Warning: ftp_nlist() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 438

Warning: ftp_pwd() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 230

Warning: ftp_pwd() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 230

Warning: ftp_pwd() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 230

Warning: ftp_nlist() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 438

Warning: ftp_pwd() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 230

Warning: ftp_pwd() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 230

Warning: ftp_pwd() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 764

Warning: ftp_pwd() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 230

Warning: ftp_pwd() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 230

Warning: ftp_mkdir() expects parameter 1 to be resource, null given in /home/evactron/www/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 580
Electron Probe Microanalysis of Transition Metals using L lines: The Effect of Self-absorption - Evactron®

ABSTRACT:
Electron microprobe-based quantitative compositional measurement of first-row transition metals using their La X-ray lines is hampered by, among other effects, self-absorption. This effect, which occurs when a broad X-ray line is located close to a broad absorption edge, is not accounted for by matrix corrections. To assess the error due to neglecting self-absorption, we calculate the La X-ray intensity emitted from metallic Fe, Ni, Cu, and n targets, assuming a Lorentzian profile for the X-ray line and taking into account the energy dependence of the mass absorption coefficient near the absorption edge. We find that calculated X-ray intensities depart increasingly, for increasing electron beam energy, from those obtained assuming a narrow X-ray line and a single fixed absorption coefficient (conventional approach), with a maximum deviation of ~15% for Ni and of ~10% for Fe. In contrast, X-ray intensities calculated for metallic n and Cu do not differ significantly from those obtained using the conventional approach. The implications of these results for the analysis of transition-metal compounds by electron probe microanalysis as well as strategies to account for self-absorption effects are discussed.

View PDF document here