is well established that as an insulator, defects in diamond may exist in more than one charge state in the same crystal simultaneously. For charge states which are dominated by the charge dynamics of nitrogen donors (the dominant impurity in the majority of synthetic diamond), a “charge transfer” protocol has been established to drive between the two extremal states [@DHaenens-Johansson2011; @Khan2009; @Khan2013]. Above-band-gap UV excitation ([$\lambda\SI{<225}{\nano\meter}$]{}) of a sample typically maximizes the concentration of nitrogen donors, [$\mathrm{N_{s}^{0}}$]{}, which in turn tends to favor the neutral charge state of other defects. Heating the sample at in the absence of light enables thermal excitation of electrons/holes, reversing the process and yielding [$\mathrm{N_{s}^{+}}$]{} while typically maximizing the concentrations of negatively-charged versions of defects present. This has been previously demonstrated in several defects including [$\mathrm{SiV}$]{}[@DHaenens-Johansson2011], [$\mathrm{NV}$]{} [@Maki2011], [$\mathrm{NVH}$]{}[@Khan2009], [$\mathrm{N_{2}V}$]{} [@Dale2015], and [$\mathrm{N}_{3}\mathrm{V}$]{}[@Green2017].

This charge instability can be a great advantage when studying fundamental defect properties as it enables multiple charge states of the same defect to be studied in the same crystal. In a single-electron charge transfer process (e.g. [[${}^{}\mathrm{X^{0}}$]{}]{}to [[${}^{}\mathrm{X^{-}}$]{}]{}rather than [[${}^{}\mathrm{X^{+}}$]{}]{}to [[${}^{}\mathrm{X^{-}}$]{}]{}for a given defect X), we expect at least one of the charge states to be EPR-active. EPR is capable of 