A surface acoustic wave oscillator-based modulator/mixer for frequency-modulated electron nuclear double resonance spectroscopy

Journal Article · Wed Oct 31 23:00:00 EST 1990 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1141583· OSTI ID:6057227

Clarkson, R B; Belford, R L; Reiner, C ^[1]

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1. Department of Chemistry, University of Illinois, Urbana, IL (USA) Illinois EPR Research Center, University of Illinois, Urbana, IL (USA)

A device is described that provides frequency modulation to the rf signal used in electron nuclear double resonance (ENDOR) spectroscopy. Its use results in excellent spectral (signal) baseline characteristics while allowing a digital frequency synthesizer to be employed as the source of the swept rf signal. The circuit makes use of a surface acoustic wave (SAW) oscillator as the voltage-controlled frequency source of the frequency modulation, as well as rf mixers and a 5th-order Butterworth filter to produce a spectrally clean modulated frequency output. Provision for the input of a second rf frequency for TRIPLE resonance experiments also is provided. The device can be used in any frequency range with good results, as spectra from {ital X}- and {ital Q}-band ENDOR systems illustrate.

• OSTI ID: 6057227
• Journal Information: Review of Scientific Instruments; (USA), Journal Name: Review of Scientific Instruments; (USA) Vol. 61:11; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
DESIGN
ENDOR
FREQUENCY MODULATION
FREQUENCY RANGE
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MHZ RANGE
MIXERS
MODULATION
NEUTRON SPECTROMETERS
OSCILLATIONS
RESONANCE
SAWTOOTH OSCILLATIONS
SPECTROMETERS