| 1. |
- Grafström, Peter, et al.
(författare)
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Hyperfine structure and isotope shift of highly excited barium-I states
- 1982
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Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 306:4, s. 281-284
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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.
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| 2. |
- Li, Yu, et al.
(författare)
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Optical emission enhancement of laser-produced copper plasma under a steady magnetic field
- 2009
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Ingår i: Applied Optics. - 1539-4522 .- 0003-6935. ; 48:4, s. 105-110
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Konferensbidrag (refereegranskat)abstract
- From a copper target, laser-ablated plasma was investigated by spectral- and temporal-resolved emission spectroscopy. With the presence of a 0.8T steady magnetic field, the emission of the expanding plasma showed significant enhancements of the spectral lines for all neutral, singly, and doubly ionized species. The relative enhancements for different species have been studied with temporal-resolved measurement by comparing the spectra obtained with and without the magnetic field. The enhanced emission from the plasma plume is attributed to an increase of the radiative recombination rate in the plasma due to magnetic confinement. The temporal evolution of the plasma parameters, including electron temperature and electron density, was deduced and discussed for the cases with and without a magnetic field. (C) 2008 Optical Society of America
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| 3. |
- Li, Yu, et al.
(författare)
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Spectroscopic characterization of aluminum plasma using laser-induced breakdown spectroscopy
- 2014
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Ingår i: Optik. - : Elsevier BV. - 0030-4026. ; 125:12, s. 2851-2855
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Tidskriftsartikel (refereegranskat)abstract
- A detailed investigation of aluminum plasma induced by a 1064 nm Nd:YAG laser in air was performed. The emission of spectral lines arising from Al I transition at 396.07 nm, Al II transition at 358.46 nm, Al Ill transition at 360.72 nm and Al IV transition at 363.05 nm were well-resolved. The plasma parameters including electron temperature and electron density were determined through the Boltzmann plot method using the emission line intensities of the same ionized stages of aluminum atoms and the Stark-broadening profiles of Al II emission line, respectively. The temporal evolutions of the spectral lines belonging to atomic and ionic aluminum elements and the plasma parameters were investigated at three different laser pulse energies. Moreover, the validity of local thermodynamic equilibrium was elucidated in our experimental condition. (c) 2014 Elsevier GmbH. All rights reserved.
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| 4. |
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| 5. |
- Xu, Huailiang, et al.
(författare)
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Lifetime measurements in neutral and singly ionized vanadium
- 2006
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Ingår i: Optical Society of America. Journal B: Optical Physics. - 0740-3224. ; 23:12, s. 2597-2600
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Tidskriftsartikel (refereegranskat)abstract
- Radiative lifetimes of ten odd-parity levels of V I belonging to the 3d(3)4s4p and 3d(4)4p configurations and of 11 odd-parity levels of V II belonging to the 3d(3)4p configuration are reported. The lifetimes were measured with use of single-step excitation and time-resolved fluorescence spectroscopy. The neutral and singly ionized vanadium atoms were produced in a laser-induced vanadium plasma. (c) 2006 Optical Society of America.
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| 6. |
- Yu, Xiance, et al.
(författare)
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Radiative lifetimes, branching fractions and oscillator strengths of some odd-parity levels in Ru I
- 2011
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Ingår i: Journal of Physics B: Atomic, Molecular and Optical Physics. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 44:21
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Tidskriftsartikel (refereegranskat)abstract
- Radiative lifetime measurements have been performed for six odd-parity levels of Ru I using a time-resolved laser-induced fluorescence technique. Branching fractions of seven odd-parity levels were also measured using a grating spectrometer with a hollow-cathode lamp. The results of lifetimes and branching fractions obtained here are combined to determine the absolute oscillator strengths of 25 lines for Ru I. The obtained results are compared with previous results when available.
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