Measure T₂ with a train of spin echoes that refocus field inhomogeneity.
Checked against H. Y. Carr, E. M. Purcell, Phys. Rev. 94, 630–638 (1954), doi:10.1103/PhysRev.94.630; S. Meiboom, D. Gill, Rev. Sci. Instrum. 29, 688–691 (1958), doi:10.1063/1.1716296.
Process NMR spectra in NMRium and draw pulse sequences, from a library of standard experiments or column by column, and save both as figures that open again. The site needs JavaScript, because every spectrum and figure is handled in your browser.