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  • Belfrage, Christina, et al. (författare)
  • Doppler-Free Laser Spectroscopy Measurements on a Ne Discharge for Determination of 22Ne-20Ne Isotope Shifts
  • 1983
  • Ingår i: Physica Scripta. - Institute of Physics Publishing Ltd.. - 0031-8949. ; 27:5, s. 357-370
  • Tidskriftsartikel (refereegranskat)abstract
    • We have used Doppler-free polarization spectroscopy, intermodulated fluorescence and intermodulated optogalvanic spectroscopy for measuring isotope shifts in 6 Ne lines connecting the 2p53s and 2p53p configurations. The measurements were performed on two different hollow cathodes. For the 5852, 5882, 5945, 5976, 6143 and 6164 A lines the 22Ne-20Ne isotope shift was found to be 2300(15), 1740(2), 1717(3), 1728(5), 1669(4) and 1663(5) MHz, respectively. These results are in fair agreement with previous optical spectroscopy data.
  • Bengtsson, Magnus, et al. (författare)
  • Lidar fluorescence measurements of algal growth on electrical insulators
  • 2003
  • Ingår i: 2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666). - IEEE--Institute of Electrical and Electronics Engineers Inc.. - 0-7803-7734-6 ; s. 473-473
  • Konferensbidrag (refereegranskat)abstract
    • Fluorescence measurements using lidar techniques have been shown to be useful for monitoring of algal growth on e.g. historical monuments. In this experiment similar measurements were performed on electrical insulators to examine the correlation between algal growth and the quality of the insulator, a factor of importance in the high-voltage grid management
  • Bengtsson, Magnus, et al. (författare)
  • Remote laser-induced breakdown spectroscopy for the detection and removal of salt on metal and polymeric surfaces
  • 2006
  • Ingår i: Applied Spectroscopy. - Society for Applied Spectroscopy. - 1943-3530. ; 60:10, s. 1188-1191
  • Tidskriftsartikel (refereegranskat)abstract
    • The detection of contamination such as salt in outdoor high-voltage insulator systems and its subsequent removal are vital for a reliable transmission of electric power. Remote detection of salt on a copper metal surface was carried out by using a mobile laser-induced breakdown spectroscopy (LIBS) Lidar system with a laser wavelength of 355 nm. Detection of salt on a polymeric high-voltage insulator was obtained when an additional lens was inserted into the beam path, and the number of photons that was detected could be calculated by using a calibrated white light source. Ablative cleaning could readily be carried out with LIBS and was verified by observing the disappearance of the sodium D-line emission.
  • Dernfalk, Andreas, 1975-, et al. (författare)
  • Laser-induced fluorescence spectroscopy for detection of biological contamination on composite insulators
  • 2003
  • Ingår i: In Proc. 13th International Symposium on High Voltage Engineering, Delft, Netherlands.
  • Konferensbidrag (refereegranskat)abstract
    • A new technique for remote detection of biological contamination on high-voltage outdoor insulators has been investigated. The technique, which is based on laser-induced fluorescence (LIF) spectroscopy, has been applied to study surfaces of real silicon rubber insulators from a distance of approximately 60 m. Measurements were performed outdoors on a number of clean, as well as, biologically contaminated insulators. Several types of biological contamination were included, as five of the studied insulators had become covered when installed in Sweden, and another three had been contaminated by fungal growth in laboratory. Fluorescence spectra obtained from the surfaces of the described insulators are presented and the applicability of the technique is discussed and compared with photographic methods.
  • Grafström, Peter, et al. (författare)
  • Hyperfine structure and isotope shift of highly excited barium-I states
  • 1982
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - Springer. - 0939-7922. ; 306:4, s. 281-284
  • Tidskriftsartikel (refereegranskat)abstract
    • High-resolution laser-spectroscopy measurements of hyperfine structure and isotope shifts were performed for the 6snd 1 D 2 sequence of Ba-I in the regionn=12–24. Stepwise laser excitations of a collimated atomic beam were used. A strong influence on the hyperfine structure is observed at the perturbation atn=14, caused by interaction with the 5d7d configuration. Whereas the isotope shift for the even isotopes stays essentially constant with increasingn, the odd isotopes exhibit a strong change, indicating hyperfine-induced shifts. Interesting discussions with Prof. E. Matthias in the final stage of this work are gratefully acknowledged. This work was supported by the Swedish Natural Science Research Council.
  • Jonsson, G, et al. (författare)
  • Hyperfine structure and radiative lifetimes in the 3s2n p2P3/2 sequence of Al-27 using time resolved laser spectroscopy
  • 1984
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - Springer. - 0939-7922. ; 316:3, s. 259-263
  • Tidskriftsartikel (refereegranskat)abstract
    • Using time-resolved laser spectroscopy we have determined the hyperfine structure in the 3s2n p2P3/2 sequence of27Al (I=5/2). The magnetic-dipole interaction constants were found to scale withn*-2.85 (n* is the effective principal quantum number) in the investigated regionn=6–12. Significant quadrupole interaction constants were obtained forn=6–9. The measured radiative lifetimes forn=6–12 scale withn*2.
  • Jönsson, G., et al. (författare)
  • Natural radiative lifetimes in the 3 sns 1S0 and 3 snd 1D2 sequences of magnesium
  • 1984
  • Ingår i: Physical Review A. - American Physical Society (APS). ; A30:5, s. 2429-2432
  • Tidskriftsartikel (refereegranskat)abstract
    • Natural radiative lifetimes have been determined in the determined in the 3 sns 1S0 (n=4-15) and the 3 snd 1D2 (n=3-15) sequences of Mg I employing a pulsed-laser system. The radiative lifetimes in the 1S0 sequence and of the higher members in the 1D2 sequence are unperturbed and scale as (n*)2.6 (where n* is the effective principal quantum number), while the lifetimes of the lower members in the 1D2 sequence are perturbed by the doubly excited 3p2 configuration. The measured lifetimes are compared with available theoretical calculations, and a very good agreement is obtained.
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