“A so-called X-band klystron has a spectral band width of
about 8.8-9.6 GHz. This makes it impossible to continuously vary the wavelength similarly to optical
spectroscopy. It is therefore necessary to vary the magnetic field, until the quantum of the radar
waves fits between the field-induced energy levels.”
All in all, the paper was pretty ok to understand, but this part wasn’t all to clear to me. (end of 1-6)