ENDOR Frequencies at X-band^†

^† X-Band spectra are commonly observed in the region of 9.5GHz, and at a magnetic field of 0.345 tesla. Under these conditions the ENDOR frequencies for some common nuclei are shown to the left. Hydrogen,¹H, which has the largest magnetic moment of all stable nuclei (¹⁹F is second largest), thus occurs at the highest NMR frequency. Other EMR frequency bands give NMR positions in proportion to the ratio of the band frequency, hence Q-band ENDOR will be in the range up to 3.7 times the values in the table, putting ¹H at 53MHz.