Distance measurements across randomly distributed nitroxide probes from the temperature dependence of the electron spin phase memory time at 240Â GHz

► Spin bath quenching shows inter-electron distance dependence. ► Temperature dependence of phase memory time allows distances to be quantified. ► Distances out to 6.6 nm are resolved in randomly distributed spin probes. ► Dimensionality effects are observed in spin-labeled vesicles.