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arXiv 1402.3580stat.APstat.MEstat.ML
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NMR光谱的贝叶斯推断及其在化学定量中的应用

Bayesian Inference for NMR Spectroscopy with Applications to Chemical Quantification

Andrew Gordon Wilson, Yuting Wu, Daniel J. Holland, Sebastian Nowozin, Mick D. Mantle, Lynn F. Gladden, Andrew Blake

摘要:

核磁共振(NMR)光谱利用原子核的磁性来发现分子的结构,反应状态和化学环境。我们提出了一个概率生成模型和推理程序的NMR光谱。具体来说,我们使用的三角函数进行指数衰减的加权和模型自由感应衰减(FID)信号。我们讨论了在估计这个一般模型的组件-振幅,相移,频率,衰减率和噪声方差-的挑战,并提供实际的解决方案。我们比较与传统的傅里叶变换光谱估计化学品在混合物中的相对浓度,使用合成和实验获得的FID信号。我们发现所提出的模型对低信噪比(SNR)和FID的傅里叶变换中的重叠峰特别鲁棒,从而能够进行准确的预测(例如,1%灵敏度),这是常规光谱学(5%灵敏度)无法实现的。

英文摘要:

Nuclear magnetic resonance (NMR) spectroscopy exploits the magnetic properties of atomic nuclei to discover the structure, reaction state and chemical environment of molecules. We propose a probabilistic generative model and inference procedures for NMR spectroscopy. Specifically, we use a weighted sum of trigonometric functions undergoing exponential decay to model free induction decay (FID) signals. We discuss the challenges in estimating the components of this general model -- amplitudes, phase shifts, frequencies, decay rates, and noise variances -- and offer practical solutions. We compare with conventional Fourier transform spectroscopy for estimating the relative concentrations of chemicals in a mixture, using synthetic and experimentally acquired FID signals. We find the proposed model is particularly robust to low signal to noise ratios (SNR), and overlapping peaks in the Fourier transform of the FID, enabling accurate predictions (e.g., 1% sensitivity at low SNR) which are not possible with conventional spectroscopy (5% sensitivity).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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