The present status of the field of fluorescence yields, radiationless (Auger and Coster-Kronig) and radiative transition probabilities is summarized. Tables of experimental and theoretical results are included, and tables of "best values" of important quantities are presented.

X-Ray Fluorescence Yields, Auger, and Coster-Kronig Transition Probabilities

Energy levels of Z = 11−21 nuclei (IV)

A method of computing theoretical X-ray spectra in the range 30-150 kV is presented. The theoretical spectra are compared with constant potential, high resolution spectra from a tungsten target measured with a Ge(Li) detector, for a range of target angles, tube voltage and filtrations. Above 100 kV the spectra were also measured with a NaI detector but, as there was good agreement between the Ge(Li) and NaI detectors, only the former are presented. Spectra computed using Kramers' theory are also included for comparison, giving fairly good agreement at large target angles (30 degrees) but becoming gradually worse as the target angle decreased. Spectra may be computed by this method for any desired filtration, target angle, and tube voltage between 30 and 150 kV, in excellent agreement with the measured data.

https://iopscience.iop.org/article/10.1088/0031-9155/24/3/002/pdf

Computation of bremsstrahlung X-ray spectra and comparison with spectra measured with a Ge(Li) detector

Experimental K and L relative x-ray emission ratess

The theory of nuclear electron capture is reviewed in the light of current understanding of weak interactions. Experimental methods and results regarding capture probabilities, capture ratios, and EC/Beta(+) ratios are summarized. Radiative electron capture is discussed, including both theory and experiment. Atomic wave function overlap and electron exchange effects are covered, as are atomic transitions that accompany nuclear electron capture. Tables are provided to assist the reader in determining quantities of interest for specific cases.

Orbital electron capture by the nucleus

Average $L$- and $M$-shell-vacancy distributions produced in the deexcitation of atoms that have been singly ionized in the $K$ shell or one of the $L$ subshells are derived from a comprehensive set of available experimental and theoretical data on radiative- and Auger-transition rates. The data are supplemented by new calculations in $j\ensuremath{-}j$ coupling from nonrelativistic screened hydrogenic wave functions of the following radiationless transition rates: $K\ensuremath{-}LL$, $K\ensuremath{-}LM$, and $K\ensuremath{-}LN$ for selected elements with $20\ensuremath{\le}Z\ensuremath{\le}81$, and ${L}_{i}\ensuremath{-}MM$, ${L}_{i}\ensuremath{-}MX$, and ${L}_{i}\ensuremath{-}XY$ for $26\ensuremath{\le}Z\ensuremath{\le}93$. Experimental and theoretical data on Auger- and radiative-transition probabilities are critically compared. Auger-electron intensity ratios and $\frac{K{\ensuremath{\alpha}}_{2}}{K{\ensuremath{\alpha}}_{1}}$ and $\frac{K\ensuremath{\beta}}{K\ensuremath{\alpha}}$ x-ray intensity ratios from a best fit to experimental data are tabulated for even atomic numbers from 20 to 94. The probability, per initial $K$ vacancy, of vacancy production in each ${L}_{i}$ subshell is derived from experimental data and tabulated for $20\ensuremath{\le}Z\ensuremath{\le}94$; components due to Auger and x-ray transitions are listed separately. These probabilities agree well with purely theoretical vacancy distributions also derived here. The probability of $M$-shell-vacancy production in the decay of $K$ and ${L}_{i}$ vacancies is derived from theory and tabulated for selected atoms with $16\ensuremath{\le}Z\ensuremath{\le}93$.

P. Venugopala Rao

Papers

Atomic Vacancy Distributions Produced by Inner-Shell Ionization

Decay of 75Se

Electron-Capture Ratio and Internal Bremsstrahlung in W-181 Decay

High-Z L-Subshell X-Ray Emission Rates

L-2-L N-3 Coster-Kronig Transition Probabilities and L-Subshell Fluorescence Yields of Hg and Ta