q1)
Posted: Tue May 17, 2022 8:15 pm
q1)
(a) Explain what is meant by the singlet and triplet states of helium, with reference to the symmetry of the spin and spatial parts of the wavefunction. (b) Specify the possible term symbols for the different states of a helium atom whose two electrons are in a 1s2p configuration, using the normal nomenclature for multi-electron atoms. (c) Explain why the ground state of helium is a singlet state, and discuss the stability of the triplet states with reference to the transition rules.
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