µmFORMULAE:
 nmλ[nm] = λ[µm]*103
 eVE[eV] = h[eV s]*c[m/s]/λ[µm]*106
 cm-1ν̃[cm-1] = 104/λ[µm]
 MHzν[MHz] = c[m/s]/λ[µm]
c = 299792458 m/s
h = 4.13566733*10-15 eV s