Reactions have been observed between excited ions of carbon disulfide and carbon disulfide, water, iodine and ethylene. The ions CS3\ C,S,+, C2S3\ H2OS+, CSI+, SI+, C2H : iS+ and C2H4S+ are formed in these reactions. An additional contribution to the C2S2+ ion results from reaction of CS+ with CS2 • The reaction of I2+ with CS2 leads to the ion CS2I+. Reactions of excited molecular ions have al...

Transition probabilities are calculated for individual and multiplet lines between some excited states in neutral sodium by using the weakest bound electron potential model theory. In the determination of parameters required for calculation of transition probabilities, we employed numerical non-relativistic Hartree–Fock wave functions for expectation values of radii in all levels. The necessary...

A theory of Rydberg atom interactions is used to derive analytical forms for the spin-wave pair correlation function in laser-excited cold-atom vapors. This function controls the quantum statistics of light emission from dense, inhomogeneous clouds of cold atoms of various spatial dimensionalities. The results yield distinctive scaling behaviors on the microsecond time scale, including generali...

We report the observation of nonadiabatic excitations of single electrons in a quantum dot. Using a tunable-barrier single-electron pump, we have developed a way of reading out the excitation spectrum and level population of the dot by using the pump current as a probe. When the potential well is deformed at subnanosecond time scales, electrons are excited to higher levels. In the presence of a...

High-resolution absorption and laser-excited fluorescence studies of KY3F10:Er3+ core-only nanoparticles are presented. A total 49 crystal-field energy levels, distributed amongst 13 multiplets the Er3+ ion, have been deduced for C4v point group symmetry centre in this material. parametrized, single-electron calculation provides an excellent approximation to experimental data with optimized cry...

Recent advances in the synthesis of multicomponent nanocrystals have enabled the design of nanocrystal molecules with unique photophysical behavior and functionality. Here we demonstrate a highly luminescent nanocrystal molecule, the CdSe/CdS core/shell tetrapod, which is designed to have weak vibronic coupling between excited states and thereby violates Kasha's rule via emission from multiple ...

A nonequilibrium kinetic model is used for predicting the time evolution of the Li atom concentrations ~ground and excited states! in the plasma produced by excimer laser ablation of a LiNbO3 target. The model predicts a very high ionization degree ~;0.97! that agrees well with the one obtained experimentally ~;1!. These results together with the prediction of high ~and close to local thermodyn...

The ground and first excited states in 15F were studied in resonant elastic scattering using the thick sCH4d gas target method in inverse kinematics with a separated 14O beam. An analysis of the excitation functions of the elastic scattering was carried out with the potential model. The quantum numbers 1/2+ (ground state) and 5/2+ (first excited state) were assigned to the lowest two states in ...

Spectroscopic manifestations of protonation of the trimethylated pyrichrominium ion studied previously experimentally [1] are investigated using a semiempirical IN DO /S Cl method. Singlet and triplet energy levels of the free ion and several protonated species are calculated, and transition energies and oscillator strengths are compared with experimental spectra. Calculated charge densities on...