Articles you may be interested inQuantification of transition dipole strengths using 1D and 2D spectroscopy for the identification of molecular structures via exciton delocalization: Application to α-helices Method based on polarized infrared spectroscopy for the determination of the spatial orientation of transition dipole moments of a ferroelectric liquid crystal Multidimensional femtosecond spectroscopies of molecular aggregates and semiconductor nanostructures: The nonlinear exciton equations Modulation of the polarization state of incident light in reflection microspectroscopy is used to study locally the orientations of exciton transition dipole moments of fiberlike nanostructures of J-aggregates of pseudoisocyanine dyes. The lowest exciton state assumes a wide range of directions with respect to the long axis of the fibers, from parallel to perpendicular. This behavior is correlated with the onset of polariton-like character of the local reflectance spectra. The results imply that a new structural model has to be conceived to explain the observed phenomena.
Adsorption-rate spectra of an ethylene-on-zinc oxide system maintained at -70 and -20 °C were observed by the frequency response method at equilibrium pressures between 4 X 10"2 and 1.8 Torr. The pressure dependence of the spectra stemming from two kinds of surface species, termed III and II in an earlier paper, was interpreted in a five parameter model; a kinetic equation, (d/dt)Aj = /?a®P/Vs®(l -A¡) exp(-gjSj) -&d®lVs®0j exp(hjOj), was postulated for each individual surface species j, of which the amount is denoted by A¡ and the coverage 0j is defined as Aj/Ns®. All constants in the equation, fca®, Vji> 1VS®, g¡, and hj, were determined according to a theoretical procedure at each equilibrium temperature; a slight dependence of the constants on temperature was found and discussed with the Fermi-Dirac distribution for Aj(Te). Conclusions of hj » g¡ ~0 for both species indicate that repulsive forces acting between each kind of the admolecules affect the desorption rate but not the adsorption.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.