Multiphoton ionization of rubidium

C. B. Collins, S. M. Curry, B. W. Johnson, M. Y. Mirza, M. A. Chellehmalzadeh, J. A. Anderson, D. Popscu, Iovitzu Popescu

Research output: Contribution to journalArticle

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Abstract

The multiphoton excitation of rubidium has been investigated over the 4600-6500- wavelength region with a tunable dye-laser source having a linewidth better than 0.1 and a space-charge ionization detector sensitive to a few ions per second. Multiphoton transitions have been observed to occur both through intermediate atomic states and through intermediate continuum states of the rubidium molecule. In the former case two-photon transitions have been observed from the 5S2 ground state of atomic rubidium to higher-lying nD2 levels for values of n ranging from 9 to 34 and to n S2 levels for values of n from 11 through 20. The fine-structure intervals of the n D2 levels for n=9toc13 were measured together with the line-strength ratios and were found to be in good agreement with the predictions of a simple theoretical model. At the shorter wavelengths hybrid two-photon resonances were observed to be excited through resonant intermediate continuum states of Rb2. As a result the dispersion curve for two-photon absorption in rubidium showed what appears to be resonant intermediate pπ(u13) and 0g+ terms dissociating to give a 5P32 atom and resulting in the strong development of features corresponding to the 5P322→nD32,522 part of the diffuse series, for n≤50 in absorption and the 5P322→nS122 part of the sharp series. Components to 32D2 and 30S2 were recorded to a precision of 0.3 cm-1 and quantum defects for these previously unobserved terms were derived. The corresponding hybrid two-photon resonances involving intermediate states dissociating to give a 5P122 atom were not observed in the wavelength interval available in this experiment.

Original languageEnglish (US)
Pages (from-to)1662-1671
Number of pages10
JournalPhysical Review A
Volume14
Issue number5
DOIs
StatePublished - 1976

Fingerprint

rubidium
ionization
photons
wavelengths
continuums
intervals
tunable lasers
dye lasers
atoms
space charge
fine structure
ground state
detectors
defects
curves
predictions
excitation
molecules
ions

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics

Cite this

Collins, C. B., Curry, S. M., Johnson, B. W., Mirza, M. Y., Chellehmalzadeh, M. A., Anderson, J. A., ... Popescu, I. (1976). Multiphoton ionization of rubidium. Physical Review A, 14(5), 1662-1671. https://doi.org/10.1103/PhysRevA.14.1662

Multiphoton ionization of rubidium. / Collins, C. B.; Curry, S. M.; Johnson, B. W.; Mirza, M. Y.; Chellehmalzadeh, M. A.; Anderson, J. A.; Popscu, D.; Popescu, Iovitzu.

In: Physical Review A, Vol. 14, No. 5, 1976, p. 1662-1671.

Research output: Contribution to journalArticle

Collins, CB, Curry, SM, Johnson, BW, Mirza, MY, Chellehmalzadeh, MA, Anderson, JA, Popscu, D & Popescu, I 1976, 'Multiphoton ionization of rubidium', Physical Review A, vol. 14, no. 5, pp. 1662-1671. https://doi.org/10.1103/PhysRevA.14.1662
Collins CB, Curry SM, Johnson BW, Mirza MY, Chellehmalzadeh MA, Anderson JA et al. Multiphoton ionization of rubidium. Physical Review A. 1976;14(5):1662-1671. https://doi.org/10.1103/PhysRevA.14.1662
Collins, C. B. ; Curry, S. M. ; Johnson, B. W. ; Mirza, M. Y. ; Chellehmalzadeh, M. A. ; Anderson, J. A. ; Popscu, D. ; Popescu, Iovitzu. / Multiphoton ionization of rubidium. In: Physical Review A. 1976 ; Vol. 14, No. 5. pp. 1662-1671.
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N2 - The multiphoton excitation of rubidium has been investigated over the 4600-6500- wavelength region with a tunable dye-laser source having a linewidth better than 0.1 and a space-charge ionization detector sensitive to a few ions per second. Multiphoton transitions have been observed to occur both through intermediate atomic states and through intermediate continuum states of the rubidium molecule. In the former case two-photon transitions have been observed from the 5S2 ground state of atomic rubidium to higher-lying nD2 levels for values of n ranging from 9 to 34 and to n S2 levels for values of n from 11 through 20. The fine-structure intervals of the n D2 levels for n=9toc13 were measured together with the line-strength ratios and were found to be in good agreement with the predictions of a simple theoretical model. At the shorter wavelengths hybrid two-photon resonances were observed to be excited through resonant intermediate continuum states of Rb2. As a result the dispersion curve for two-photon absorption in rubidium showed what appears to be resonant intermediate pπ(u13) and 0g+ terms dissociating to give a 5P32 atom and resulting in the strong development of features corresponding to the 5P322→nD32,522 part of the diffuse series, for n≤50 in absorption and the 5P322→nS122 part of the sharp series. Components to 32D2 and 30S2 were recorded to a precision of 0.3 cm-1 and quantum defects for these previously unobserved terms were derived. The corresponding hybrid two-photon resonances involving intermediate states dissociating to give a 5P122 atom were not observed in the wavelength interval available in this experiment.

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