Which factor is NOT a consideration when improving resolution in EPR?

When discussing factors that improve resolution in Electron Paramagnetic Resonance (EPR) spectroscopy, one key consideration is the impact of the frequency of the microwave radiation used in the experiment. Using lower microwave frequencies tends to result in broader linewidths, which actually reduces resolution. Higher frequencies, on the other hand, are generally associated with improved resolution due to reduced spin-spin interactions that broaden the spectral lines.

Reducing interactions between paramagnetic centers can significantly enhance resolution by minimizing overlapping signals that arise from nearby paramagnetic species. Likewise, increasing the magnetic field strength effectively sharpens the resonance features, resulting in better resolution by allowing for a more pronounced differentiation of energy levels in the paramagnetic centers.

Using pulsed EPR techniques is also advantageous, as these methods allow for the exploitation of the coherence properties of electron spins, which can further enhance the resolution through time-domain measurements and selective excitation of specific transitions.

Thus, the factor that does not contribute positively to improving resolution in EPR is the use of lower microwave frequencies, as these lead to broader signals rather than sharper, more easily resolved peaks.