SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Svanberg Sune) srt2:(1975-1979)"

Sökning: WFRF:(Svanberg Sune) > (1975-1979)

  • Resultat 1-10 av 25
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Belin, G, et al. (författare)
  • Hyperfine Interaction, Zeeman and Stark Effects for Excited States in Cesium
  • 1976
  • Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 14:1-2, s. 39-47
  • Tidskriftsartikel (refereegranskat)abstract
    • Our previous measurements in the P and D series in 133 Cs have been extended to a number of higher lying levels, populated in a two-step excitation process involving an rf lamp and a CW dye laser. The D states were studied with the level-crossing technique, while the optical-double-resonance method was used for the investigation of the P states. For the magnetic dipole interaction constant a , the Landé g J factor, and the tensor polarizability α 2 we obtain 12 2 P 3/2 : a = 1.10(3) MHz, g J = 1.3340(15) 13 2 P 3/2 : a = 0.77(5) MHz, g J = 1.3337(20) 7 2 D 3/2 : | a | = 7.4(2) MHz 14 2 D 3/2 : | a | = 0.425(7) MHz 15 2 D 3/2 : | a | = 0.325(8) MHz 16 2 D 3/2 : | a | = 0.255(12) MHz 17 2 D 3/2 : | a | = 0.190(12) MHz 18 2 D 3/2 : | a | = 0.160(10) MHz 13 2 D 5/2 : α 2 = 19(1) GHz/(kV/cm) 2 14 2 D 5/2 : α 2 = 37(2) GHz/(kV/cm) 2 15 2 D 5/2 : α 2 = 70(4) GHz/(kV/cm) 2 16 2 D 5/2 : α 2 = 120(6) GHz/(kV/cm) 2 17 2 D 5/2 : α 2 = 199(10) GHz/(kV/cm) 2 18 2 D 5/2 : α 2 = 323(16) GHz/(kV/cm) 2 Ab initio calculations of many-body perturbation type, including polarization effects to all orders, have been performed in order to obtain theoretical values of the hyperfine structure constants. The resulting a factors are listed together with the corresponding experimental values for most S, P , and D states in 133 Cs measured so far. The discrepancy between the experimental and theoretical values is mainly due to the omission of the correlation effect, which is essentially as important as the polarization effect. Still, for the D states the polarization effect is large enough to yield negative values for all the 2 D 5/2 states, which is in accordance with the experimental results. Semiempirical values of the a factors have also been obtained using the Fermi-Segré-Goudsmit formula, and the results are compared with the experimental values. The measured values of α 2 agree well with values calculated with the Coulomb approximation due to Bates and Damgaard.
  •  
2.
  • Belin, G, et al. (författare)
  • Hyperfine Interaction, Zeeman and Stark Effects for Excited States in Potassium
  • 1975
  • Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 12:5, s. 287-294
  • Tidskriftsartikel (refereegranskat)abstract
    • Using the optical double resonance and level crossing methods, properties of several excited S , P , and D states in 39 K were studied. The S and D states were populated using stepwise excitation with the first P state as an intermediate level. An rf lamp and a CW dye laser were used in the first and second excitation steps, respectively. The studied P states were populated in the cascade decay of states, excited with the laser. The following results for the magnetic depole interaction constant a, the Landé g J factor, and the tensor polarizability α 2 were obtained for the studied states: 7 2 S 1/2 : a = 10.78(5) MHz, g J = 2.0020(10); 8 2 S 1/2 : a = 5.99(8) MHz, g J = 2.0028(12); 6 2 P 1/2 : a = 4.05(7) MHz, g J = 0.6663(4); 6 2 P 3/2 : a = 0.89(5) MHz, g J = 1.3337(8); 7 2 P 1/2 : a = 2.18(5) MHz, g J = 0.6659(6); 7 2 P 3/2 : a = 0.49(4) MHz, g J = 1.3336(8); 5 2 D 3/2 : |a| = 0.44(10) MHz, g J = 0.7997(7), |α 2 | = 9.64(45) MHz/(kV)/cm) 2 ; 5 2 D 5/2 : |a| = 0.24(7) MHz, g J = 1.2004(10), |α 2 | = 13.4(7) MHz/(kV)/cm) 2 ; 6 2 D 3/2 : |a| = 0.2(2) MHz, g J = 0.7997(14), |α 2 | = 33.8(1.7) MHz/(kV)/cm) 2 ; 6 2 D 5/2 : |a| = 0.1(1) MHz, g J = 1.2013(20), |α 2 | = 47.6(2.4) MHz/(kV)/cm) 2 . Theoretical values for the magnetic dipole interaction constant have been obtained using a limited many-body perturbation expansion. The Polarization effect, which is due to single excitations from the restricted Hartree-Fock model, is included to all orders, while the true correlation effect is omitted. The results are compared with the experimental values, and the agreement is found to be quite good. For the S and P states the polarization effect is of the order of 10-20%, and it is responsible for roughly half of the deviation of the Hartree-Fock values from experiment. For the D states, on the other hand, the effects are much more drastic. The sign of the a factors has not been measured. The perturbative calculation yields positive values for all 2 D 3/2 states and negative values for all 2 D 5/2 states. The theoretical magnitudes are in agreement with the observed ones.
  •  
3.
  • Belin, G, et al. (författare)
  • Hyperfine Interaction, Zeeman and Stark Effects for Excited States in Rubidium
  • 1976
  • Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 13:6, s. 351-362
  • Tidskriftsartikel (refereegranskat)abstract
    • Highly excited P and D states in 87 Rb were examined using a two-step excitation procedure. A conventional rf lamp and a CW dye laser were used for the first and second step, respectively. The following results for the magnetic dipole interaction constant a , the electric quadrupole interaction constant b , the Landé g J factor, and the tensor polarizability α 2 were obtained in level-crossing and optical-double-resonance experiments: 9 2 P 3/2 : a = 4.05(3) MHz, b =0.55(3) MHz, g J = 1.3335(15) 10 2 P 3/2 : a = 2.60(8) MHz, g J = 1.3332(20) 8 2 D 3/2 : a = 2.840(15) MHz, b = 0.17(2) MHz 8 2 D 5/2 : a = -1.20(15) MHz, g J = 1.1998(15) 9 2 D 3/2 : a = 1.900(10) MHz, b = 0.11(3) MHz 9 2 D 5/2 : a = (-)0.80(15) MHz, g J = 1.1995(15), α 2 = 180.3(9.0) MHz/(kV/cm) 2 Many-body calculations of the hyperfine structure of Rb have been performed. The polarization effect is included to all orders, whereas the correlation effect is omitted. The negative a factors for the 2 D 5/2 states, indicating large perturbations, are explained by the polarization contribution. A review of experimental hyperfine interaction constants, Landé g J factors and tensor polarizabilities for rubidium is given together with theoretical values of the a factors. The quadrupole moment for 87 Rb is obtained from the b factors for the 2 P 3/2 and 2 D 3/2 states, using quadrupole parameters from the many-body calculations. The correlation effect is included in a semi-empirical way.
  •  
4.
  •  
5.
  • Fredriksson, K, et al. (författare)
  • Fine-structure measurements for highly excited F states of cesium
  • 1978
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 284:4, s. 429-430
  • Tidskriftsartikel (refereegranskat)abstract
    • The fine-structure splittings of highly excited F-states in Cs were measured using high-resolution laser spectroscopy. The 12 and 132F states were found to be inverted with splittings ?E (122F)=-522(3) MHz and ?E (132F)=-416(3) MHz.
  •  
6.
  • Fredriksson, K, et al. (författare)
  • Investigation of the fine structure in the 2 D sequence of sodium using level-crossing spectroscopy
  • 1976
  • Ingår i: Journal of Physics B: Atomic and Molecular Physics. - : IOP Publishing. - 0022-3700. ; 9:8, s. 1237-1246
  • 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.
  •  
7.
  •  
8.
  • Fredriksson, K, et al. (författare)
  • Lidar system applied in atmospheric pollution monitoring
  • 1979
  • Ingår i: Applied Optics. - 2155-3165. ; 18:17, s. 2998-3003
  • Tidskriftsartikel (refereegranskat)abstract
    • A lidar system, incorporating tunable dye lasers and a 25-cm diam Newtonian telescope, has been constructed and applied in atmospheric pollution monitoring. The system, which is fully controlled by a specially designed microcomputer, has been used in several field tests, where stack effluents as well as the ambient air have been monitored. Results from particle, NO2, and SO2 measurements are discussed.
  •  
9.
  • Fredriksson, K, et al. (författare)
  • Measurement of the fine-structure splitting of the 4^(2)D state of lithium using level-crossing spectroscopy
  • 1977
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 283:3, s. 227-230
  • Tidskriftsartikel (refereegranskat)abstract
    • The fine-structure splitting of the 42D state in lithium was measured using stepwise laser excitation combined with level-crossing spectroscopy. The splitting was determined to be 456.2(0.8) MHz, a considerably higher value than the one obtained in a recent level-anticrossing measurement. The new value is in good agreement with the result of a Hartree-Fock calculation, 460.2 MHz.
  •  
10.
  • Fredriksson, K, et al. (författare)
  • Stark interaction for excited states in alkali atoms, investigated by laser spectroscopy
  • 1977
  • Ingår i: Zeitschrift für Physik A Hadrons and Nuclei. - 0939-7922. ; 281:3, s. 189-197
  • Tidskriftsartikel (refereegranskat)abstract
    • The scalar polarizability constanta0 for excitedS- andD-states in rubidium and cesium was measured utilizing a two-step excitation scheme. An rf lamp and a single-mode dye laser were used to excite the atoms in a collimated atomic beam. Values ofa0 were determined for the 9–102S1/2 and 7–82D3/2 states of rubidium and for the 10–132S1/2, 9–102D3/2 and 9–112D5/2 states of cesium. Further, the isotope shift was evaluated in the 5579 Å rubidium line. A review of experimental polarizability constants for rubidium and cesium is given, and the results are compared with theoretical values.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 25

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy