Structure Dependence of Hyperpolarizability in Octopolar Molecules

Structure Dependence of Hyperpolarizability in Octopolar Molecules.

Recent Hyper Rayleigh Scattering measurements report a significant increase of second-order hyperpolarizability upon introduction of positive charges at the pyridyl end groups in trispyridyl octopolar chromophores. We calculated the geometries, linear response, and first-order hyperpolarizabilities of a series of six trispyridyl molecules both in the neutral and protonated forms. The calculatio...

Measurements of Kleinman-Disallowed Hyperpolarizability in Conjugated Chiral Molecules

the role of thematic structure in comprehending spoken language

in fact this study is concerned with the relationship between the variation in thematice structure and the comprehension of spoken language. so the study focused on the following questions: 1. is there any relationship between thematic structure and the comprehension of spoken language? 2. which of the themes would have greated thematic force and be easier for the subjects to comprehend? accord...

Frequency Dependence of the Hyperpolarizability Measured for Sf,

The second hyperpolarizability 7 of a molecule plays a role in non-linear optical processes [ 1,2] as well as in intermolecular interactions [3,4]. Usually y(--wo; WI, ~2, ~3) is measured by optical methods such as the dc Kerr effect, electric-field-induced second-harmonic generation (ESHG) of third-harmonic generation (THG), where these processes differ in the choice of the frequency arguments...

the effects of changing roughness on the flow structure in the bends

flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...