Open AccessOn the spectra of ordinary lead and lead of radioactive origin
Publication year - 1915
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1915.0009
Subject(s) - spectral line , thorium , isotope , lead (geology) , neon , chemistry , radiochemistry , physics , nuclear physics , argon , geology , organic chemistry , uranium , geomorphology , astronomy
The view that the spectra of isotopes are identical was first put to the test by Russell and Rossi and Exner and Hascheck, who examined the spectra of thorium and ionium preparations. The former of these observers worked with a mixture containing at least 10 per cent. Of ionium, but no lines were found which were not present in the spectrum of pure thoria. Aston has submitted neon to fractional diffusion, by which a partial separation was effected, as shown by the change of density, but no change in the spectrum was observed.