Singlett and tripplett in atomic physics.

[Larsson]

1. Determine all terms in the configuration 4s^2 4p 4d in neutral germanium

The answear is

Singlett P,D and F
Tripplett P,D and F

But I don't really understand what singlett and tripplett means, and how do I know which tearms there are?

 

[malawi_glenn]

Singlet and triplet refers to the Spin quantum number.

http://www.astro.indiana.edu/~classweb/a540/notes/011_7Mar_ch11.ppt

= 2*S + 1

if S = 0 you get 1 : singlet
if S = 1 you get 3 : triplet