Hanle effect in the singlet excited states of the alkaline earths

Kelly, F. M.; Mathur, M. S.

doi:10.1139/p80-181

Cited by 42 publications

(15 citation statements)

References 2 publications

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“…There are also theoretical concerns about this normalization method at lower energies, since the basis of the GOS approach is similar to that of the first Born approximation. The value of OOS = 1.723 calculated by Fursa and Bray (2001) is within 6% of the most recent experimental data of Kelly and Mathur (1980) and of Liljeby et al (1980). At 20 eV, the close-coupling methods give a GOS close to 1.0 at 0…”

Section: Differential Cross Sectionssupporting

confidence: 85%

Electron scattering from magnesium at an incident energy of 20 eV

Brown

Crowe

Fursa

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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Excitation of the 3 1 P state of magnesium by 20 eV electrons has been studied experimentally using the scattered-electron-polarized-photon correlation method over a wide range of scattering angles (10• -120 • ) and theoretically using the convergent close-coupling and R-matrix with pseudostates methods. The measured linear Stokes parameters, and the circular polarization calculated from these parameters, assuming coherent excitation, are generally well produced by these theoretical models as well as by some previous theories. Relative differential cross sections for elastic scattering and excitation of the 3 1 P and 3 3 P states were also measured over the angular range 10• -140• . The results are compared with those from previous experiments and with present and previous theoretical predictions.

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Section: Differential Cross Sectionssupporting

confidence: 85%

Electron scattering from magnesium at an incident energy of 20 eV

Brown

Crowe

Fursa

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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“…Experimentally determined lifetimes are given by several authors with high accuracy for the ~P1 state [9] and we will here use the average 4.47 (5) ns of the most recent measurements. The values presented for the 3p~ state are less accurate and inconsistent, due to experimental difficulties concerning the long lifetime of this state.…”

Section: Analysis Of the Experimental Hyperfine Structurementioning

confidence: 99%

Analysis of the hyperfine structure of the 4s 4p configuration in Ca and the nuclear quadrupole moment of43Ca

Olsson

Salomonson

1982

Z Physik A

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Hyperfine structure (r -3) integrals are calculated for the 4s4p configuration in Ca, including the effects of core polarization. This is done with the use of LS-dependent Hartree-Fock orbitals. The calculated effects describe well the magnetic hyperfine structure for the 3p term. The description of the 1p term is less good, however, due to the effects of the strong correlation between the valence electrons for this term. The intermediate coupling in the lowest sp configurations of Mg, Ca and Sr is analysed considering also the spin-spin interaction. Using the ab initio (r -3) integrals, the determined intermediate coupling and the experimentally known hyperfine constants, second-order hyperfine corrections are calculated and accurate a q-and biLparameters evaluated for 43Ca. This resolves the previously inconsistent results for b ~ determined from the 3P 1 and 3P a b-factors for this isotope. An accurate value for b ~ in the 3p term of 43Ca is b~ -13.27(6) MHz. Combined with the calculated (r-3) ~ integral, this gives a more accurate value for the nuclear quadrupole moment of 43Ca than given earlier, Q(43Ca)=-49(5) mb, where the uncertainty comes from the uncertainty estimated for the (r-3) ~ integral.

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“…Despite the lifetimes of the lowest nsnp [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24], persistent discrepancies remain. Only very recently, Zinner et al [3] have achieved 0.4% accuracy for the rate of 4s4p S 0 transition in calcium.…”

Section: Introductionmentioning

confidence: 99%

Many-body calculations of electric-dipole amplitudes for transitions between low-lying levels of Mg, Ca, and Sr

et al. 2001

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To support efforts on cooling and trapping of alkaline-earth atoms and designs of atomic clocks, we performed ab initio relativistic many-body calculations of electric-dipole transition amplitudes between low-lying states of Mg, Ca, and Sr. In particular, we report amplitudes, and for 3 P o 2 → 1 D 2 transitions. For Ca, the reduced matrix element 4s4p 1 P o 1 ||D||4s 2 1 S 0 is in a good agreement with a high-precision experimental value deduced from photoassociation spectroscopy [Zinner et al., Phys. Rev. Lett. 85, 2292 ]. An estimated uncertainty of the calculated lifetime of the 3s3p 1 P o 1 state of Mg is a factor of three smaller than that of the most accurate experiment. Calculated binding energies reproduce experimental values within 0.1-0.2%.

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Hanle effect in the singlet excited states of the alkaline earths

Cited by 42 publications

References 2 publications

Electron scattering from magnesium at an incident energy of 20 eV

Electron scattering from magnesium at an incident energy of 20 eV

Analysis of the hyperfine structure of the 4s 4p configuration in Ca and the nuclear quadrupole moment of43Ca

Many-body calculations of electric-dipole amplitudes for transitions between low-lying levels of Mg, Ca, and Sr

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