Can anyone explain the difference between T2g mode and F2g mode in Raman spectrum?

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Thomas Mayerhöfer

As far as I know both T and F both mean triply degenerated, but F is used for vibrations and T is used in case of orbitals. So if T or F is used in case of vibrations their is no real difference, it is just a matter of habit.

H. Slimi

what is the difference between the F2g and F1u modes

The "g" comes from the German "gerade" and the "u" from the German "ungerade". It means that there is a center of inversion as symmetry element and g is symmetric to this center of inversion. Accordingly the rule of mutual exclusion holds - g modes can only be Raman-active and u modes only IR-active.