Figure 1.

HYSCORE pulse sequence investigated in this work. The delay between the first and second π/2-pulses is held at a fixed value τ. The intensity of the inverted echo (dashed) is acquired as a function of t₁ and t₂, resulting in a 2D time-domain pattern correlating the change in nuclear resonant frequencies as the electron spin is flipped between its +1/2 and −1/2 spin states. All spectra were acquired with a 4-step phase cycle.¹⁴