1. G. L. Braglia, G. M. de’ Munari andG. Mambriani:Nuovo Cimento,43 130 (1966).
2. G. M. de’ Munari andG. Mambriani:A plant for handling and purifying xenon CNEN RT/FI (65) 6 (1965).
3. We can likely assume that the only excited level responsible for ELG is the 5p 56s metastable state of the xenon atom atε 1=8.31 eV above the ground state. In fact in we made an estimate of the probability that an electron has of gaining energy aboveε 1 up to the resonant level at 8.44 eV. It came out a very small probability at ourE/N values. Moreover the ELG light has been analysed and only a continuum spectrum has been found (J. P. Boutot:Thèse Docteur Spécialité, no. 250 (Toulouse, 1965);J. L. Teyssier:Thèse Docteur Physique, no. 252 (Toulouse, 1965)). This confirms the aforesaid estimate owing to the generally accepted hypothesis that the metastable levels disexcite through dimer formation, thus giving a continuum spectrum.
4. L. Koch:Thèse Ingenieur-Docteur, no. 620 (Paris, 1959);R. Henck:Thèse Docteur Physique (Strasbourg, 1966).
5. G. M. de’ Munari, F. Giusiano andG. Mambriani:Energy Losses and Ranges of α-Particles in Xenon, to be published.