Abstract
We present a new technique for a microwave pulse modulator that generates a short microwave pulse of approximately 1 ns for use in an electron paramagnetic resonance (EPR) spectrometer. A quadruple-frequency multiplier that generates a signal of 16-20 GHz from an input of 4-5 GHz 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 1.6 mT using 80° pulses of 1.5 ns.
Original language | English |
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Pages (from-to) | 1-6 |
Number of pages | 6 |
Journal | Journal of Magnetic Resonance |
Volume | 191 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2008 Mar |
Externally published | Yes |
Keywords
- Excitation bandwidth
- Frequency multiplier
- PIN diode switch
- Pulsed EPR
ASJC Scopus subject areas
- Biophysics
- Biochemistry
- Nuclear and High Energy Physics
- Condensed Matter Physics