77Se solid-state NMR investigations on AsxSe1−x glasses using CPMG acquisition under MAS

► CPMG on natural abundance 77Se glasses provides decisive S/N enhancement. ► CPMG helps detect NMR lines that would not be detected otherwise. ► J-coupling or unrefocused dipolar couplings influence the T2CPMG dimension. ► CPMG spectra may not be quantitative and Hahn echoes are therefore preferred. ► The “chains crossing model” is not perfect for the description of AsxSe1−x glasses.