Authentication and testing of banknotes using laser multiphoton electron extraction spectroscopy (MEES)

Danny Fisher, Valery Bulatov, Israel Schechter*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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 counterfeit, have been tested. The results indicate that MEES spectra are both infor-mative (many peaks) and reproducible. The spectra allow for clear distinction between authentic and counterfeit banknotes. Actually, MEES provides a unique fingerprint of the banknotes, so that distinction between various forgery methods (printer used) is also possible.

Original languageEnglish
Article number10465
JournalApplied Sciences (Switzerland)
Volume11
Issue number21
DOIs
StatePublished - 1 Nov 2021

Keywords

  • Authentication
  • Banknotes
  • Ionization
  • Laser
  • MEES

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