Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering C. D. Southern, P. D. Brimicombe, S. D. Siemianowski, S. Jaradat, N. Roberts, V. Görtz, J. W. Goodby and H. F. Gleeson EPL, 82 5 (2008) 56001 Published online: 26 May 2008 DOI: 10.1209/0295-5075/82/56001