title: Ultrafast optical nonlinearity, electronic absorption, vibrational spectra and solvent effect studies of ninhydrin.
abstract: FT-IR, FT-Raman and UV-Vis spectra of the nonlinear optical molecule ninhydrin have been recorded and analyzed. The equilibrium geometry, bonding features, and harmonic vibrational wavenumbers have been investigated with the help of B3LYP density functional theory method. A detailed interpretation of the vibrational spectra is carried out with the aid of normal coordinate analysis following the scaled quantum mechanical force field methodology. Solvent effects have been calculated using time-dependent density functional theory in combination with the polarized continuum model. Natural bond orbital analysis confirms the occurrence of strong intermolecular hydrogen bonding in the molecule. Employing the open-aperture z-scan technique, nonlinear optical absorption of the sample has been studied in the ultrafast and short-pulse excitation regimes, using 100 fs and 5 ns laser pulses respectively. It is found that ninhydrin exhibits optical limiting for both excitations, indicating potential photonic applications.
authors.affiliation: Department of Physics, Bishop Moore College, Mavelikara, Alappuzha 690 110, Kerala, India. dsajand@gmail.com
authors.forename: D
authors.initials: D
authors.lastname: Sajan
authors.forename: T Uma
authors.initials: TU
authors.lastname: Devi
authors.forename: K
authors.initials: K
authors.lastname: Safakath
authors.forename: Reji
authors.initials: R
authors.lastname: Philip
authors.forename: Ivan
authors.initials: I
authors.lastname: Němec
authors.forename: M
authors.initials: M
authors.lastname: Karabacak
mesh_terms: D006863:Hydrogen-Ion Concentration; D008958:Models, Molecular; D009555:Ninhydrin / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D012997:Solvents; D009555:Ninhydrin