ESEEM measurements with time-resolved detection of the entire ESE signal shape

In this work we discuss the extension of electron spin-echo envelope modula tion (ESEEM) measurements to the additional time dimension, the spin-echo c oordinate. The time-resolved acquisition of the entire spin-echo signal sha pe retains information on the dependence of the ESEEM amplitude on the posi tion within the ESE signal. Therefore, not only can such acquisition be com pletely substituted for the boxcar integration in ESEEM measurements, but i t can also improve the performance of the ESEEM experiments in terms of obt aining correct modulation amplitudes and a better signal/noise ratio. Imple menting such an acquisition in pulse-adjustable ESEEM measurements transfor ms these techniques into routine and convenient experiments used to increas e the modulation amplitude. (C) 2000 Academic Press.