Play all audios:
ABSTRACT EXPERIMENTS conducted in this Institute1 had led to the conclusion that the blue fluorescence of fluorite excited by filtered ultra-violet light is due to traces of europium under
the influence of radioactive substances, and that a yellow-green fluorescence which some fluorites show at the temperature of liquid air—especially those from acid magmatic rocks—is, in the
same way, due to ytterbium. As these rare earths are those most readily obtained in the bivalent form2, as further the reducing action of Becquerel rays is well known, and as the blue
fluorescence can also be obtained in CaF2 containing europium, simply by reduction through heating, the hypothesis was put forward that these broad radio-photofluorescence bands are to be
ascribed to the _bivalent_ forms of the rare earths. Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution ACCESS OPTIONS
Access through your institution Subscribe to this journal Receive 51 print issues and online access $199.00 per year only $3.90 per issue Learn more Buy this article * Purchase on
SpringerLink * Instant access to full article PDF Buy now Prices may be subject to local taxes which are calculated during checkout ADDITIONAL ACCESS OPTIONS: * Log in * Learn about
institutional subscriptions * Read our FAQs * Contact customer support REFERENCES * H. Haberlandt, B. Karlik and K. Przibram, _Wien Ber._, IIa, 143, 151; 1934. See also _NATURE_, 133, 99;
1934. CAS Google Scholar * G. Jantsch and W. Klemm, _Z. anorgan. Chem._, 216, 80; 1933. Article CAS Google Scholar * For the line-fluorescence of other trivalent rare earth salts, see
R. Tomaschek and O. Deutschbein, _Phys. Z._, 34, 374; 1933 and M. Haitinger, _Wien. Ber._, IIa, 142, 339; 1933. Google Scholar Download references AUTHOR INFORMATION AUTHORS AND
AFFILIATIONS * Institut für Radiumforschung, Wien K. PRZIBRAM Authors * K. PRZIBRAM View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND
PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE PRZIBRAM, K. Fluorescence of Fluorite and the Bivalent Europium Ion. _Nature_ 135, 100 (1935).
https://doi.org/10.1038/135100a0 Download citation * Issue Date: 19 January 1935 * DOI: https://doi.org/10.1038/135100a0 SHARE THIS ARTICLE Anyone you share the following link with will be
able to read this content: Get shareable link Sorry, a shareable link is not currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing
initiative