ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The wavelengths of severalKα x-rays emitted from elements in and neighboring the rare earth region which were contained in radioactive sources have been determined with the two-meter quartz bent-crystal spectrometer at the California Institute of Technology. The results of the measurements in XU are the following: SmKα2, 313·043; SmKα1, 308·390; EuKα2, 302·477; EuKα1, 297·824; GdKα2, 292·432; GdKα1, 287·746; TmKα2, 248·592; TmKα1, 243·859; YbKα2, 240·934; YbKα1, 236·184; LuKα2, 233·610; LuKα1, 228·834; HfKα2, 226·605; HfKα1, 221·805. The estimated maximal error for each measurement is ±0·015 XU. From comparing the present measurements with precise measurements of the corresponding x-rays from the naturally occurring elements, it can be concluded that there are no observable shifts in the x-rays from the radioactive sources within 0·017 XU. An upper limit of 2·5 eV is obtained for an observable shift due to the isotope shift or the isomeric shift in the GdKα x-rays from a radioactive Eu source. Upper limits for the observation of shifts due to the isomeric shift in theKα x-rays of 2·5 eV for Sm and of 4 eV for Tm and Lu are also obtained.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01375321
Permalink