  We present temporal information obtained by mass spectrometry techniques
about the evolution of plasmas generated by laser filamentation in air. The
experimental setup used in this work allowed us to study not only the dynamics
of the filament core but also of the energy reservoir that surrounds it.
Furthermore, valuable insights about the chemistry of such systems like the
photofragmentation and/or formation of molecules were obtained. The
interpretation of the experimental results are supported by PIC (particle in
cell) simulations.
