A frequency-swept, longitudinal detection EPR system for measuring short electron spin relaxation times at ultra-low fields

Xueyan Tang; Steven Suddarth; Saurin Kantesaria; Michael Garwood

doi:10.1016/j.jmr.2022.107279

A frequency-swept, longitudinal detection EPR system for measuring short electron spin relaxation times at ultra-low fields

Xueyan Tang, Steven Suddarth, Saurin Kantesaria, Michael Garwood

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

A frequency-swept longitudinal detection (LOD) EPR system is described for ultra-low field spectroscopy and relaxometry. With the capability of performing simultaneous transmit and receive with −80 dB isolation, this LOD-EPR can capture signals with decay constants in the nanosecond range and in theory even sub-nanosecond range, at fields close to the earth's magnetic field. The theoretical principles underlying this LOD-EPR are based on a fictitious field that accounts for the Z-axis magnetization polarized by a radiofrequency field alone. The electron spin relaxation time is obtained directly from a previously derived equation that describes the relationship between the relaxation time and the spectral peak position. Herein, the first frequency-swept LOD-EPR system is described in detail, along with experimental measurements of the short relaxation time (∼30 ns) of the free radical, 2,2-diphenyl-1-picrylhydrazyl, at zero to low field.

Original language	English (US)
Article number	107279
Journal	Journal of Magnetic Resonance
Volume	342
DOIs	https://doi.org/10.1016/j.jmr.2022.107279
State	Published - Sep 2022

Bibliographical note

Funding Information:
This research has been supported by the National Institutes of Health [grants U01 EB025153 and P41 EB027061], and the Malcolm B. Hanson Endowed Chair in Radiology. The authors would like to thank Steven Jungst, Jerahmie Radder, and Russell Lagore for their technical support. We are also grateful to Efraín Torres and Lance DelaBarre for valuable discussions and their inspiring thoughts.

Publisher Copyright:
© 2022 Elsevier Inc.

Keywords

Electron spin relaxation time
Frequency-swept EPR
Longitudinal detection
Simultaneous transmit and receive
Spectroscopy

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10.1016/j.jmr.2022.107279

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title = "A frequency-swept, longitudinal detection EPR system for measuring short electron spin relaxation times at ultra-low fields",

abstract = "A frequency-swept longitudinal detection (LOD) EPR system is described for ultra-low field spectroscopy and relaxometry. With the capability of performing simultaneous transmit and receive with −80 dB isolation, this LOD-EPR can capture signals with decay constants in the nanosecond range and in theory even sub-nanosecond range, at fields close to the earth's magnetic field. The theoretical principles underlying this LOD-EPR are based on a fictitious field that accounts for the Z-axis magnetization polarized by a radiofrequency field alone. The electron spin relaxation time is obtained directly from a previously derived equation that describes the relationship between the relaxation time and the spectral peak position. Herein, the first frequency-swept LOD-EPR system is described in detail, along with experimental measurements of the short relaxation time (∼30 ns) of the free radical, 2,2-diphenyl-1-picrylhydrazyl, at zero to low field.",

keywords = "Electron spin relaxation time, Frequency-swept EPR, Longitudinal detection, Simultaneous transmit and receive, Spectroscopy",

author = "Xueyan Tang and Steven Suddarth and Saurin Kantesaria and Michael Garwood",

note = "Funding Information: This research has been supported by the National Institutes of Health [grants U01 EB025153 and P41 EB027061], and the Malcolm B. Hanson Endowed Chair in Radiology. The authors would like to thank Steven Jungst, Jerahmie Radder, and Russell Lagore for their technical support. We are also grateful to Efra{\'i}n Torres and Lance DelaBarre for valuable discussions and their inspiring thoughts. Publisher Copyright: {\textcopyright} 2022 Elsevier Inc.",

year = "2022",

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doi = "10.1016/j.jmr.2022.107279",

language = "English (US)",

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AU - Tang, Xueyan

AU - Suddarth, Steven

AU - Kantesaria, Saurin

AU - Garwood, Michael

N1 - Funding Information: This research has been supported by the National Institutes of Health [grants U01 EB025153 and P41 EB027061], and the Malcolm B. Hanson Endowed Chair in Radiology. The authors would like to thank Steven Jungst, Jerahmie Radder, and Russell Lagore for their technical support. We are also grateful to Efraín Torres and Lance DelaBarre for valuable discussions and their inspiring thoughts. Publisher Copyright: © 2022 Elsevier Inc.

PY - 2022/9

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N2 - A frequency-swept longitudinal detection (LOD) EPR system is described for ultra-low field spectroscopy and relaxometry. With the capability of performing simultaneous transmit and receive with −80 dB isolation, this LOD-EPR can capture signals with decay constants in the nanosecond range and in theory even sub-nanosecond range, at fields close to the earth's magnetic field. The theoretical principles underlying this LOD-EPR are based on a fictitious field that accounts for the Z-axis magnetization polarized by a radiofrequency field alone. The electron spin relaxation time is obtained directly from a previously derived equation that describes the relationship between the relaxation time and the spectral peak position. Herein, the first frequency-swept LOD-EPR system is described in detail, along with experimental measurements of the short relaxation time (∼30 ns) of the free radical, 2,2-diphenyl-1-picrylhydrazyl, at zero to low field.

AB - A frequency-swept longitudinal detection (LOD) EPR system is described for ultra-low field spectroscopy and relaxometry. With the capability of performing simultaneous transmit and receive with −80 dB isolation, this LOD-EPR can capture signals with decay constants in the nanosecond range and in theory even sub-nanosecond range, at fields close to the earth's magnetic field. The theoretical principles underlying this LOD-EPR are based on a fictitious field that accounts for the Z-axis magnetization polarized by a radiofrequency field alone. The electron spin relaxation time is obtained directly from a previously derived equation that describes the relationship between the relaxation time and the spectral peak position. Herein, the first frequency-swept LOD-EPR system is described in detail, along with experimental measurements of the short relaxation time (∼30 ns) of the free radical, 2,2-diphenyl-1-picrylhydrazyl, at zero to low field.

KW - Electron spin relaxation time

KW - Frequency-swept EPR

KW - Longitudinal detection

KW - Simultaneous transmit and receive

KW - Spectroscopy

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A frequency-swept, longitudinal detection EPR system for measuring short electron spin relaxation times at ultra-low fields

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