  Raman optical activity spectra of
$\Lambda$-tris-(ethylenediamine)-rhodium(III) ([Rh(en)$_3$]$^{3+}$) have been
calculated at 16 on-, near-, and off-resonant wavelengths between 290 nm and
800 nm. The resulting spectra are analyzed in detail with a focus on the
observed resonance effects. Since several electronically excited states are
involved, the spectra are never monosignate, as is often observed in resonance
Raman optical activity spectra. Most normal modes are enhanced through these
resonance effects, but in several cases, de-enhancement effects are found. The
molecular origins of the Raman optical activity intensity for selected normal
modes are established by means of group coupling matrices. In general, this
methodology allows one to produce an intuitive explanation for the intensity
behavior of a given normal mode. However, due to the complex electronic
structure of [Rh(en)$_3$]$^{3+}$, there are some intriguing resonance effects
the origins of which could not be fully clarified in terms of group coupling
effects. Therefore, simple and general rules that predict how the intensity of
a specific normal mode is affected by resonance effects are difficult to
devise.
