Problems of Forensic Sciences 2001 Vol. 46 (XLVI) 335-344
RAMAN SPECTROSCOPY OF INK ON PAPER
Thomas ANDERMANN
Bundeskriminalamt, Wiesbaden, Germany
Streszczenie
Blue and black ballpoint pen as well as blue, black, green and red fluid inks on paper are examined by Raman spectroscopy. The quality of the Raman spectra is strongly dependent on the excitation wavelength. Therefore, two different spectrometers with different excitation wavelengths have been tested. In addition, Surface Enhanced Resonance Raman Spectroscopy (SERRS) was used. Application of SERRShelps to avoid fluorescence and enhance certain Raman signals. Because of the minute amount of reagent applied to the ink-line, this procedure may still be regarded as non-destructive. The resulting Raman spectra are compared and classified. Classification results are compared with a classification of the inks by thin layer chromatography. An evaluation of the results will show to what extent Raman spectroscopy may be useful in questioned document examination.
Słowa kluczowe
Raman spectroscopy; Ink; Document examination.