Vibrational Spectral Investigations of Cheque Paper Document in Forensic Science

The Fourier Transform Raman and infrared spectra of cheque paper document have been recorded and analyzed. The wavenumbers corresponding to normal modes of vibration of cellulose were calculated at HF/6‐31G(d) level for comparison with the cheque paper sample. The appearance of a carbonyl stretching band at 1654 cm−1 clearly shows that the cheque paper is subjected to ageing. The broadening of O–H stretching wavenumber confirms the presence of inter and intra molecular O–H⋯O Hydrogen bonds. Also the presence of Kaolin and Rosin are unambiguously identified.