Give the multiplicity and parity for a C2 molecule that has
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Give the multiplicity and parity for a C2 molecule that has

[From: ] [author: ] [Date: 12-03-11] [Hit: ]
It is a g subshell with 2 electrons. So the parity is g*g = g.......
One of the excited states of the C2 molecule has the valence electron configuration 1σg^2 1σu^2 1πu^2 1πg^2. Give the multiplicity and parity of the term.

Thanks.

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The subshell of the 1πg^2, meaning it is a filled subshell (S=2). The electrons in the subshell is +1/2 and -1/2, so S = 0. The multiplicity is 2S+1 = 2(0)+1 = 1

For parity: u*u = g, u*g = u, g*g = g. Think of u as -1 and g as +1.

In this case, since all of the shells are filled, we look at the last one. It is a g subshell with 2 electrons. So the parity is g*g = g.
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