A theoretical study on effects of electron spin relaxation in pulsed nutation experiments for a quartet state in liquid solution

An effect of spin relaxation on electron spin nutation was analyzed theoretically for a quartet state in liquid solution. Modulation of zero-field interactions by random rotational motion is considered as a source of electron spin relaxation under an assumption of a short correlation time. We solved the quantum mechanical equation of motion under a nutation pulse and calculated a nutation spectrum. The results showed that the nutation frequency was strongly affected by spin relaxation. We discuss dependencies of several parameters, such as a rotational correlation time, a microwave field intensity and frequency, and a zero-field interaction on nutation frequency.