“…Ultimately, this solid-state methodology can be effectively integrated with radioactive atoms or molecules housed within crystals. A number of experiments are progressing towards identifying the best conditions using a transparent crystal, ideal for optical pumping, which is either doped or stoichiometric for maximum density, and based on radioactive molecules, which provide high enhancement and co-magnetometry properties, along with a closed, separately aligned parity doublet [22,75,[97][98][99][100]. This illustrates the profusion of new developments in this area and presages exciting results.…”