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  • 1. Fedosseev, V. N.
    et al.
    Berg, Lars Erik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Lebas, N.
    Launila, Olli J.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Lindroos, M.
    Losito, R.
    Marsh, B. A.
    Österdahl, Fabian K.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Pauchard, Thomas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Tranströmer, Göran
    KTH, School of Engineering Sciences (SCI), Physics.
    Vannesjö, Johanna
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    ISOLDE RILIS: New beams, new facilities2008In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 266, no 19-20, p. 4378-4382Article in journal (Refereed)
    Abstract [en]

    The resonance ionization laser ion source (RILIS) at the ISOLDE on-line isotope separator is based on the selective excitation of atomic transitions by tunable laser radiation. New ion beams have been produced with RILIS in recent years: Sb, Sc, Dy, Au, Hg and Po. In total, isotopes of 26 different elements have been selectively laser-ionized and separated at ISOLDE. In order to facilitate the work on development of atomic ionization schemes an off-line laser laboratory has been established at CERN. Operating independently of the on-line RI LIS setup, this laboratory will be capable of providing extensive data on atomic transitions, in particular between highly excited and auto-ionizing atomic states, which are required for the improvement of the RILIS efficiency. Additionally, the program gram of upgrading the on-line RI LIS system by the implementation of solid state lasers will be presented.

  • 2.
    Liu, M.
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Pauchard, Thomas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Sjödin, Marica
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Launila, Olli
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics (Closed 20101231).
    van der Meulen, P.
    Berg, Lars-Erik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics (Closed 20101231).
    Time-resolved study of the A(2)Pi state of CaH by laser spectroscopy2009In: Journal of Molecular Spectroscopy, ISSN 0022-2852, E-ISSN 1096-083X, Vol. 257, no 1, p. 105-107Article in journal (Refereed)
    Abstract [en]

    A time-resolved experiment on the A(2)Pi state of gaseous calcium hydride has been performed by applying laser spectroscopic methods. The following zero-pressure lifetime was obtained for the CaH A(2)Pi state: tau(nu=0) = 33.2 (+/- 3.2) ns and tau(nu=1) = 33.7 (+/- 5.2) ns. The lifetime was found to be the same for the A(2)Pi(1/2) and Delta(2)Pi(3/2) states.

  • 3. Marsh, B. A.
    et al.
    Berg, Lars-Erik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Fedorov, D. V.
    Fedosseev, V. N.
    Launila, Olli
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Lindroos, M.
    Losito, R.
    Österdahl, Fabian
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Pauchard, Thomas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Pohjalainen, I. T.
    Sassenberg, U.
    Seliverstov, M. D.
    Sjödin, Anna Marica
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Tranströmer, Göran
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    The ISOLDE RILIS pump laser upgrade and the LARIS Laboratory2010In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 196, no 1-3, p. 129-141Article in journal (Refereed)
    Abstract [en]

    On account of its high efficiency, speed and unmatched selectivity, the Resonance Ionization Laser Ion Source (RILIS) is the preferred method for ionizing the nuclear reaction products at the ISOLDE on-line isotope separator facility. By exploiting the unique electronic energy level 'fingerprint' of a chosen element, the RILIS process of laser step-wise resonance ionization enables an ion beam of high chemical purity to be sent through the mass selective separator magnet. The isobaric purity of a beam of a chosen isotope is therefore greatly increased. The RILIS, comprising of up to three frequency tunable pulsed dye lasers has been upgraded with the installation of a Nd:YAG pump laser as a replacement for the old Copper Vapor Laser (CVL) system. A summary of the current Nd:YAG pumped RILIS performance is given. To accompany the RILIS pump laser upgrade, a new ionization scheme for manganese has been developed at the newly constructed LAser Resonance Ionization Spectroscopy (LARIS) laboratory and successfully applied for on-line RILIS operation. An overview of the LARIS facility is given along with details of the ionization scheme development work for manganese.

  • 4. Pauchard, T.
    et al.
    Liu, M.
    Launila, Olli
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Berg, Lars-Erik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Time-resolved studies of the A(2)Pi and B-2 Sigma states of SrH by laser spectroscopy2008In: Journal of Molecular Spectroscopy, ISSN 0022-2852, E-ISSN 1096-083X, Vol. 247, no 2, p. 181-183Article in journal (Refereed)
  • 5. Schwellnus, F.
    et al.
    Catherall, R.
    Crepieux, B.
    Fedosseev, V. N.
    Marsh, B. A.
    Mattolat, Ch.
    Menna, M.
    Österdahl, Fabian
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Raeder, S.
    Stora, T.
    Wendt, K.
    Study of low work function materials for hot cavity resonance ionization laser ion sources2009In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 267, no 10, p. 1856-1861Article in journal (Refereed)
    Abstract [en]

    The selectivity of a hot cavity resonance ionization laser ion source (RILIS) is most often limited by contributions from competing surface ionization of the hot walls of the ionization cavity. In this article we present investigations on the properties of designated high temperature, low work function materials regarding their performance and suitability as cavity material for RILIS. Tungsten test cavities, impregnated with a mixture of barium oxide and strontium oxide (BaOSrO on W), or alternatively gadolinium hexaboride (GdB6) were studied in comparison to a standard tungsten RILIS cavity as being routinely used for hot cavity laser ionization at ISOLDE. Measurement campaigns took place at the off-line mass separators at ISOLDE/CERN, Geneva and RISIKO/University of Mainz.

  • 6.
    Vieitez Hornos, Maria Ofelia
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    XUV Laser Studies of Rydberg-Valence States in N2 and H+H- Heavy Rydberg States2010Doctoral thesis, monograph (Other academic)
  • 7.
    Vieitez, Maria Ofelia
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Hedberg, Jonas
    KTH, School of Engineering Sciences (SCI), Physics.
    Launila, Olli
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Berg, Lars-Erik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Chemical Physics.
    Elemental analysis of steel scrap metals and minerals by laser-induced breakdown spectroscopy2005In: Spectrochimica Acta Part B - Atomic Spectroscopy, ISSN 0584-8547, E-ISSN 1873-3565, Vol. 60, no 7-8, p. 920-925Article in journal (Refereed)
    Abstract [en]

    The atomic emission of laser-induced plasma on steel samples has been studied for quantitative elemental analysis. The plasma has been created with 8 ns wide pulses using the second-harmonic from a Q-switched Nd:YAG laser, in air at atmospheric pressure. The plasma emission is detected with temporal resolution, using an Echelle spectrometer of wide spectral range (300-900 nm) combined with an intensified charge coupled device camera. A plasma temperature of 7800 400 K is determined using the Boltzmann plot method, from spectra obtained under optimized experimental conditions. As an example of an industrial application the concentration of copper in scrap metals is studied, which is an important factor to determine the quality of the samples to recycle. Cu concentrations down to 200 ppm can be detected. Another application of the laser-induced plasma spectroscopy method is the measurement of the nickel and copper concentrations in an iron-containing sample of reduced magma from the 1870s expedition to western Greenland by Adolf Erik Nordenskiold. Different spectral lines of nickel are used for calibration, and their results are compared.

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