If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Phase Dependence of Saturation Transfer EPR Signals and Estimated Rotational Correlation Times

$29.00 plus tax (Refund Policy)

Buy Article:


The second harmonic absorption out-of-phase signal (V2' mode) is usually observed in saturation transfer electron paramagnetic resonance spectroscopy to determine slow rotational correlation times. It is known that adjustment of 90° out-of-phase is critically important to detect accurate ST-EPR spectra. The digitized ST-EPR spectrometer using the Fourier transformation method developed by the authors has enabled determination of the phase dependence of ST-EPR signals simply by calculating V2' signals under the condition of various phase deviations from exactly 90° out-of-phase. The overall 90° out-of-phase accuracy of the present system was confirmed to be within 0.3°. Phase dependence of both the ST-EPR parameters and the correlation times estimated from them was quantitatively discussed. Conclusively, accuracy of phase-adjustment is required to be within ±0.5° for less than 10%, and ±2° or 3° for less than approximately 30% errors on the correlation times. For determination of correlation times the parameter L"/L provides better accuracy than the parameter C'/C, even if 90° out-of-phase is set with some phase deviation.

Keywords: Out-of-phase null, Rotational correlation time, Fourier transformation; Saturation transfer EPR

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702824638764

Affiliations: Department of Chemistry, Faculty of Science, The University of Tokyo, Hongo, Tokyo, 113, Japan

Publication date: March 1, 1982

More about this publication?
Related content



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more