Measurements on the K fluorescence yield of Cr, Mn, Cu and Ga

Krämer, Peter; Beer, Andreas; Bos, Miss E.C.; Blök, J.

doi:10.1016/0031-8914(62)90112-x

Cited by 14 publications

(6 citation statements)

References 6 publications

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“…The K-shell fluorescence yield of an atom is defined as the probability that a vacancy in the K-shell is filled through a radiative transition. Several attempts have been made, in a tabular form, for measuring (Al-Nasr et al, 1987;Arora et al, 1981;Ahmad, 1979;Broyles et al, 1953;Bertrand et al, 1959;Bambynek et al, 1965;Brabets et al, 1959;Balakrishna et al, 1994;Brunner, 1987;Bhan et al, 1981;Famoux, 1985;Casnati et al, 1991;Chen et al, 1979;Drever and Moljk, 1957;Durak and Sahin, 1998;Erman and Sujkowski, 1961;Espenschied and Hoffmann, 1978;Egorov et al, 1989;Fairbrother et al, 1957;Forest and Easterda, 1959;Freedman et al, 1977;Frey et al, 1958;Garg et al, 1985;Godeau, 1961;Gray, 1956;Graham and Merritt, 1961;Apaydın and Tıras -oglu, 2006;Geidelman et al, 1988;Gurov et al, 1981;Harrison et al, 1955;Han et al, 2007;Heintze, 1955;Hagedoorn and Konijn, 1957;Hagedoorn and Wapstra, 1960;Hoffman and Dropesky, 1958;Hribar et al, 1977;Konstantinov et al, 1961;Kramer et al, 1962;Kramer, 1961;Konstantinov et al, 196...…”

Section: Introductionmentioning

confidence: 98%

K-shell fluorescence yields for elements with 6≤Z≤99

Kahoul

Abassi

Deghfel

et al. 2011

Radiation Physics and Chemistry

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Section: Introductionmentioning

confidence: 98%

K-shell fluorescence yields for elements with 6≤Z≤99

Kahoul

Abassi

Deghfel

et al. 2011

Radiation Physics and Chemistry

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“…x KÀW , x KÀUNW , (K b =K a ) W , and (K b =K a ) UNW are the empirical values deduced from the formulas [10], [11], [17], and [18]; respectively.…”

Section: Calculation Of Vacancy Transfer Coefficient (G Kl )mentioning

confidence: 99%

“…The empirical K-shell fluorescence yields, Kb=Ka intensity ratio, and the vacancy transfer coefficient g KL calculated using the formulas [10], [11], [17], [18], [21], and [22] are given in Table 1 for all elements in the region 21 Z 30.…”

Section: Calculation Of Vacancy Transfer Coefficient (G Kl )mentioning

confidence: 99%

Empirical, Semi-Empirical and Experimental Determination of K X-Ray Fluorescence Parameters of Some Elements in the Atomic Range 21 ≤ Z ≤ 30

Aylıkçı

Kahoul

Aylikçi

et al. 2014

Spectroscopy Letters

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In this study, the semi-empirical and empirical calculations of K X-ray intensity ratios, K-shell fluorescence yields, and vacancy transfer probabilities have been performed for 3d transition elements. Also, r Ka , r Kb production cross-sections, K b =K a intensity ratios, x K fluorescence yields, and g KL vacancy transfer probabilities of 3d transition elements have been measured. The samples were excited by 59.5 keV c-rays from a 241 Am annular radioactive source. K X-rays emitted by samples were counted by an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV.

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“…However, the detailed nature of the ionization mechanisms are not understood. Following the standard method for charged particle beams [86,87] a double cell to decouple the optical pumping volume from the spin filter volume was tested, and found to be unaffected by the neutron beam. In further experiments the influence of gas composition was studied [88], in particular the role of the N 2 gas that is added to SEOP cells to suppress radiative decay of the 5p state of Rb [89].…”

Section: Pos(pstp 2013)022mentioning

confidence: 99%

Polarized 3He spin filters for neutron science

Gentile¹

2014

Proceedings of XVth International Workshop on Polarized Sources, Targets, and Polarimetry — PoS(PSTP2013)

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The large spin dependence of the absorption cross section for neutrons by 3 He gas provides a method to polarize neutron beams. For certain applications, such polarized 3 He-based neutron "spin filters" have advantages over conventional neutron optical polarizing methods. Spin filters operate at all neutron wavelengths, can cover a large angular range and/or a large energy range, and decouple neutron polarization from energy selection. Both spin-exchange optical pumping (SEOP) and metastability-exchange optical pumping (MEOP) are currently being employed to polarize 3 He spin filters at various neutron facilities worldwide. We focus on the development and application of SEOP-based neutron spin filters at the National Institute of Standards and Technology (NIST), Center for Neutron Research (NCNR). The combination of long relaxation time spin filter cells, high power spectrally narrowed diode lasers, and the use of Rb/K mixtures have allowed us to reach 3 He polarizations up to 85 % in spin filter cells ≈1 liter in volume. Studies have revealed limits to the achievable polarization from temperature-dependent relaxation and unexplained magnetic field dependence for relaxation in SEOP cells. Applications include neutron scattering methods such as triple-axis spectrometry and small angle neutron scattering, and fundamental neutron physics. In most neutron scattering applications, cells are transported to the beam line and stored in a magnetically shielded solenoid or box. A recent focus has been apparatus for wide-angle neutron polarization analysis. A measurement of the spin-dependence of the neutron-3 He scattering length was performed with a small, polarized 3 He cell located inside a neutron interferometer. A precision measurement of the neutron polarization for this experiment was also performed with a 3 He spin filter. Use of spin filters in high flux neutron beams have revealed beam-induced alkali-metal relaxation and long term effects on SEOP spin filter cells.

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Measurements on the K fluorescence yield of Cr, Mn, Cu and Ga

Cited by 14 publications

References 6 publications

K-shell fluorescence yields for elements with 6≤Z≤99

K-shell fluorescence yields for elements with 6≤Z≤99

Empirical, Semi-Empirical and Experimental Determination of K X-Ray Fluorescence Parameters of Some Elements in the Atomic Range 21 ≤ Z ≤ 30

Polarized 3He spin filters for neutron science

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