Authentication and Testing of Banknotes Using Laser Multiphoton Electron Extraction Spectroscopy (MEES)

Authentication and Testing of Banknotes Using Laser Multiphoton Electron Extraction Spectroscopy (MEES)

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In laser multiphoton electron extraction spectroscopy (MEES), the photo-charges extracted from a surface by a pulsed laser beam are recorded as a function of laser wavelength.We report the first application of this spectroscopy to banknotes.Various banknotes from different countries, authentic and copyright, hellfire sloe gin have been tested.

The results indicate that MEES spectra are both informative (many peaks) and reproducible.The spectra allow for clear distinction between authentic and copyright banknotes.Actually, MEES provides a unique here fingerprint of the banknotes, so that distinction between various forgery methods (printer used) is also possible.