摘要:

AbstractThe decay of the M intermediate and the recovery kinetics of bacteriorhodopsin (bR) were detected optically in dry and wet bR Langmuir–Blodgett (LB) films and electrically in dry films. From the electrical signals the kinetics of the proton motion was distinguished from the cell function and it was found to be equal to that determined optically for the M intermediate decay. The rate‐determining step for the recovery rate of bR was found to be the M st

ISSN:1057-9257    

DOI:10.1002/amo.860020502

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractA novel non‐linear fluorescence (NLF) effect in polar dimethylaminobenzylidene 1,3‐indandione (DMABI) crystals is presented and discussed. A single crystal or vacuum‐evaporated layer of DMABI excited in the IR region at 1064 nm (by a Q‐switched YAG laser) emits red light in the visible region of the spectrum at 600–740 nm depending on the DMABI crystalline modification. This anti‐Stokes luminescence shows aquadraticdependence on the exciting light intensity which transforms to a linear dependence at very high excitation intensities. The observed NLF effect under IR excitation is determined by optical transitions intointermolecularcharge transfer (CT) states. It has been suggested that the photoexcited singlet1CT excitations may either interact in aquadraticsinglet–singlet (1CT +1CT) annihilation reaction or, more probably, form long‐lived triplet3CT excitons via a hyperfine interaction effect which may subsequently annihilate in a similar bimolecular fusion reaction (3CT +3CT). In both cases the excited molecular singlet state S1is formed and thus the NLF effect is due to singlet–singlet or triplet–triplet fusion of CT excitons. A detailed energy diagram and kinetic description of the model are presented. Quantum chemical calculations of the electronic structure of the DMABI molecule illustrate thedipolarnature of its ground

ISSN:1057-9257    

DOI:10.1002/amo.860020503

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractSolvent‐cast polyaniline films have been deposited by spin coating and photolithographic techniques used to pattern the films to a resolution of 15–20 μm. This approach is then used successfully to deposit the polymer on the gate areas of an array of silicon field effect transis

ISSN:1057-9257    

DOI:10.1002/amo.860020504

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractPolyalkylthiophene thin films have been prepared to enable the characterisation of the films with transmission spectroscopy and profilometry for the first time. The optical properties of the films as a function of annealing temperature are discussed. The changes in absorption with time are related to thermochromism.

ISSN:1057-9257    

DOI:10.1002/amo.860020505

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

摘要:

AbstractThe experiments described in this paper were undertaken in order to obtain information about the relationship between the structure and non‐linear optical properties (second‐harmonic generation) of organic thin films. For this purpose, two closely related dyes, diones and tetrones, were compared, both of which are shown to have large hyperpolarisabilities. Their microscopic properties are investigated by conformational analysis and electron diffraction. It could be shown that detailed knowledge about the structure and the adjacent neighbour packing can be obtained from conformational analysis and electron diffraction in order to understand the non‐linear optical properties of the two

ISSN:1057-9257    

DOI:10.1002/amo.860020506

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

ISSN:1057-9257    

DOI:10.1002/amo.860020507

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY

ISSN:1057-9257    

DOI:10.1002/amo.860020501

出版商:John Wiley&Sons Ltd.    

年代:1993

数据来源: WILEY