Light Scattering

The LS Spectrometer by LS Instruments is a shared instrument located in LRSM 10. It can operate in both static light scattering (SLS) and dynamic light scattering (DLS) modes.

The instrument is equipped with a 3D Cross-correlation capability that enables it to distinguish intensity decorrelation that originates from single vs multiple scattering events. As a result, the instrument can be used to collect dynamic light scattering data from samples that exhibit multiple scattering, i.e. concentrated, opaque systems. The Modulated 3D Cross-Correlation option enhances the signal from the cross-correlation measurement. Additional options include sample rotation (for measurements of non-ergodic systems), and temperature resolved measurements.

Standard measurements:

  • Particle sizing: hydrodynamic Radius (Rh) and radius of gyration (Rg)
  • Size distribution and polydispersity
  • Particle dynamics: diffusion coefficient, mean square displacement,
  • Polymer molecular weight (MW ~ 360 – 3600000 Dalton)
  • 2nd virial coefficient
  • Rayleigh ratio
  • Form and structure factors
  • Inter-particle distance in charged systems
  • Aggregation
  • Etc.


Sample volume50 μL to 4 ml
Particle size range (Rh)0.15 nm to 5 μm
Radius of gyration (Rg)5 nm to 5 μm
Molecular weight360 – 3,600,000 Dalton
Angular range12° to 150° (+/- 0.01°)
Recommended 15° to 150°
LaserFiber-coupled laser 120 mW, 638 nm
Correlator320 channels, delay time 12.5 ns to 15 h,
auto- and cross-correlation
Temperatureup to 90 °C

For light scattering tutorials: