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  • 1. Dabrowska-Kloda, Kinga
    et al.
    Kloda, Tomasz
    Stockholm University, Faculty of Science, Department of Physics.
    Boudiaf, Sara
    Jakobsson, Gurmar
    Stenevi, Ulf
    Incidence and risk factors of late in-the-bag intraocular lens dislocation: Evaluation of 140 eyes between 1992 and 20122015In: Journal of cataract and refractive surgery, ISSN 0886-3350, E-ISSN 1873-4502, Vol. 41, no 7, p. 1376-1382Article in journal (Refereed)
    Abstract [en]

    PURPOSE: To identify risk factors for late in-the-bag intraocular lens (IOL) dislocation and estimate the incidence of this condition over a 21-year period. SETTING: Department of Ophthalmology, County Hospital of Varmland, Karlstad, Sweden. DESIGN: Retrospective cohort study and nested case-control study. METHODS: The medical records of eyes operated on for late in-the-bag IOL dislocation between 1992 and 2012 were reviewed. The annual incidence and cumulative risk were calculated. RESULTS: Of 140 eyes whose records were reviewed, 123 qualified for comparison (24 variables) with an equal number in a control group. The annual incidence varied between 0.00% and 0.08%. An increasing trend was found (P<.001). The cumulative risk 5, 10, 15, and 20 years after cataract extraction was 0.09%, 0.55%, 1.00%, and 1.00%, respectively, and was significantly higher (P<.001) in eyes that had cataract surgery between 2002 and 2012 than in those operated on between 1992 and 2001 (0.89% versus 0.39% at 10 years postoperatively) (P<.001). Calendar time (date) of dislocation was positively correlated with the duration of preceding pseudophakia (P = .005). Phacoemulsification time was longer in eyes with dislocation than in control eyes (P < .001). Other identified risk factors were pseudoexfoliation, zonular dehiscence, pseudophacodonesis, and increased axial length. CONCLUSIONS: The increasing number of late in-the-bag IOL dislocations cannot be explained by the growing pseudophakic population only. The increase in the incidence was due primarily to the longer duration of pseudophakia in the population and to a greater dislocation risk with recent cataract surgery. The increase in life expectancy played a minor role. Long phacoemulsification time was a risk factor for dislocation.

  • 2.
    Elshakre, M.
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Storchi, L.
    Kloda, Tomasz
    Stockholm University, Faculty of Science, Department of Physics.
    Linusson, Per
    Stockholm University, Faculty of Science, Department of Physics.
    Heijkenskjold, F.
    Gengelbach, A.
    Karlsson, L.
    Hansson, Tony
    Stockholm University, Faculty of Science, Department of Physics.
    Tarantelli, F.
    Feifel, R.
    A photoelectron and double photoionization study of the valence electronic structure of 1,4-bromofluorobenzene2009In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 131, no 18, p. 184302-Article in journal (Refereed)
    Abstract [en]

    Conventional photoelectron and time-of-flight photoelectron-photoelectron coincidence (TOF-PEPECO) spectra have been measured for the outer valence region of the 1,4-bromofluorobenzene molecule. The photoelectron spectra were recorded using Hela radiation from a resonance Source, and the TOF-PEPECO spectra were recorded using HeII alpha radiation from a pulsed resonance source. The former provide energies of the cationic states and the latter of the dicationic states. The spectra are adequately interpreted with the aid of accurate Green's function calculations, showing very significant correlation effects. The lowest double ionization energy is found at 23.45 eV associated with the (4b(1))X-2 (1)A(1) dicationic state.

  • 3.
    Kloda, Tomasz
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Matsuda, Akitaka
    Karlsson, Hans O.
    Elshakre, Mohamed
    Linusson, Per
    Stockholm University, Faculty of Science, Department of Physics.
    Eland, John H. D.
    Feifel, Raimund
    Hansson, Tony
    Stockholm University, Faculty of Science, Department of Physics.
    Strong-field photoionization of O-2 at intermediate light intensity2010In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 82, no 3, p. 33431-Article in journal (Refereed)
    Abstract [en]

    We investigated by electron spectroscopy the strong-field multiphoton ionization of O-2 molecules with ultrashort laser pulses in the intensity range between the multiphoton and tunneling regimes. The ionization proceeds by at least three different mechanisms, in addition to the eight- and nine-photon nonresonant pathways. Transient multiphoton resonances with vibrational Rydberg levels give rise to direct Freeman-type peaks with sublaser linewidth and spin-orbit splitting. Some resonance levels actually become populated and yield extremely narrow lines because of postpulse vibrational autoionization. When the lowest photon order resonance channel for the Rydberg states is closed, a third contribution becomes dominant with a main peak at 0.4 eV that shares its main properties with the recently discovered universal low-energy structure in the electron spectra of atoms and molecules [C. I. Blaga et al., Nat. Phys. 5, 335 (2009); W. Quan et al., Phys. Rev. Lett. 103, 093001 (2009)]. The variation of the Freeman resonance spectrum with the laser peak intensity is well correlated with the vibronic Franck-Condon factors for the overlap of the intermediate Rydberg state with the O-2 ground state. Accordingly, the Freeman peaks could be unambiguously assigned to individual vibronic multiphoton resonances, and the disappearance of the Freeman resonances at a certain laser intensity could be explained. The population of the autoionizing Rydberg states could be assigned similarly to such vibronic resonances.

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