Autoionization Inhibited by Internal Interferences

J. Neukammer; H. Rinneberg; G. Jönsson; W. E. Cooke; H. Hieronymus; A. König; K. Vietzke; H. Spinger-Bolk

doi:10.1103/PhysRevLett.55.1979

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Autoionization Inhibited by Internal Interferences

J. Neukammer, H. Rinneberg, G. Jönsson^*, W. E. Cooke^†, H. Hieronymus, A. König, and K. Vietzke

H. Spinger-Bolk

Institut für Atom- und Festkörperphysik, Freie Universität Berlin, D-1000 Berlin 33, West Germany

Coherent GmbH, Rödermark, West Germany

^*Permanent address: Lund Institute of Technology, S-221000, Lund, Sweden.
^†Permanent address: Physics Department, University of Southern California, Los Angeles, Cal. 90089.

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Phys. Rev. Lett. 55, 1979 – Published 4 November, 1985

DOI: https://doi.org/10.1103/PhysRevLett.55.1979

Abstract

We have measured the linewidths of ${[5 d_{\frac{3}{2}} n_{2} d_{\frac{3}{2}}]}_{J = 0}$ autoionizing Rydberg states of barium with principal quantum numbers ranging between $n_{2} = 14$ and $n_{2} = 100$ . Dramatic deviations of the autoionization rates from the normal $n_{2}^{* - 3}$ scaling law have been observed. Whereas the ${[5 d_{\frac{3}{2}} 60 d_{\frac{3}{2}}]}_{J = 0}$ level exhibits a linewidth $Γ$ (FWMH) as low as 6 MHz, higher ( $n_{2} \approx 80$ ) members of this series are broadened up to 5 GHz. Autoionization is inhibited for principal quantum numbers $n_{2} \approx 60$ because of configuration interaction between the ${[5 d_{\frac{3}{2}} n_{2} d_{\frac{3}{2}}]}_{J = 0}$ and ${[5 d_{\frac{5}{2}} n_{3} d_{\frac{5}{2}}]}_{J = 0}$ Rydberg series. This causes the state at $n_{2} = 60$ to be metastable.

References (12)

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[c1] S. E. Harris, R. G. Caro, R. W. Falcone, D. E. Holmgren, J. E. Rothenberg, D. J. Walker, J. C. Wang, J. R. Willison, and J. F. Young, in Atomic Physics 9, edited by R. S. van Dyck, Jr. and E. N. Fortson (World Scientific, Singapore, 1984), p. 462

[c2] P. Feldman and R. Novick, Phys. Rev. Lett. 11, 278 (1963)

[c3] E. J. McGuire, Phys. Rev. A 14, 1402 (1976)

[c4] P. Lambropoulos and P. Zoller, Phys. Rev. A 24, 379 (1981) K. Rzazewski and J. H. Eberly, Phys. Rev. Lett. 47, 408 (1981)

[c5] H. Friedrich and D. Wintgen, Phys. Rev. A 31, 3964 (1985)

[c6] J.-Y. Liu, P. McNicholl, D. A. Harmin, J. Ivri, T. Bergeman, and H. J. Metcalf, Phys. Rev. Lett. 55, 189 (1985)

[c7] E. B. Saloman, J. W. Cooper, and D. E. Kelleher, Phys. Rev. Lett. 55, 193 (1985)

[c8] M. J. Seaton, Rep. Prog. Phys. 46, 167 (1983)

[c9] U. Fano, Phys. Rev. A 2, 353 (1970)

[c10] J. P. Connerade, A. M. Lane, and M. A. Baig, J. Phys. B (to be published)

[c11] W. E. Cooke and C. L. Cromer, Phys. Rev. A (to be published)

[c12] M. Aymar, P. Camus, and A. El Himdy, J. Phys. B 15, L759 (1982)

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Autoionization Inhibited by Internal Interferences

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