confOrganiser.com - Work: FORENSIC ANALYSIS OF COLORED MATERIALS IN THE FIELD OF LOW ENERGIES

FORENSIC ANALYSIS OF COLORED MATERIALS IN THE FIELD OF LOW ENERGIES

1. Vojkan Zorić, Megatrend univerzitet, Serbia
2. Jovana Zorić, Medicinski fakultet Univerziteta u Novom Sadu, Serbia

Experimental color analysis in the field of low energies was performed by the method of infrared spectrophotometry with Furie transformation (FT-IR), on a laboratory instrument brand "Thermo Fisher Scientific" model "Nexus 6700". Examined samples of colored materials were collected during forensic examinations of traces of paint from various criminal events in the territory of the Republic of Serbia, in the period from 1999-2009. years. As it is already known that each color, at certain wave numbers, has characteristic spectrograms (especially in a specific, middle infrared region), in order to obtain a certain law in the behavior of color spectrograms, an experiment was performed. Concrete spectrograms were obtained by recording experimental color samples. It has been shown experimentally that colors in irreversible processes give exponential distributions with different parameters. During the recording, the interval of the wave vectors ranged from 450 to 4000 cm-1, so the exponential distributions were made with the exponent type . As the interval of the wave vectors lies in the deep infrared region, it is concluded that the color molecules exchanged low-energy quanta in collisions with each other, which correspond to rotational energy levels or changes in the L-S interaction. The obtained results represent the most objective criterion for the identification of colored materials using experiments in the low-energy region, because the characteristic wavelengths are determined through the superposition of all individual exponential distributions.

Key words: Forensic analysis of colors; infrared spectrophotometry; distribution superposition.

Thematic field: SIMPOZIJUM A - Nauka materije, kondenzovane materije i fizika čvrstog stanja

Date: 26.06.2020.

Contemporary Materials 2020 - Savremeni Materijali


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