Electron paramagnetic resonance (EPR, also known as electron spin resonance, ESR) is a spectroscopic method for studying compounds—synthetic or biological—that contain unpaired electrons (radicals, metal centres, spin labels, defects, etc.). The unpaired electron spins can be excited in an applied magnetic field, producing resonance signals whose features (g-values, hyperfine splitting, line widths, relaxation behaviour) report on the local electronic environment, structure, dynamics, and interactions. Because EPR is non-invasive, it is also possible to perform in situ and even in vivo measurements (e.g. sensing O2, NO, radicals in biological systems), as well as mechanistic monitoring of radical reactions or spin probes in chemical and biochemical systems.
Key features
- High-sensitivity X-band CW EPR spectrometer
Operation in the X-band microwave region (9.0–9.9 GHz) provides highly sensitive continuous-wave EPR detection suitable for a wide range of solid and liquid samples. - Excellent absolute sensitivity
An absolute sensitivity of approximately 1 × 10¹⁰ spins / (1 G Hz) enables reliable detection of dilute or weakly paramagnetic systems. - Flexible magnetic field modulation and sweep range
Adjustable field modulation frequency from 100 Hz to 100 kHz and magnetic field sweep up to 2.0 T (20,000 G) ensure precise control across diverse experimental regimes. - Variable-temperature operation
A variable-temperature unit using nitrogen gas allows experiments over a broad temperature range of approximately 90 K to 600 K, covering cryogenic to elevated-temperature conditions.
The Edinburgh Instruments FLS1000 Research Fluorimeter is a state-of-the-art modular spectrometer for steady-state and time-resolved photoluminescence (PL) measurements. It enables comprehensive characterization of emissive materials across a broad spectral range (230–1000 nm), supporting both liquid and solid samples under variable temperature conditions (77–300 K).
The system is fully computer-controlled via Fluoracle software, providing automated spectral correction, lifetime analysis, and quantum yield determination. The FLS1000 is ideal for investigating photophysical processes in nanomaterials, photocatalysts, and hybrid systems.
Key features
- Light sources
450 W xenon lamp (230–1000 nm), microsecond xenon flashlamp (0.1–100 Hz)
405 nm 40 mW • 488 nm 20 mW • 640 nm 40 mW - Excitation/ Emission Monochromators
Double Czerny-Turner configuration, f/4, 325 mm focal length, stray light suppression >10⁸, 0.01 nm step size - Detection
Extended red PMT (200–980 nm), TE-cooled to –20 °C, dark count <100 cps - TCSPC electronics
Temporal resolution <25 ps, 2.5 ns–50 μs window, up to 8192 bins - Accessories
Integrating sphere for absolute quantum yield, LN₂ cryostat (77–300 K), thermostated cuvette holder, solid/powder holder
