| 释义 |
Pickering2 Physics.|ˈpɪkərɪŋ|
The name of Edward Charles Pickering (1846–1919), U.S. astronomer, used, usu. attrib., with reference to a series of lines in the spectrum of ionized helium with wave numbers represented by 4R(1/42–1/m2) (where R is the Rydberg constant and m = 5, 6,{ddd}), of which the first line has a wavelength of 1012 nanometres and the series limit is at 364 nanometres; (observed by Pickering in 1896 (Astrophysical Jrnl. IV. 369, V. 92)).
1922A. D. Udden tr. Bohr's Theory of Spectra i. 3 Recently however the question has been reopened and Fowler (1912) has succeeded in observing the Pickering lines in ordinary laboratory experiments. 1923H. L. Brose tr. Sommerfeld's Atomic Struct. & Spectral Lines iv. 208 Pickering's series (7) includes only one-half of the lines represented by (7a), namely, those for which k is odd. Ibid., It is..unjustifiable and arbitrary to detach one⁓half as the Pickering series and to ascribe it to hydrogen. The other half was overlooked earlier only because it could not be separated from the neighbouring true hydrogen lines. 1942J. D. Stranathan ‘Particles’ of Mod. Physics vi. 222 Alternate lines of the Pickering series of helium coincide almost exactly with the Balmer lines of hydrogen. But..the Pickering lines fall at slightly shorter wave lengths. 1967W. R. Hindmarsh Atomic Spectra ii. 5 It was first believed that the Pickering series arose from a special form of hydrogen but it is now known to be due to ionized helium. |