  The photo-dissociation of H$_2$ by a nearby anisotropic source of radiation
is seen as a critical component in creating an environment in which a direct
collapse black hole may form. Employing radiative transfer we model the effect
of multi-frequency (0.76 eV - 60 eV) radiation on a collapsing halo at high
redshift. We vary both the shape of the spectrum which emits the radiation and
the distance to the emitting galaxy. We use blackbody spectra with temperatures
of $\rm{T = 10^4\ K}$ and $\rm{T = 10^5\ K}$ and a realistic stellar spectrum.
We find that an optimal zone exists between 1 kpc and 4 kpc from the emitting
galaxy. If the halo resides too close to the emitting galaxy the photo-ionising
radiation creates a large HII region which effectively disrupts the collapsing
halo, too far from the source and the radiation flux drops below the level of
the expected background and the H$_2$ fraction remains too high. When the
emitting galaxy is initially placed between 1 kpc and 2 kpc from the collapsing
halo, with a spectral shape consistent with a star-forming high redshift
galaxy, then a large central core forms. The mass of the central core is
between 5000 and 10000 $\rm{M_{\odot}}$ at a temperature of approximately 1000
K. This core is however surrounded by a reservoir of hotter gas at
approximately 8000 K which leads to mass inflow rates of the order of $\sim
0.1$ $\rm{M_{\odot}}$ yr$^{-1}$. This environment has the potential to form a
massive primordial star which can then lead to the formation of a direct
collapse black hole.
