A study of J-coupling spectroscopy using the Earth's field nuclear magnetic resonance inside a laboratory

Shu Hsien Liao; Ming Jye Chen; Hong Chang Yang; Shin Yi Lee; Hsin Hsien Chen; Herng Er Horng; Shieh Yueh Yang

doi:10.1063/1.3498895

A study of J-coupling spectroscopy using the Earth's field nuclear magnetic resonance inside a laboratory

Shu Hsien Liao, Ming Jye Chen, Hong Chang Yang^*, Shin Yi Lee, Hsin Hsien Chen, Herng Er Horng, Shieh Yueh Yang

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光電工程學士學位學程

研究成果: 雜誌貢獻 › 期刊論文 › 同行評審

16 引文斯高帕斯（Scopus）

摘要

In this paper, an instrumentation of the Earth's field nuclear magnetic resonance (EFNMR) inside a laboratory is presented. A lock-in analysis (LIA) technique was proposed to enhance the signal-to-noise ratio (SNR). A SNR of 137.8 was achieved in a single measurement for 9 ml tap water, and the LIA technique significantly enhanced the SNR to 188 after a 10-average in a noisy laboratory environment. The proton-phosphorus coupling in trimethyl phosphate ((CH₃O)₃PO) with J-coupling J [H,F] = (10.99±0.013) Hz has been demonstrated. The LIA technique improves the SNR, and a 2.6-fold improvement in SNR over that of the frequency-adjusted averaging is achieved. To reduce the noise in EFNMR, it was suggested that the LIA technique and the first order gradient shim be used to achieve a subhertz linewidth.

原文	英語
文章編號	104104
期刊	Review of Scientific Instruments
卷	81
發行號	10
DOIs	https://doi.org/10.1063/1.3498895
出版狀態	已發佈 - 2010 10月

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title = "A study of J-coupling spectroscopy using the Earth's field nuclear magnetic resonance inside a laboratory",

abstract = "In this paper, an instrumentation of the Earth's field nuclear magnetic resonance (EFNMR) inside a laboratory is presented. A lock-in analysis (LIA) technique was proposed to enhance the signal-to-noise ratio (SNR). A SNR of 137.8 was achieved in a single measurement for 9 ml tap water, and the LIA technique significantly enhanced the SNR to 188 after a 10-average in a noisy laboratory environment. The proton-phosphorus coupling in trimethyl phosphate ((CH3O)3PO) with J-coupling J [H,F] = (10.99±0.013) Hz has been demonstrated. The LIA technique improves the SNR, and a 2.6-fold improvement in SNR over that of the frequency-adjusted averaging is achieved. To reduce the noise in EFNMR, it was suggested that the LIA technique and the first order gradient shim be used to achieve a subhertz linewidth.",

author = "Liao, {Shu Hsien} and Chen, {Ming Jye} and Yang, {Hong Chang} and Lee, {Shin Yi} and Chen, {Hsin Hsien} and Horng, {Herng Er} and Yang, {Shieh Yueh}",

note = "Funding Information: This work was supported by the National Science Council of Taiwan under Grant No. NSC98-2752-M-002-003-PAE.",

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AU - Chen, Ming Jye

AU - Yang, Hong Chang

AU - Lee, Shin Yi

AU - Chen, Hsin Hsien

AU - Horng, Herng Er

AU - Yang, Shieh Yueh

N1 - Funding Information: This work was supported by the National Science Council of Taiwan under Grant No. NSC98-2752-M-002-003-PAE.

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N2 - In this paper, an instrumentation of the Earth's field nuclear magnetic resonance (EFNMR) inside a laboratory is presented. A lock-in analysis (LIA) technique was proposed to enhance the signal-to-noise ratio (SNR). A SNR of 137.8 was achieved in a single measurement for 9 ml tap water, and the LIA technique significantly enhanced the SNR to 188 after a 10-average in a noisy laboratory environment. The proton-phosphorus coupling in trimethyl phosphate ((CH3O)3PO) with J-coupling J [H,F] = (10.99±0.013) Hz has been demonstrated. The LIA technique improves the SNR, and a 2.6-fold improvement in SNR over that of the frequency-adjusted averaging is achieved. To reduce the noise in EFNMR, it was suggested that the LIA technique and the first order gradient shim be used to achieve a subhertz linewidth.

AB - In this paper, an instrumentation of the Earth's field nuclear magnetic resonance (EFNMR) inside a laboratory is presented. A lock-in analysis (LIA) technique was proposed to enhance the signal-to-noise ratio (SNR). A SNR of 137.8 was achieved in a single measurement for 9 ml tap water, and the LIA technique significantly enhanced the SNR to 188 after a 10-average in a noisy laboratory environment. The proton-phosphorus coupling in trimethyl phosphate ((CH3O)3PO) with J-coupling J [H,F] = (10.99±0.013) Hz has been demonstrated. The LIA technique improves the SNR, and a 2.6-fold improvement in SNR over that of the frequency-adjusted averaging is achieved. To reduce the noise in EFNMR, it was suggested that the LIA technique and the first order gradient shim be used to achieve a subhertz linewidth.

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A study of J-coupling spectroscopy using the Earth's field nuclear magnetic resonance inside a laboratory

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