The yield of air fluorescence induced by electrons

Details The yield of air fluorescence induced by electrons The yield of air fluorescence induced by electrons

2006-04-24

arxiv.org/abs/astro-ph/0604498v2

Astropart.Phys.26:231-242,2006

Astronomy and Astrophysics

Astrophysics

27 pages, 12 figures, 64 references. Accepted in Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2006.06.

The fluorescence yield for dry air and pure nitrogen excited by electrons is calculated using a combination of well-established molecular properties and experimental data of the involved cross sections. Particular attention has been paid to the role of secondary electrons from ionization processes. At high pressure and high energy, observed fluorescence turns out to be proportional to the ionization cross section which follows the Born-Bethe law. Predictions on fluorescence yields in a very wide interval of electron energies (eV - GeV) and pressures (1 and 1013 hPa) as expected from laboratory measurements are presented. Experimental results at energies over 1 MeV are in very good agreement with our calculations for pure nitrogen while discrepancies of about 20% are found for dry air, very likely associated to uncertainties in the available data on quenching cross sections. The relationship between fluorescence emission, stopping power and deposited energy is discussed.

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