Raman spectroscopy measures the magnitudes and intensities of frequency shifts that occur because of the inelastic scattering of light from matter (1, 2). The observed shifts can be used to extract information on molecular structure and dynamics.In addition, important information can be obtained by measuring the change in the electric field orientation of the scattered light relative to that of the incident exciting light.The experiment is usually performed by illuminating a sample with a high-intensity light beam with a well-defined frequency and a single linear polarization (Figure 1); the scattered light is collected over some solid angle and measured to determine frequency, intensity, and polarization. The inelastic scattering