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Pulsed ESR experiments are reported for ensembles of negatively-chargednitrogen-vacancy centers (NV$^-$) in diamonds at X-band magnetic fields(280-400 mT) and low temperatures (2-70 K). The NV$^-$ centers in synthetictype IIb diamonds (nitrogen impurity concentration $<1$~ppm) are prepared withbulk concentrations of $2\cdot 10^{13}$ cm$^{-3}$ to $4\cdot 10^{14}$ cm$^{-3}$by high-energy electron irradiation and subsequent annealing. We find that aproper post-radiation anneal (1000$^\circ$C for 60 mins) is criticallyimportant to repair the radiation damage and to recover long electron spincoherence times for NV$^-$s. After the annealing, spin coherence times of T$_2= 0.74$~ms at 5~K are achieved, being only limited by $^{13}$C nuclear spectraldiffusion in natural abundance diamonds. At X-band magnetic fields, strongelectron spin echo envelope modulation (ESEEM) is observed originating from thecentral $^{14}$N nucleus. The ESEEM spectral analysis allows for accuratedetermination of the $^{14}$N nuclear hypefine and quadrupole tensors. Inaddition, the ESEEM effects from two proximal $^{13}$C sites (second-nearestneighbor and fourth-nearest neighbor) are resolved and the respective $^{13}$Chyperfine coupling constants are extracted.

Spin Coherence and $^{14}$N ESEEM Effects of Nitrogen-Vacancy Centers in Diamond with X-band Pulsed ESR