One- and two-photon production of very highly excited states of caesium

van Raan AFJ, Baum G, Raith W (1976)
J.Phys. B 9(7): L173-L176.

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Very highly excited p states of Cs with principal quantum numbers 30 < or = Eta < or = 85 were produced by one-step photoexcitation with frequency-doubled light from a flash-lamp-pumped dye laser. Field ionization was employed for selective detection. Ionization occurs at field strengths E > or = Emin with a sharp threshold. The relation Emin(n*) varies as (n*)-4 was verified over a wide range. Two-photon excitation to a very high state via a virtual intermediate state leads to immediate ionization of most of the excited atoms; in this case the ion signal as a function of the light intensity I is not proportional to Ik, k > or = 2, whereas a direct two-photon transition into the continuum yields proportionality with Ito the power of 2.
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van Raan AFJ, Baum G, Raith W. One- and two-photon production of very highly excited states of caesium. J.Phys. B. 1976;9(7):L173-L176.
van Raan, A. F. J., Baum, G., & Raith, W. (1976). One- and two-photon production of very highly excited states of caesium. J.Phys. B, 9(7), L173-L176.
van Raan, A. F. J., Baum, G., and Raith, W. (1976). One- and two-photon production of very highly excited states of caesium. J.Phys. B 9, L173-L176.
van Raan, A.F.J., Baum, G., & Raith, W., 1976. One- and two-photon production of very highly excited states of caesium. J.Phys. B, 9(7), p L173-L176.
A.F.J. van Raan, G. Baum, and W. Raith, “One- and two-photon production of very highly excited states of caesium”, J.Phys. B, vol. 9, 1976, pp. L173-L176.
van Raan, A.F.J., Baum, G., Raith, W.: One- and two-photon production of very highly excited states of caesium. J.Phys. B. 9, L173-L176 (1976).
van Raan, A. F. J., Baum, Günter, and Raith, Wilhelm. “One- and two-photon production of very highly excited states of caesium”. J.Phys. B 9.7 (1976): L173-L176.
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