Spin dynamics of half-integer NQR echoes

A spin-independent whole theoretical treatment of nuclear quadrupole resonance echoes of half-integer spin systems with zero asymmetry parameter is presented. It is shown that the expression of both Hahn and Solid echoes are identical up to the second order for all half-integer spins, also that the separate measurement of homonuclear and quadrupole–heteronuclear broadening is possible by means of mixed echoes techniques.