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The article presents information on a system that tracks moving nanoparticles in three dimensions. The system also provides spectroscopic measurements. The apparatus has been described by the researchers led by Haw Yang at the University of California, Berkeley, California and Lawrence Berkeley National Laboratory. The researchers demonstrated the system by monitoring an individual gold nanoparticle in solution. They used a green laser beam to collect the spectroscopic information. The system is noninvasive and has a spatial resolution of more than 210 nanometer.

Reports on the new vibrational spectroscopy tool developed by researcher Richard Mathies and colleagues at the University of California, Berkeley, for studying structural changes during ultrafast chemical and biological reactions as of September 2003. Information about the Femtosecond stimulated Raman spectroscopy; Commonly used techniques for examining structural changes on femtosecond timescales; Demonstration of the new technique by Mathies and colleagues.