Competition between autoionization and dissociation in the [O2+(B 2Σg-)]nl and [O2+(c 4Σu- )]nl Rydberg states investigated by photon-induced dissociation to neutral fragments

Y. Hikosaka; P. Lablanquie; M. Ahmad; R. I. Hall; J. G. Lambourne; F. Penent; J. H.D. Eland

doi:10.1088/0953-4075/36/21/010

Competition between autoionization and dissociation in the [O₂⁺(B ²Σ_g^-)]nl and [O₂⁺(c ⁴Σ_u^-)]nl Rydberg states investigated by photon-induced dissociation to neutral fragments

Y. Hikosaka^*, P. Lablanquie, M. Ahmad, R. I. Hall, J. G. Lambourne, F. Penent, J. H.D. Eland

^*Corresponding author for this work

Faculty of Liberal Arts and Sciences

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Formation of fluorescing and metastable fragments from photon-induced dissociation of O₂ has been investigated in the 20.2-21.2 eV and 22.5-25.0 eV photon energy regions under high resolution. The neutral particles are detected using a microchannel plate stack, where electric potentials prevent charged particles from reaching the detector. Yield curves of excited neutral particles exhibit peaks at Rydberg states converging to O₂⁺(B ²Σ_g^-) and O₂⁺(c ⁴Σ_u^-). Furthermore, these yields are strongly enhanced at high-n, enabling the measurement of their energy location and width. A simple model for the decay of the Rydberg states converging to O₂⁺(c ⁴Σ_u^-) based on the competition between autoionization and neutral dissociation is used to describe qualitatively the observed spectrum. The results indicate that the lifetime of the O₂⁺(c ⁴Σ_u^-)v = 0 level is two orders of magnitude longer than that of the O₂⁺(c ⁴Σ_u^-)v = 1 level.

Original language	English
Pages (from-to)	4311-4326
Number of pages	16
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	36
Issue number	21
DOIs	https://doi.org/10.1088/0953-4075/36/21/010
State	Published - 2003/11/14

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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10.1088/0953-4075/36/21/010

Cite this

Hikosaka, Y., Lablanquie, P., Ahmad, M., Hall, R. I., Lambourne, J. G., Penent, F., & Eland, J. H. D. (2003). Competition between autoionization and dissociation in the [O₂⁺(B ²Σ_g^-)]nl and [O₂⁺(c ⁴Σ_u^-)]nl Rydberg states investigated by photon-induced dissociation to neutral fragments. Journal of Physics B: Atomic, Molecular and Optical Physics, 36(21), 4311-4326. https://doi.org/10.1088/0953-4075/36/21/010

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title = "Competition between autoionization and dissociation in the [O2+(B 2Σg-)]nl and [O2+(c 4Σu- )]nl Rydberg states investigated by photon-induced dissociation to neutral fragments",

abstract = "Formation of fluorescing and metastable fragments from photon-induced dissociation of O2 has been investigated in the 20.2-21.2 eV and 22.5-25.0 eV photon energy regions under high resolution. The neutral particles are detected using a microchannel plate stack, where electric potentials prevent charged particles from reaching the detector. Yield curves of excited neutral particles exhibit peaks at Rydberg states converging to O2+(B 2Σg-) and O2+(c 4Σu-). Furthermore, these yields are strongly enhanced at high-n, enabling the measurement of their energy location and width. A simple model for the decay of the Rydberg states converging to O2+(c 4Σu-) based on the competition between autoionization and neutral dissociation is used to describe qualitatively the observed spectrum. The results indicate that the lifetime of the O2+(c 4Σu-)v = 0 level is two orders of magnitude longer than that of the O2+(c 4Σu-)v = 1 level.",

author = "Y. Hikosaka and P. Lablanquie and M. Ahmad and Hall, {R. I.} and Lambourne, {J. G.} and F. Penent and Eland, {J. H.D.}",

year = "2003",

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doi = "10.1088/0953-4075/36/21/010",

language = "英語",

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Hikosaka, Y, Lablanquie, P, Ahmad, M, Hall, RI, Lambourne, JG, Penent, F & Eland, JHD 2003, 'Competition between autoionization and dissociation in the [O₂⁺(B ²Σ_g^-)]nl and [O₂⁺(c ⁴Σ_u^-)]nl Rydberg states investigated by photon-induced dissociation to neutral fragments', Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 36, no. 21, pp. 4311-4326. https://doi.org/10.1088/0953-4075/36/21/010

Competition between autoionization and dissociation in the [O₂⁺(B ²Σ_g^-)]nl and [O₂⁺(c ⁴Σ_u^-)]nl Rydberg states investigated by photon-induced dissociation to neutral fragments. / Hikosaka, Y.; Lablanquie, P.; Ahmad, M. et al.
In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 36, No. 21, 14.11.2003, p. 4311-4326.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Competition between autoionization and dissociation in the [O2+(B 2Σg-)]nl and [O2+(c 4Σu- )]nl Rydberg states investigated by photon-induced dissociation to neutral fragments

AU - Hikosaka, Y.

AU - Lablanquie, P.

AU - Ahmad, M.

AU - Hall, R. I.

AU - Lambourne, J. G.

AU - Penent, F.

AU - Eland, J. H.D.

PY - 2003/11/14

Y1 - 2003/11/14

N2 - Formation of fluorescing and metastable fragments from photon-induced dissociation of O2 has been investigated in the 20.2-21.2 eV and 22.5-25.0 eV photon energy regions under high resolution. The neutral particles are detected using a microchannel plate stack, where electric potentials prevent charged particles from reaching the detector. Yield curves of excited neutral particles exhibit peaks at Rydberg states converging to O2+(B 2Σg-) and O2+(c 4Σu-). Furthermore, these yields are strongly enhanced at high-n, enabling the measurement of their energy location and width. A simple model for the decay of the Rydberg states converging to O2+(c 4Σu-) based on the competition between autoionization and neutral dissociation is used to describe qualitatively the observed spectrum. The results indicate that the lifetime of the O2+(c 4Σu-)v = 0 level is two orders of magnitude longer than that of the O2+(c 4Σu-)v = 1 level.

AB - Formation of fluorescing and metastable fragments from photon-induced dissociation of O2 has been investigated in the 20.2-21.2 eV and 22.5-25.0 eV photon energy regions under high resolution. The neutral particles are detected using a microchannel plate stack, where electric potentials prevent charged particles from reaching the detector. Yield curves of excited neutral particles exhibit peaks at Rydberg states converging to O2+(B 2Σg-) and O2+(c 4Σu-). Furthermore, these yields are strongly enhanced at high-n, enabling the measurement of their energy location and width. A simple model for the decay of the Rydberg states converging to O2+(c 4Σu-) based on the competition between autoionization and neutral dissociation is used to describe qualitatively the observed spectrum. The results indicate that the lifetime of the O2+(c 4Σu-)v = 0 level is two orders of magnitude longer than that of the O2+(c 4Σu-)v = 1 level.

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