Electron spin resonance of gamma, electron, neutron and fission fragments irradiated K₂SO₄

Solid adenine and seawater salts exposed to gamma radiation: An FT-IR and EPR spectroscopy analysis for prebiotic chemistry

“…However, this radical was very difficult to identify in our spectrum since it generates several resonance lines, and its intensity is much weaker than the one from SO3− [22]. Unlike SO3−, the SO4− radical is anisotropic, showing three g values [22, 23]. The SO4− can occupy two non-equivalent sites when present in K 2 SO 4 structure, [22].…”

“…Another species probably present is the SO4− radical. However, this radical was very difficult to identify in our spectrum since it generates several resonance lines, and its intensity is much weaker than the one from SO3− [22]. Unlike SO3−, the SO4− radical is anisotropic, showing three g values [22, 23].…”

“…In the spectrum of adenine plus seawater solution, the resonance at g = 2.004 is very likely due to SO3−. Among the radicals that could be formed after irradiation, SO3− appears in literature as the more intense, showing an isotropic spectroscopic factor of g = 2.0037 [22] and g = 2.0033 [15] for K 2 SO 4 and g = 2.004 for Na 2 SO 4 [23]. Although this radical shows the same g value as the radical of the solid obtained from distilled water solution, this does not necessarily means that it is the same radical.…”

“…Unlike SO3−, the SO4− radical is anisotropic, showing three g values [22, 23]. The SO4− can occupy two non-equivalent sites when present in K 2 SO 4 structure, [22]. In this case, instead three g values, we would recommend six.…”

“…The SO3− radical, as in the case of SO4−, shows an anisotropic g, both in K 2 SO 4 and in CaSO 4 [22, 23]. However, it was very difficult the identification, because of the salt mixture.…”