1. An enhanced photoemission spectroscopy (EPS) system to identify or quantify a substance comprising: an optical probe configured to perform at least three light or photoelectric processes simultaneously using at least one light source to illuminate a target with energy to invoke the at least three processes, wherein the processes include Raman scattering detection, fluorescence detection and spectral surface reflectance detection; an amplitude and wavelength calibrated (AWC) spectrometer within the optical probe having stored light source wavelength information, wherein the AWC spectrometer is configured to generate spectral data from each process and to calibrate the spectral data with the light source wavelength information; a computer coupled to the AWC spectrometer to access at least three data modules corresponding to each process, wherein the data modules are configured to analyze the calibrated spectral data from the at least three processes and derive target signatures for the target; a signature database to store signature data of known substances, wherein the target signatures are compared to the signature data; and a display to show results from the comparison between the target signatures and the signature data.