POSSIBILITIES OF APPLYING THE RAMAN SPECTROSCOPY METHOD FOR SOLVING TOPICAL ISSUES OF TECHNICAL EXAMINATION OF DOCUMENTS

Abstract

he purpose of the paper is to obtain the new results as experimentally confirmed conclusions for broaden analytical potential of technical examination of documents by Raman spectroscopy. Methodology. The reliability of the
results and conclusions is ensured by using a number of scientific approaches, in particular the testing a series of dated
line samples, the methods of observing, measuring and comparing the Raman signal intensities as well as true logic
(analysis, synthesis, induction, deduction etc.) and specific research methods: computational, chemical, physical and
physico-chemical ones applied for experimental testing and analysis the results. In addition, there are few forms of
knowledge as concepts, laws, hypotheses, theories are used, which allow to apply them further, receiving scientific approbation. Scientific novelty. The efficiency of Raman spectroscopy for forensic technical examination of documents
is approved experimentally (systematic studies of ballpoint pen lines, imprints of seals and stamps to identify the dye
composition of inks, comparative analysis of Raman spectra of unknown inks and pure crystalline dyes, which are
subjected to similar physical and physicochemical changes) and broadening, which expands the analytical potential of
this type of examination. Conclusions. The group characteristics of the dyes of ballpoint pen inks are determined experimentally using a method of Raman spectroscopy assisted with DXR Raman Microscopy. It was stated out Raman
spectroscopy studies, in comparison with similar FTIR spectroscopy, is not required for sample pretreatment stage.
Structure and group characteristics of dyes have been differentiated, which provide the possibilities to determine fake
elements in original documents. The sequences of applying the text made of electrophotographic or inkjet printing
technique and the signature made of ballpoint pen ink is precisely determined by microscope set of Raman spectrometer. Possibilities of technical examination of documents are outlined in aspect of applying Raman spectroscopy
technique