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Optics Letters

Optics Letters


  • Vol. 3, Iss. 4 — Oct. 1, 1978
  • pp: 156–158

Associative ionization of laser-excited Rydberg states in strontium vapor

E. F. Worden, J. A. Paisner, and J. G. Conway  »View Author Affiliations

Optics Letters, Vol. 3, Issue 4, pp. 156-158 (1978)

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Using mass spectrometry we have confirmed that Sr2+ ions are produced from laser-populated Rydberg states by the associative ionization process Sr(5snl) + Sr(5s2) → Sr2+ + e. Dimer ion signal was detected for the 5s6d3D2 level, indicating that the binding energy of Sr2+ exceeds 0.77 eV. We have observed that under certain conditions the Rydberg states are destroyed by electron-impact ionization before an associative ionization collision can occur.

© 1978 Optical Society of America

Original Manuscript: July 10, 1978
Published: October 1, 1978

E. F. Worden, J. G. Conway, and J. A. Paisner, "Associative ionization of laser-excited Rydberg states in strontium vapor," Opt. Lett. 3, 156-158 (1978)

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  1. F. L. Arnot, M. B. M’Ewen, “The formation of helium molecules,” Proc. R. Soc. (London) A 166, 543–551 (1938); “The formation of helium molecules II,” Proc. R. Soc. (London) A 171, 106–120 (1939). [CrossRef]
  2. J. A. Hornbeck, J. P. Molnar, “Mass spectrometric studies of molecular ions in the noble gases,” Phys. Rev. 84, 621 (1951). [CrossRef]
  3. F. L. Mohler, C. Boeckner, “Photoionization of cesium by line absorption,” J. Res. Nat. Bur. Stand. (U.S.) 5, 51–71 (1930).
  4. A. Fontijn, “Recent progress in chemi-ionization kinetics,” Pure Appl. Chem. 39, 287–306 (1974); AeroChem Research Laboratories, Princeton, N.J., personal communication (1977). [CrossRef]
  5. R. W. Solarz, C. A. May, L. R. Carlson, E. F. Worden, S. A. Johnson, J. A. Paisner, L. J. Radziemski, “Detection of Rydberg states in uranium using time resolved stepwise laser photoionization,” Phys. Rev. A 14, 1129–1136 (1976); E. F. Worden, R. W. Solarz, J. A. Paisner, J. G. Conway, “First ionization potentials of lanthanides by laser spectroscopy,” J. Opt. Soc. Am. 68, 52–61 (1978). [CrossRef]
  6. W. Gornik, “Lifetime measurements of highly excited levels of Sr i using stepwise excitation by two pulsed dye lasers,” Z. Phys. A 283, 231–234 (1977). [CrossRef]
  7. P. Esherick, “Bound, even parity J = 0 and J = 2 spectra of Sr,” Phys. Rev. A 15, 1920–1936 (1977); Sandia Laboratories, Albuquerque, N.M., personal communication (1977). [CrossRef]
  8. We have also observed associative ionization for the 5snp1P1 series using the three-step excitation process:Sr(5s S210)→λ1Sr(5s5pP31)→λ2Sr(5s6sS31)→λ3Sr(5snpP1).The investigation was less extensive than for the ns and nd series.
  9. B. Liu, R. E. Olson, “Potential energies and scattering cross sections for Ca+ + Ca,” Phys. Rev. A (to be published).
  10. W. E. Cooke, T. F. Gallagher, S. A. Edelstein, R. M. Hill, “Doubly exited autoionizing Rydberg states of Sr,” Phys. Rev. Lett. 40, 178–181 (1978). [CrossRef]
  11. I. C. Percival, “Cross sections for collisions of electrons with hydrogen atoms and hydrogen-like ions,” Nucl. Fusion 6, 182–187 (1966). [CrossRef]
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  13. J.-F. Delpech, J. Boulmer, F. Devos, “Transitions between Rydberg levels of helium induced by electron collisions,” Phys. Rev. Lett. 39, 1400–1403 (1977). [CrossRef]
  14. J. S. Deech, R. Luypaert, L. R. Pendril, G. W. Series, “Lifetimes, depopulating cross sections and hyperfine structures of some Rydberg S and D states of 133Cs,” J. Phys. B 10, L137–L141 (1977). [CrossRef]
  15. W. E. Cooke, SRI International, Menlo Park, California, private communication (May1978).
  16. See, for example, J. Reif, H. Walther “Generation of tunable 16 μm radiation by stimulated hyper-Raman effect in strontium vapor,” Appl. Phys. 15, 361–364 (1978); J. J. Wynne, P. P. Sorokin, “Optically pumped stimulated emission and stimulated electronic Raman scattering from K atoms,” J. Phys. B 8, L37–L41 (1975); A. M. F. Lau, W. K. Bischel, C. K. Rhodes, R. M. Hill, “Optical frequency conversion processes in atomic Rydberg states,” Appl. Phys. Lett. 24, 245–247 (1976); T. W. Ducas, M. G. Littman, R. R. Freeman, D. Kleppner, “Stark ionization of high-lying states of sodium,” Phys. Rev. Lett. 35, 366–369 (1975). [CrossRef]

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