Pulsed Orotron—A new microwave source for submillimeter pulse high-field electron paramagnetic resonance spectroscopy

A vacuum-tube device for the generation of pulsed microwave radiation in the submillimeter range (up to 380  GHz ) is presented, designed for use as a source in a 360  GHz high-field/high-frequency electron paramagnetic resonance (EPR) spectrometer—the pulsed Orotron. Analogous to the known continuo...

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Bibliographic Details
Published in:Review of scientific instruments 2004-09, Vol.75 (9), p.2926-2936
Main Authors: Grishin, Yu. A., Fuchs, M. R., Schnegg, A., Dubinskii, A. A., Dumesh, B. S., Rusin, F. S., Bratman, V. L., Möbius, K.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DIFFRACTION GRATINGS
ELECTRIC POTENTIAL
ELECTRON BEAMS
ELECTRON SPECTROSCOPY
ELECTRON SPIN RESONANCE
EPR SPECTROMETERS
FREE ELECTRON LASERS
GHZ RANGE 100-1000
MAGNETIC FIELDS
MICROWAVE RADIATION
POLYCRYSTALS
PULSES
RESONATORS
SCANNING ELECTRON MICROSCOPY
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Summary:A vacuum-tube device for the generation of pulsed microwave radiation in the submillimeter range (up to 380  GHz ) is presented, designed for use as a source in a 360  GHz high-field/high-frequency electron paramagnetic resonance (EPR) spectrometer—the pulsed Orotron. Analogous to the known continuous wave (cw) version, in the pulsed Orotron microwave radiation is generated by the interaction of a nonrelativistic electron beam with a diffraction grating (stimulated Smith–Purcell radiation) in feedback with an open Fabry–Pérot resonator construction. The presented design extends the cw Orotron by a gate electrode and a high-voltage pulsing unit to control the electron beam current. The generated pulses at 360  GHz have pulse lengths from 100  ns –10 μ s and a pulse power of (22±5)  mW . The output in a broader frequency band between 320 and 380  GHz ranges from 20 up to 60  mW . Within a 10 μ s time slot, incoherent pulse trains of arbitrary duration can be generated. The pulsed Orotron has been incorporated in the quasioptical microwave bridge of a heterodyne induction mode EPR spectrometer. The first free induction decay measurements at a microwave frequency of 360  GHz and a magnetic field of 12.8  T on a polycrystalline perylenyl–ion sample are presented and future applications and extensions of Orotron-EPR spectroscopy are discussed.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1778071