1. The problem statement, all variables and given/known data Hi, I have this question which I need some help on: (Q) With the aid of an energy level diagram identify the transitions which give rise to the first line of the principal, sharp, diffuse and fundamental series in parahelium and in orthohelium. Also identify the form of the fine structure associated with each line (i.e. are the lines singlets, triplets, sextuplets, etc...?) Do all parahelium atoms produce singlet states due to the fact that electrons have a spin antiparallel to the ground state electron. And do all orthohelium atoms produce triplet states due to the fact electron have a spin parallel to the ground state electron? I think I'm wrong in saying that and there is something vital which I'm missing out. Thanks.