstrong

doi:10.1117/12.955609

5 December 1977 Multiphoton Ionization Spectroscopy Of Alkaline Earth Atoms

P. Esherick, J. J. Wynne, J. A. Armstrong

Proceedings Volume 0113, Advances in Laser Spectroscopy I; (1977) https://doi.org/10.1117/12.955609
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

By using multiphoton ionization spectroscopy, hundreds of previously unobserved states have been identified in the alkaline earth atoms Ca, Sr and Ba. In this technique, pulsed, tunable dye lasers are focused into a pipe containing the atomic vapor. A simple wire probe, inserted into the hot vapor, readily detects ions produced as a result of the multiphoton excitation. Excitation spectra from various well-defined initial states are obtained by re-cording the ion signal as a function of laser wavelength. In a single laser experiment, one obtains the two-photon excitation spectrum from the ¹S₀ ground state of the alkaline earths, to the Rydberg series of bound even-parity ¹S₀, ¹D₂ and ³D₂ states, most of which have not previously been identified by conventional spectroscopy. In a two-laser version of this experiment, we have made the first observation of Rydberg series of even-parity auto-onizing states. In a three laser variation the excitation spectrum from the first excited ³S₁ levels (of Ca, Sr and Ba) reveals the ³P⁰ Rydberg series. Since transitions from the ¹S₀ ground state to these series are spin-forbidden, they have not previously been seen in absorption spectra.

Citation Download Citation

P. Esherick, J. J. Wynne, and J. A. Armstrong "Multiphoton Ionization Spectroscopy Of Alkaline Earth Atoms", Proc. SPIE 0113, Advances in Laser Spectroscopy I, (5 December 1977); https://doi.org/10.1117/12.955609

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