Question

A [IrBr6]2- octahedral complex undergoes stretching of Ir-Br bond at the frequency of 280 cm^-1. The Ir-Br bond length is 1.96 Angstrom. Evaluate the maximum bond length in the lowest and first excited vibrational states. hint: assume that the the reduced mass can be approximated through the mass of Br and the mass of the rest (IrBr5).

Answer 1

It is derived from Rotational constant and Bond length formula.