Laser induced fano scattering, electron- phonon coupling, bond length and phonon life time of α-Fe2O3 nanostructure
We have extensively studied the laser-induced Fano scattering, electron- phonon coupling, bond length and phonon lifetime of α-Fe2O3 nanostructure prepared through simple co-precipitation method. A noticeable red shift and an asymmetry have been observed in the phonon modes of the prepared α-Fe2O3 nanostructure. The traditional assessment of asymmetric broadening and a red shift in the Raman spectra of nanomaterial was due to the quantum confinement effect. In the present investigation, the red shift and the asymmetry in phonon modes of α-Fe2O3 nanostructure have been studied on the basis of its heating effect and Fano interference between the discrete phonon and the laser-induced electron plasma in the nanomaterial. The observed asymmetrical factors of A1g(1) and Eg(4) phonon modes were positive and negative respectively and is seen to be decreasing with laser power. Laser-induced surface temperature of the material have been studied using the Stokes/anti-Stokes method. Bond lengths of the Fe-O molecules present in the α-Fe2O3 nanomaterial were increased and the calculated Fröhlich interactions were decreased with laser energy.