P-TYPE GRADIENT-ENHANCED DQF-COSY EXPERIMENTS SHOW LOWER t1 NOISE THAN N-TYPE

Chinese Journal of Magnetic Resonance ›› 1999, Vol. 16 ›› Issue (1): 13-20.

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P-TYPE GRADIENT-ENHANCED DQF-COSY EXPERIMENTS SHOW LOWER t₁ NOISE THAN N-TYPE

Lin Guoxing^1,2, Liao Xinli^1,2, Lin Donghai^1,2, Zheng Shaokuan², Chen Zhong^1,2, Wu Qinyi^1,2

Department of Chemistry, Xiamen University, Xiamen 361005

Received:1998-09-21 Revised:1998-12-03 Published:1999-02-05 Online:2018-01-11
Supported by:
This project was supported by the National Natural Science Foundation of China(19605004)and State Key Laboratory for Physical Chemistry of the Solid Surface

Abstract

Abstract: t₁ noise, stemming from the instabilities of pulse phases in 2D spectroscopy, has been investigated theoretically as well as experimentally. Based on the angular momentum operator I_x,I_y,I_z formalism, our deductions show that the different precessing directions of the magnetization between P-type and N-type gradient enhanced DQF-COSY experiments result in that P-type gradient enhanced DQF-COSY experiments refocus the phase errors of pulses, while N-type gradient enhanced DQF-COSY experiments strengthen the effect of the phase errors of pulses. Therefore, t₁ noise in P-type gradient enhanced DQF-COSY experiments is lower than that in N-type. In addition, the theoretical ratio of P-type to N-type is √3:√11, which is supported by our experimental results.

Key words: NMR, DQF-COSY, PFG, Product operator, t₁ noise

Lin Guoxing, Liao Xinli, Lin Donghai, Zheng Shaokuan, Chen Zhong, Wu Qinyi. P-TYPE GRADIENT-ENHANCED DQF-COSY EXPERIMENTS SHOW LOWER t₁ NOISE THAN N-TYPE[J]. Chinese Journal of Magnetic Resonance, 1999, 16(1): 13-20.

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P-TYPE GRADIENT-ENHANCED DQF-COSY EXPERIMENTS SHOW LOWER t₁ NOISE THAN N-TYPE

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