X-band rapid-scan EPR of nitroxyl radicals

► X-band rapid scan EPR of dilute aqueous nitroxyl radical solutions. ► CW lineshapes were recovered by sinusoidal deconvolution. ► Increasing scan rate and higher B1, within the rapid scan regime, gives increased signal amplitude without power saturation. ► Rapid scan EPR of 15N-mHCTPO resulted in an increase in signal-to-noise per unit time relative to CW EPR.