MO labelling schemes

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etotheipi
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Two different labelling schemes for MOs are shown on the left and right of this diagram:

1602192168794.png


I understand the LHS naming scheme, since the MOs are simply labelled according to the AOs from which they are derived (along with ##\sigma##/##\pi## and ##u##/##g## for the MO).

I don't understand the numbering scheme on the RHS. The book says that 'orbitals of the same symmetry are distinguished from one another by numbering them 1,2,...'. What does this mean? Thanks.
 

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DrDu
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There is the first sigma_g orbital, the second sigma_g orbital, the first sigma_u orbital, the second sigma_u orbital .... The symmetry is specified here by sigma/pi and the u/g label.
 
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etotheipi
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There is the first sigma_g orbital, the second sigma_g orbital, the first sigma_u orbital, the second sigma_u orbital .... The symmetry is specified here by sigma/pi and the u/g label.
Ah, I see. Thanks!
 

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