Microtesla NMR J-coupling spectroscopy with an unshielded atomic magnetometer

Area of Science:

• Physics
• Chemistry
• Spectroscopy

Background:

• Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful analytical technique.
• Traditional NMR requires strong, shielded magnetic fields, limiting its applications.
• Ultra-low-field NMR (ULF-NMR) offers potential advantages but faces sensitivity and complexity challenges.

Purpose of the Study:

• To present experimental data and theoretical interpretation of NMR spectra.
• To demonstrate NMR detection in an unshielded environment using a differential atomic magnetometer.
• To analyze complex NMR spectra in an ultra-low magnetic field regime.

Main Methods:

• Utilizing a differential atomic magnetometer for sensitive detection.
• Performing measurements in an unshielded environment.
• Conducting experiments in an ultra-low magnetic field regime.
• Analyzing spectra where J-coupling and Zeeman energies are comparable.

Main Results:

• Successful detection of NMR spectra from remotely magnetized samples.
• Demonstration of NMR measurements in an unshielded environment.
• Satisfactory interpretation of complex spectral line sets.
• Validation of theoretical models for ULF-NMR spectra.

Conclusions:

• Differential atomic magnetometers enable NMR detection in unshielded environments.
• The developed methods allow for the interpretation of complex ULF-NMR spectra.
• This work expands the possibilities for NMR applications in challenging settings.