Suppressing Background 13C NMR Signal From the Probe Head by Phase Incremented Pulses

doi:10.11938/cjmr20192739

Abstract

Abstract: The background ¹³C NMR signal originated from the organic materials in the probe head cross-polarizes from ¹H nucleus to ¹³C nucleus. This background ¹³C NMR signal is very broad (δ_C 20~250) and accumulates as the sample signal accumulating. Hartman-Hahn cross polarization with phase-incremented pulses in the S spin channel (denoted as PIPCP) is developed to suppress this background signal. The application of PIPCP results in severe phase distortion outside the radio frequency coil such that the background ¹³C NMR signal cannot cross polarize and thus be suppressed. In comparison, depending on the dipolar coupling constant between ¹H and ¹³C nuclei, PIPCP induces only a small amount of Hartman-Hahn mismatch (1.4%) to the desired signals.

Key words: solid-state nuclear magnetic resonance, background signal suppression, phase incremented pulses, cross polarization

CLC Number:

O657.61

WEI Ling, ZHANG Shan-min. Suppressing Background ¹³C NMR Signal From the Probe Head by Phase Incremented Pulses[J]. Chinese Journal of Magnetic Resonance, 2020, 37(1): 123-130.

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Suppressing Background ¹³C NMR Signal From the Probe Head by Phase Incremented Pulses

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