MagQu Gyrolyzer Desktop Teaching Nuclear Magnetic Resonance Spectrometer

Overview

The MagQu Gyrolyzer is a compact, benchtop nuclear magnetic resonance (NMR) spectrometer engineered exclusively for undergraduate and graduate-level physics, chemistry, and materials science education. Unlike high-field superconducting NMR systems, the Gyrolyzer operates at ultra-low magnetic fields—leveraging Earth’s geomagnetic field (≈0.25–0.65 G) as a baseline—and employs pulsed RF excitation to detect free induction decay (FID) signals from proton (¹H) and other spin-½ nuclei (e.g., ³¹P) in liquid-phase samples. Its core measurement principle is based on the Larmor precession equation: ω₀ = γ·B₀, where ω₀ is the resonant angular frequency, γ is the gyromagnetic ratio (a fundamental nuclear property), and B₀ is the total static magnetic field. By systematically varying the applied field via Helmholtz coils and recording corresponding resonance frequencies, students directly determine γ and quantify local geomagnetic field strength—transforming abstract quantum mechanics into quantitative, reproducible laboratory practice.

Key Features

• Ultra-low-field operation (0–3 G) enabling safe, open-access experiments without cryogens or shielding infrastructure
• Real-time FID acquisition with 12-bit ADC resolution and adjustable pulse width (1–100 µs) and repetition rate (1–10 Hz)
• Integrated Helmholtz coil system for precise, calibrated field modulation (±0.01 G resolution)
• USB 2.0 interface compatible with Windows 10/11 and macOS 12+; no proprietary drivers required
• Dedicated teaching software with live time-domain waveform display, FFT spectral preview, peak annotation, and linear regression tools for γ and B_earth extraction
• Robust aluminum chassis with vibration-damped base; designed for classroom durability and repeated student handling

Sample Compatibility & Compliance

The Gyrolyzer accepts standard 5–10 mL glass NMR tubes (OD 10 mm) containing aqueous or organic liquid samples—including deuterated solvents (e.g., D₂O, CDCl₃) for reference calibration. It supports direct observation of ¹H, ³¹P, ¹⁹F, and ¹³C (with sufficient natural abundance or enrichment). All hardware and software workflows comply with ASTM E2834-12 for instructional NMR methodology and align with IUPAC recommendations for undergraduate spectroscopy curricula. Data acquisition logs include timestamp, coil current, pulse parameters, and ambient temperature—supporting GLP-aligned lab notebook practices. While not FDA 21 CFR Part 11 certified (as intended for education, not regulated QC), audit trails are exportable in CSV/CSV+PNG format for instructor review.

Software & Data Management

The bundled Gyrolyzer Control Suite provides a streamlined, menu-driven interface with three operational modes: (1) Sweep Mode for field-dependent resonance mapping, (2) J-Coupling Mode for multiplet analysis, and (3) Relaxation Mode for qualitative T₂ estimation. Each experiment auto-generates a metadata-rich project folder containing raw FID binary files (.fid), processed spectra (.csv), annotated PNG plots, and an XML summary with instrument settings and user-entered sample IDs. Export options include IEEE-compliant .mat (MATLAB), .jcampdx (JCAMP-DX v5.01), and .mxf (NMR-ML subset) formats—ensuring compatibility with third-party analysis tools such as Mnova Edu, TopSpin Lite, or Python-based nmrglue workflows. No cloud dependency; all processing occurs locally.

Applications

• Gyromagnetic ratio determination: Linear fitting of f_res vs. B_coil yields γ with typical uncertainty < ±0.3% (validated against NIST SRM 1775 water reference)
• Local geomagnetic field quantification: Intercept analysis provides site-specific B_earth values traceable to NOAA NGDC models
• J-coupling constant measurement: Direct readout of ¹H–³¹P splitting in (CH₃)₃PO (Δν = 11.09 Hz at 1.13 G) introduces students to scalar coupling, bond topology, and Karplus relationships
• Relaxation behavior demonstration: Variable delay experiments illustrate transverse relaxation heterogeneity across solvent/solute systems
• RF pulse sequence fundamentals: Manual adjustment of π/2 and π pulses reinforces concepts of flip angle, coherence transfer, and signal phase

FAQ

Is the Gyrolyzer suitable for research-grade measurements?

No—it is purpose-built for pedagogical fidelity, not analytical precision. Its 0.01 G field resolution and 1.5–15 kHz bandwidth meet ASTM E2834-12 requirements for teaching but do not satisfy ISO/IEC 17025 validation criteria for quantitative analysis.

Can it detect solid-state samples?

Not directly. The instrument requires homogeneous liquid-phase samples to achieve adequate signal-to-noise ratio within its low-field regime. Suspensions or gels introduce excessive line broadening.

What safety certifications does it hold?

CE marked per EN 61010-1:2010 (Electrical Safety for Laboratory Equipment) and FCC Part 15 Class B (EMI compliance). No ionizing radiation hazard; maximum RF power output is < 10 mW.

Does it support multi-nucleus experiments beyond ¹H and ³¹P?

Yes—users may configure custom pulse frequencies for ¹⁹F (γ ≈ 40.05 MHz/T) and ¹³C (γ ≈ 10.71 MHz/T), though sensitivity is limited by natural abundance and thermal polarization at low fields.

How is calibration maintained?

Factory calibration of coil current-to-field conversion is stored in non-volatile memory. Users perform daily zero-field verification using distilled water; full recalibration is recommended annually or after mechanical shock.