Abstract
The design and operation of a relatively simple, yet versatile spectrometer for microwave–microwave double resonance (MMDR) studies is described. The system consists of a high-Q, semiconfocal Fabry–Perot cavity resonator which is crossed at right angles by a second free-space microwave beam. We excite the cavity with a low-power unmodulated signal source, while the free-space irradiation source is square-wave frequency modulated and is of moderately high power (several hundred milliwatts). Both microwave sources are scannable; the signal source is locked to the cavity while the pumping klystron is free running. The signal (cavity) frequency has been operated in the 15–40-GHz range, and pump frequencies can be selected and easily implemented above or below the signal microwave frequency.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
