  We apply the method of QCD sum rules in the presence of external
electromagnetic fields $F_{\mu\nu}$ to the problem of the electromagnetic
decays of various vector mesons, such as $\rho\to\pi\gamma$, $K^\ast\to
K\gamma$ and $\eta'\to\rho\gamma$. The induced condensates obtained previously
from the study of baryon magnetic moments are adopted, thereby ensuring the
parameter-free nature of the present calculation. Further consistency is
reinforced by invoking various QCD sum rules for the meson masses. The
numerical results on the various radiative decays agree very well with the
experimental data.
