Effect of frequency chirp on RYDMR spectrum in AWG-RYDMR system at low magnetic field.

[Display omitted] • Arbitrary Waveform Generator (AWG) based reaction control is demonstrated for the first time and named AWG-RYDMR. • The periodic chirping technique enhances the spin mixing efficiency by covering the hyperfine structure of the resonance frequencies. • Chirped RF irradiation enhances spin mixing more than single-frequency RF and is as efficient as low static magnetic fields (∼1 mT). Spin-correlated radical pairs (RPs) are crucial for understanding how magnetic fields influence reaction yield and spin polarization. Reaction Yield Detected Magnetic Resonance (RYDMR) enables the observation of oscillating magnetic field effects on reaction yield, linking radical pairs to subsequent reactions. This study introduces the use of an arbitrary waveform generator (AWG) in RYDMR experiments, termed AWG-RYDMR, focusing on low-field RYDMR and its impact on spin-mixing efficiency. It is demonstrated that frequency-modulated RF pulses enhance spin mixing compared to single-frequency pulses by accessing a broader range of resonant frequencies, thus paving the way for advanced electron spin and reaction control techniques. [ABSTRACT FROM AUTHOR]