Volume 117, Issue 13, 01 October 2002
Index of content:
Electronic confinement of organic molecules in confined spaces: A spectroscopic study of loaded MCM-41117(2002); http://dx.doi.org/10.1063/1.1510116View Description Hide Description
Steady-state and dynamic spectroscopic studies have been given in support of the electronic confinement of 1 10-phenanthroline), within nanoporous MCM-41. The bathochromic shift of the 0-0 transitions, together with the shortening of the excited state lifetimes have been correlated with the reduction of the HOMO-LUMO band gap accompanying by the increased energies of the frontier orbitals. This trend indicates that the electronic confinement of organic molecules is indeed realized in larger cavities, such as nanocavities of MCM-41. The variations in the 0-0 transitions observed here have also been confirmed by theoretical calculations.
117(2002); http://dx.doi.org/10.1063/1.1510439View Description Hide Description
We experimentally demonstrate for the first time the existence of distinguishable contributions to hyper-Rayleigh scattering (HRS) intensities from Agnanoparticles arising from electric–dipole and electric–quadrupole plasmon resonances at the emitted wavelength. We show that these results can be successfully modeled using an electromagnetic theory of HRS which assumes a surface-induced nonlinear susceptibility. In addition, we show that simple angular distribution measurements may be used to determine the relative sizes of the dipole and quadrupole contributions.
Electron stimulated solvation and reaction of water, ammonia, and methane in nanoclusters adsorbed on solid Ar substrate117(2002); http://dx.doi.org/10.1063/1.1510741View Description Hide Description
Electron stimulated desorption of cations from and molecules adsorbed on the solid Ar surface has been investigated to explore the behavior of excess protons as well as proton transfer reactions in solvent. In a submonolayer coverage regime, cluster ions are ejected from and molecules in the form of solvated protons whereas fragmentation occurs preferentially for Reacted species assignable to methyl alcohol, formaldehyde, and formic acid are emitted in the protonated or hydrated form by electronic excitation of a nanocluster including or CO additives.