  We present an experimental study of the dissociative excitation in the
collision of helium ions with nitrogen and oxygen molecules for collision
energy of $0.7-10$ keV. Absolute emission cross sections are measured and
reported for most nitrogen and oxygen atomic and ionic lines in wide, vacuum
ultraviolet ($80-130$ nm) and visible ($380-800$ nm), spectral regions.
Remarkable similarities of the processes realized in He$^{+}+$N$_{2}$ and
He$^{+}+$O$_{2}$ collision systems are observed. We present polarization
measurements for He$^{+}+$N$_{2}$ collision system.
  The emission of excited dissociative products was detected using an improved
high-resolution optical spectroscopy method. This method incorporates the
retarding potential method and a high resolution electrostatic energy analyzer
to precisely measure the energy of incident particles and the energy of
dispersion. The improvement in the optics resolution allows us to measure the
cross section on the order of 10$^{-19}$ cm$^{2}$ or lower.
