Abstract
It is known that in the case of the salts of the rare earths both in their crystalline form and in solution, absorption spectra with particularly clear and fine lines can be obtained by the application of very low temperatures, and that the investigation of the optical and magneto-optical properties of these substances at the temperatures which can be reached by means of liquid air and liquid hydrogen opens up a new method for the study of selective absorption 1).
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Notes
Jean Becquerel 1906, 1907, 1908, 1909, le Radium t. IV. p. 49. p. 107, p. 328, p. 383, t. V. p. 5; Physik. Zeitschr. t. VIII p. 632, p. 929.
Jean Becquerel and H. Kamerlingh Onnes Comm. N°. 103. C. R. t. CXLVI p 625. le Radium t. V p. 227.
Edmond Becquerel Mém. de l’Ac. d. Sciences t. XL. Ann de Ch. et de Phys. 5e ser t. X p. 5. Henri Becqerel. C. R. t. CI 1885 p. 1252.
Henri Becquerel C. R. t. CXLIV 1907 p. 459 en p. 671.
Comm. N°. 103. Le Radium t. V. p. 227.
Henei Becquerel. C. R. t. CXLIV 1907 p. 671.
Edmond Becquerel. Mém. de 1’ Acad. d. Sc. t XL p. 8 en 15.
Edmond Becqerel loc. cit. § 4 etc. Henri Becquerel C. R. t. CI 1885 p. 1259.
Henei Becquerel, C. R. CXXII, p. 420. (1896).
Henri Becquerbl C. R. t CI. 1885, p 1252.
P. Lenard and V. Klatt, Ann. d. Phys. (4) 15. 1904, p. 225–282 and 425–672.
P. Lenard, Verh. d. Naturhist. Med. Ver. Heidelberg 5 Febr. 4909.
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Becquerel, H., Becquerel, J., Onnes, H.K. (1991). On phosphorescence at very low temperatures. In: Gavroglu, K., Goudaroulis, Y. (eds) Through Measurement to Knowledge. Boston Studies in the Philosophy of Science, vol 124. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2079-8_13
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