I did a chem lab and now im not sure if im doing my calculations right .. Please help?

So i have to find out what ƒÉ will equal when i use the equation ƒÉ=d*(a/�ãa^2+b^2)

in my experiment i found out that a equals 108 cm, d and b were given to me .. so d=1.33*10^-6 m and b=2.0000 m

I plug the numbers in but they just don't seem right because im being asked for ƒÉ in cm then convert that number to nm find out frequence (s^-1) and energy (J/atom) but i think i might know how to do that .. i have eight more trials to go but this step is really holding be back , Please help me with just this exaple .. please help !