[260] Sitzungsber. kaiserl. Akad. Wiss. Wien, 1903, 112, 1037.
[261] Amer. Chem. J. 1898, 20, 345.
[262] Zeitsch. anorg. Chem. 1898, 17, 310.
[263] Zeitsch. anorg. Chem. 1906, 50, 249.
Brauner’s earlier work,[264] carried out in 1898, gave the value 140·95. In 1901 this author[265] carried out an extensive research on the atomic weight of praseodymium, employing four different methods with spectroscopically pure material; the mean value of his very concordant results was 140·97, almost the value he obtained in 1901. A further investigation into the value of this constant appears desirable.
[264] Proc. Chem. Soc. 1898, 14, 70.
[265] Ibid. 1901, 17, 65; see also Abegg, III, i. 263.
Detection.
—The maxima of the absorption bands are given by Rech[266] as follows:
| Yellow | 596·4 and 588·2, weak. |
| Blue | 481·3 very intense. |
| 468·3 coincident with a neodymium band. | |
| Violet | 444·2 |