| 1. |
- Fredriksson, K, et al.
(författare)
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Investigation of the fine structure in the 2 D sequence of sodium using level-crossing spectroscopy
- 1976
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Ingår i: Journal of Physics B: Atomic and Molecular Physics. - : IOP Publishing. - 0022-3700. ; 9:8, s. 1237-1246
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Tidskriftsartikel (refereegranskat)abstract
- Splittings in the n 2 D sequence were measured for n=4-9. An accuracy of about 0.1% was obtained in level-crossing measurements on an atomic beam. The D states were populated by step-wise excitation, using an RF lamp and a CW dye laser. A method for measuring the sign of the spin-orbit coupling constant is demonstrated. With the present measurements, the highly anomalous n 2 D sequence in sodium has now been studied for n=3-16.
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| 2. |
- Grundevik, P, et al.
(författare)
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Hyperfine-structure study in the P sequence of 23 Na using quantum-beam spectroscopy
- 1979
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Ingår i: Journal of Physics B: Atomic and Molecular Physics. - : IOP Publishing. - 0022-3700. ; 12:16
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Tidskriftsartikel (refereegranskat)abstract
- Describes use of the quantum-beat method to study hyperfine structure in the 5 2 P 3/2 and 6 2 P 3/2 states of 23 Na. A pulsed dye laser, frequency-doubled into the UV region, was used to excite sodium atoms abruptly in a beam. The fluorescent light was recorded with a fast transient digitiser, interfaced to a micro-computer. Theoretical calculations using many-body perturbation theory were performed for the entire P sequence measured so far, taking polarisation and correlation effects into account separately. Very good agreement between experimental and theoretical values was obtained.
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| 3. |
- Lundberg, Hans, et al.
(författare)
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Hyperfine structure in the sequence of sodium S states
- 1977
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Ingår i: Journal of Physics B: Atomic and Molecular Physics. - : IOP Publishing. - 0022-3700. ; 10:10, s. 1971-1978
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Tidskriftsartikel (refereegranskat)abstract
- The hyperfine structure for the 6, 7 and 8 2 S 1/2 states of 23 Na was measured by optical double-resonance techniques. The states were populated by step-wise excitation using two CW dye lasers. For the dipole interaction constant a, a(6 2 S 1/2 ) = 37.5(2) MHz, a(7 2 S 1/2 )=20.9(1) MHz, a(8 2 S 1/2 )=12.85(10) MHz. were obtained. Theoretical calculations of the hyperfine structure were performed for the 3-8 2 S 1/2 states using many-body perturbation techniques. When polarization as well as certain correlation effects are included in the calculation, an agreement with the experimental values within 2% is obtained.
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| 4. |
- Jones, L A, et al.
(författare)
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Measurement of the total collisional ionization rates of Ne VI, VII and VIII
- 1977
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Ingår i: J Phys B. - : Institute of Physics (IOP). ; 10, s. 187-195
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Tidskriftsartikel (refereegranskat)abstract
- The total collisional ionization rates of neon VI, VII and VIII have been measured in a time-evolving theta-pinch plasma. The method used was to calculate the expected emission from the plasma using the measured time- and space-dependent electron density (1016-1017 cm-3) and temperature (120-400 eV). The semi-empirical ionization rates of Kunze and Lotz were used in the calculation and were adjusted, by multiplying with a constant, so that the predicted photon emission matched the observed line emission. The multiplicative factors, with estimated errors, required for best fit are: for neon VI, 0.15+or-0.1; for neon VII, 0.4+or-0.2; and for neon VIII, 0.7+or-0.25.
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