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  • Title: A new pulse width reduction technique for pulsed electron paramagnetic resonance spectroscopy.
    Author: Ohba Y, Nakazawa S, Kazama S, Mizuta Y.
    Journal: J Magn Reson; 2008 Mar; 191(1):1-6. PubMed ID: 18248828.
    Abstract:
    We present a new technique for a microwave pulse modulator that generates a short microwave pulse of approximately 1ns for use in an electron paramagnetic resonance (EPR) spectrometer. A quadruple-frequency multiplier that generates a signal of 16-20GHz from an input of 4-5GHz was employed to reduce the rise and fall times of the pulse prepared by a PIN diode switch. We examined the transient response characteristics of a commercial frequency multiplier and found that the device can function as a multiplier for pulsed signal even though it was designed for continuous wave operation. We applied the technique to a Ku band pulsed EPR spectrometer and successfully observed a spin echo signal with a broad excitation bandwidth of approximately 1.6mT using 80 degrees pulses of 1.5ns.
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