Is the quartet due to ·CH3 and ·C2H5 or ·NH3+ in alkali feldspars?

The intensity of broad quartet signal often identified as methyl radical (·CH3) in alkali feldspars is enhanced by γ-irradiation. The average g factor and hyperfine A of the broad distorted signal are g = 2.0033 and A = 2.45 mT, respectively, and were previously identified as ·CH3 or ·C2H5. The intensity of the quartet signal is enhanced by two orders of the magnitude by hydrothermal experiments of Na-feldspars in NH3 atmosphere and therefore the signal was identified as ·NH3+ where the anisotropic hyperfine due to N (I = 1) is not observed due to broadening in the powdered spectrum.