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- W1989617053 abstract "The ${L}_{i}$- $(i=1--3)$ subshell x-ray spectra for the $_{52}text{T}text{e}$, $_{53}text{I}$, $_{55}text{C}text{s}$, $_{56}text{B}text{a}$, and $_{57}text{L}text{a}$ elements excited by Mn $Kensuremath{alpha}$ (${E}_{K{ensuremath{alpha}}_{2}}=5.888text{ }text{keV}$ and ${E}_{K{ensuremath{alpha}}_{1}}=5.899text{ }text{keV}$) x rays have been investigated using the $^{55}text{F}text{e}$ radioisotope in conjunction with a Cr absorber. A low-energy Ge detector was used to measure the $L$ x rays at an emission angle $ensuremath{psi}=126ifmmode^circelsetextdegreefi{}$, where the second-order Legendre polynomial term ${P}_{2}$ $(text{cos}text{ }ensuremath{psi})$ associated with the angular distribution is annulled. In the case of the $_{56}text{B}text{a}$ and $_{57}text{L}text{a}$ elements, alignment of the ${L}_{3}$-subshell vacancy states was investigated through angular distribution measurements of the emitted ${L}_{3}$-subshell x rays. The $L{ensuremath{alpha}}_{1,2}$ and $L{ensuremath{beta}}_{2,15}$ x-ray groups are observed to be nearly isotropic, while the data for the pure $Ll$ $({L}_{3}text{ensuremath{-}}{M}_{1})$ x-ray emission are indicative of a small anisotropic trend, though within experimental error. The integral x-ray fluorescence cross sections are deduced and interpreted in terms of ${L}_{i}$-subshell photoionization cross sections, fluorescence and Coster-Kronig yields, and x-ray emission rates. The ${L}_{2}$-subshell x-ray cross sections for $_{57}text{L}text{a}$ measured using targets of lanthanum (III) fluoride and dilanthanum (III) trioxide are found to be unusually higher. The enhancement is observed due to the contribution of the ${L}_{2}$-subshell radiative resonant Raman scattering (RRS) of Mn $Kensuremath{alpha}$ x rays having energy around the ${L}_{2}$-subshell binding energy of $_{57}text{L}text{a}$ in these compounds. Also, the observed enhancement of the ${L}_{3}$-subshell x-ray cross sections in $_{57}text{L}text{a}$ is suggestive of intrashell vacancy transfer via ${L}_{2}text{ensuremath{-}}{L}_{3}$ Coster-Kronig RRS transitions. The ${L}_{2}$-subshell total RRS cross sections in $_{57}text{L}text{a}$ have been deduced from the present measured attenuation coefficients for Mn $Kensuremath{alpha}$ x rays in ${text{La}}_{2}{text{O}}_{3}$ and ${text{LaF}}_{3}$. The ${L}_{2}$-subshell radiative and total RRS cross sections in $_{57}text{L}text{a}$ using ${text{LaF}}_{3}$ are higher by $ensuremath{sim}30%$ than those using ${text{La}}_{2}{text{O}}_{3}$. The contribution of processes predicted in the framework of Mozouchi's four-band model involving inner subshells along with the valence and conduction bands of these wide-band-gap insulator compounds is likely to account for the observed results. The ${L}_{2}$-subshell radiative and ${L}_{2}text{ensuremath{-}}{L}_{3}$ Coster-Kronig yields and the ratio of the ${L}_{2}text{ensuremath{-}}{M}_{4}$ and ${L}_{2}text{ensuremath{-}}{N}_{4}$ radiative RRS intensities in both La compounds are found to be same and are consistent with values from photoexcited vacancy decay. The ${L}_{2}$-subshell radiative RRS was also observed to be isotropic." @default.
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- W1989617053 date "2008-07-18" @default.
- W1989617053 modified "2023-10-18" @default.
- W1989617053 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>L</mml:mi></mml:math>-subshell vacancy decay processes for elements with<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mn>52</mml:mn><mml:mo>≤</mml:mo><mml:mi>Z</mml:mi><mml:mo>≤</mml:mo><mml:mn>57</mml:mn></mml:mrow></mml:math>following ionization using Mn<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>K</mml:mi><mml:mi>α</mml:…" @default.
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- W1989617053 doi "https://doi.org/10.1103/physreva.78.012507" @default.
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