Measurement of L X-ray production cross sections and Li subshell fluorescence yields

Study of vacancy decays in the L-shell photoionization of barium in the excitation energy range of 5.6–30 keV: from L2edge to energy high above the thresholds of double L-vacancy production

“…In the present analysis, theoretical photoionization cross sections were mainly taken from a table by Scofield [51]. The fluorescence and CK yields were taken from the evaluation of Krause [52] and Chen et al [39], and also from recently reported values [34,37,40,[60][61][62][63]. The L x-ray emission rates were taken from the relativistic Hartree-Fock values calculated by Scofield [37].…”

“…As can be seen in figure 4 and table 2, the calculations categorized into group-1 poorly reproduce the observations. In group-1, we employed the values of the fluorescence yields determined by the photoionization method using a radioactive isotope [34,61]. These physical parameters can hardly reproduce the observations even if we choose any subsets for the CK yields.…”

“…In order to understand the intrashell vacancy transfer processes, extensive effort has been put into studying the deexcitation processes associated with L-shell vacancies both experimentally [28][29][30][31][32][33][34][35] and theoretically [36][37][38][39][40]. With the advent of modern synchrotron radiation (SR) sources, photoionization methods offer substantial advantages in studying the intrashell vacancy transfer processes due to the precise energy tunability of the exciting photon beam, which enables us to selectively ionize a particular subshell of the target element.…”

Measurement of L subshell fluorescence cross sections and intensity ratios of heavy elements at 22.6keV

“…The L l , L a , L b and L g X-ray production cross sections and average L-shell fluorescence yields for Yb, Hf, W, Os, Hg, Tl, Pb, Th and U have been measured (Ozdemir and Durak, 2000). The L l ,L a ,L b and L g X-ray production cross sections, L i (i¼1,2,3) subshell cross sections and subshell fluorescence yields for some elements in the atomic range 55rZr81 at 59.54 and 15.73 keV have been measured by Kaya and Ertugrul (2003). Salah (2004) has determined L a , L b and L g XRF cross sections and I Kb /I Ka , I Lg /I La relative intensities for La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb and Lu at an excitation energy of 17.78 keV.…”

Measurement of L Shell X-Ray Production and Average L Shell Fluorescence Yields for Some Heavy Elements at 123.6 keV

“…A review of the literature shows that a number of experimental studies on the L shell reported more than other shells, because of the prevalent irradiated energies could be excited for most elements. Numerous experiments have been carried out to measure L X-ray cross--sections using 241 Am radioactive source (at the excitation energy 59.543 keV) in different elements [1][2][3][4][5][6][7][8][9][10][11][12][13]. Some experimental studies were carried out using secondary target irradiated by 241 Am radioactive source [14][15][16][17][18].…”