How is the spin selection rule partially lifted in heavier transition metals?

Understand the Problem

The question is asking about the mechanisms involved in the lifting of spin selection rules in heavier transition metals. This pertains to understanding electronic configurations and interactions that affect spin states in these elements.

More Information

In heavier transition metals, spin-orbit coupling occurs due to the interaction between the spin and orbital angular momentum. This coupling leads to the partial lifting of the spin selection rule, allowing transitions that would otherwise be forbidden.

Tips

A common mistake is to ignore the role of spin-orbit coupling in heavier elements, which is significant due to their higher nuclear charge.

Sources

• Colors of transition metal complexes: Intensity of Color - web.iitd.ac.in
• CH2501 – Transition Metals Chemistry - zysman-colman.com
• Spin-forbidden transition of bromine - Chemistry Stack Exchange - chemistry.stackexchange.com