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Title: Toroid cavities as NMR detectors in high pressure probes

Abstract

A cylindrical toroid cavity has been developed for application as an NMR detector for high sensitivity and high resolution spectroscopy in metal vessel probes. Those probes are used for in situ investigations at high temperature and pressure. Since the transmitted r.f. field is completely confined within the torus, the cavity can be placed inside the pressurized system without magnetic coupling to the metal vessel. Resonance frequencies up to 400 MHz make the toroid cavity detector especially suited for use in {sup 1}H and {sup 19}F spectroscopy. Typically achieved static {sup 1}H linewidths, measured on CHCl{sub 3} using cavities in Be-Cu pressure vessels, are 2.0 Hz. On the basis of theoretical considerations that include the radial dependence of the r.f. field within cylindrical or circular toroid detectors, equations were evolved to predict the signal intensity as a function of the pulse width. The equations precisely describe the deviations from the sinusoidal approximation, which is generally used for signal intensities derived from Helmholtz or solenoid coils.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10176159
Report Number(s):
ANL/CMT/PP-79364
ON: DE94016886; TRN: 94:007767
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Mar 1993
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; NUCLEAR MAGNETIC RESONANCE; PROBES; DESIGN; TOROIDAL CONFIGURATION; LINE WIDTHS; MATHEMATICAL MODELS; 440800; MISCELLANEOUS INSTRUMENTATION

Citation Formats

Woelk, K, Rathke, J W, and Klingler, R J. Toroid cavities as NMR detectors in high pressure probes. United States: N. p., 1993. Web. doi:10.2172/10176159.
Woelk, K, Rathke, J W, & Klingler, R J. Toroid cavities as NMR detectors in high pressure probes. United States. https://doi.org/10.2172/10176159
Woelk, K, Rathke, J W, and Klingler, R J. 1993. "Toroid cavities as NMR detectors in high pressure probes". United States. https://doi.org/10.2172/10176159. https://www.osti.gov/servlets/purl/10176159.
@article{osti_10176159,
title = {Toroid cavities as NMR detectors in high pressure probes},
author = {Woelk, K and Rathke, J W and Klingler, R J},
abstractNote = {A cylindrical toroid cavity has been developed for application as an NMR detector for high sensitivity and high resolution spectroscopy in metal vessel probes. Those probes are used for in situ investigations at high temperature and pressure. Since the transmitted r.f. field is completely confined within the torus, the cavity can be placed inside the pressurized system without magnetic coupling to the metal vessel. Resonance frequencies up to 400 MHz make the toroid cavity detector especially suited for use in {sup 1}H and {sup 19}F spectroscopy. Typically achieved static {sup 1}H linewidths, measured on CHCl{sub 3} using cavities in Be-Cu pressure vessels, are 2.0 Hz. On the basis of theoretical considerations that include the radial dependence of the r.f. field within cylindrical or circular toroid detectors, equations were evolved to predict the signal intensity as a function of the pulse width. The equations precisely describe the deviations from the sinusoidal approximation, which is generally used for signal intensities derived from Helmholtz or solenoid coils.},
doi = {10.2172/10176159},
url = {https://www.osti.gov/biblio/10176159}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {3}
}