Search results
Results from the WOW.Com Content Network
The usual atomic term symbols assume LS coupling (also known as Russell–Saunders coupling), in which the atom's total spin quantum number S and the total orbital angular momentum quantum number L are "good quantum numbers". (Russell–Saunders coupling is named after Henry Norris Russell and Frederick Albert Saunders, who described it in 1925 ...
The order of the first few terms are listed as follows: 1s, 1p 3 / 2 , 1p 1 / 2 , 1d 5 / 2 , 2s, 1d 3 / 2 ... For further clarification on the notation refer to the article on the Russell–Saunders term symbol.
Term symbols are used to represent the states and spectral transitions of atoms, they are found from coupling of angular momenta mentioned above. When the state of an atom has been specified with a term symbol, the allowed transitions can be found through selection rules by considering which transitions would conserve angular momentum.
As an example, consider the ground state of silicon. The electron configuration of Si is 1s 2 2s 2 2p 6 3s 2 3p 2 (see spectroscopic notation ). We need to consider only the outer 3p 2 electrons, for which it can be shown (see term symbols ) that the possible terms allowed by the Pauli exclusion principle are 1 D , 3 P , and 1 S .
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
This notation is used to specify electron configurations and to create the term symbol for the electron states in a multi-electron atom. When writing a term symbol, the above scheme for a single electron's orbital quantum number is applied to the total orbital angular momentum associated to an electron state. [4]
The AOL.com video experience serves up the best video content from AOL and around the web, curating informative and entertaining snackable videos.
Henry Norris Russell ForMemRS HFRSE FRAS (October 25, 1877 – February 18, 1957) was an American astronomer who, along with Ejnar Hertzsprung, developed the Hertzsprung–Russell diagram (1910). In 1923, working with Frederick Saunders , he developed Russell–Saunders coupling, which is also known as LS coupling .