A sensitive spectral survey of interstellar features in the near-UV
  [3050-3700{\AA}]
  We present a comprehensive and sensitive unbiased survey of interstellar
features in the near-UV range (3050-3700 {\AA}). We combined a large number of
VLT/UVES archival observations of a sample of highly reddened early type stars
-- typical diffuse interstellar band (DIB) targets -- and unreddened standards.
We stacked the individual observations to obtain a reddened "superspectrum" in
the interstellar rest frame with a signal-to-noise (S/N) ratio exceeding 1500.
We compared this to the analogous geocentric and stellar rest frame
superspectra as well as to an unreddened superspectrum to find interstellar
absorption features. We find 30 known features (11 atomic and 19 molecular) and
tentatively detect up to 7 new interstellar absorption lines of unknown origin.
Our survey is sensitive to narrow and weak features; telluric residuals
preclude us from detecting broader features. For each sightline, we measured
fundamental parameters (radial velocities, line widths, and equivalent widths)
of the detected interstellar features. We also revisit upper limits for the
column densities of small, neutral polycyclic aromatic hydrocarbon (PAH)
molecules that have strong transitions in this wavelength range.
