Expanding the Applicability of Handheld Raman Spectroscopy

What people encounter in the real world are mixtures, maybe trace compounds, and they often have interferences from materials that fluoresce. The SERS spectra come from molecules that have absorbed chemically to the nanoparticles, and this provides or creates a shift in some of the Raman bands. The way most people think to overcome fluorescence is by changing the laser wavelength, either moving down into the deep ultraviolet, or up into the near infrared. Metrohm is a world-renowned manufacturer of high-precision instruments for chemical analysis.