Effect of wave-function delocalization on the exciton splitting in organic conjugated materials

2000 ◽  
Vol 62 (10) ◽  
pp. 6296-6300 ◽  
Author(s):  
M. Muccini ◽  
M. Schneider ◽  
C. Taliani ◽  
M. Sokolowski ◽  
E. Umbach ◽  
...  
Keyword(s):  
Wave Function ◽  
Conjugated Materials ◽  
Exciton Splitting ◽  
Organic Conjugated Materials

Recent advances in dithiafulvenyl-functionalized organic conjugated materials

2020 ◽  
Vol 44 (12) ◽  
pp. 4681-4693 ◽  
Author(s):  
Maryam F. Abdollahi ◽  
Yuming Zhao
Keyword(s):  
Active Component ◽  
Conjugated Materials ◽  
Recent Advances ◽  
Redox Active ◽  
Organic Conjugated Materials

This review highlights the recent studies of advanced organic π-conjugated materials that contain 1,4-dithiafulvene (DTF) as a redox-active component.

Annulation Reactions for Conjugated Ladder-Type Oligomers

Synlett ◽  
2018 ◽  
Vol 29 (08) ◽  
pp. 993-998 ◽  
Author(s):  
Lei Fang ◽  
Alexander Kalin ◽  
Jongbok Lee
Keyword(s):  
Organic Materials ◽  
Conjugated Materials ◽  
Organic Conjugated Materials

Conjugated ladder-type oligomers are a class of important functional organic materials. They possess intriguing properties stemming from their fully fused aromatic backbones. The construction of the ladder-type backbone relies on a ‘ladderization’ step, which may be accomplished through either kinetically or thermodynamically controlled annulation reactions. The attributes of these reactions are discussed, with relevant recent examples. The development of these reactions is key to continued advances and innovation in the field of organic conjugated materials.1 Introduction2 Kinetic Annulations3 Thermodynamic Annulations4 Future Outlooks and Conclusion

Nonadiabatic Excited-State Molecular Dynamics: Modeling Photophysics in Organic Conjugated Materials

2014 ◽  
Vol 47 (4) ◽  
pp. 1155-1164 ◽  
Author(s):  
Tammie Nelson ◽  
Sebastian Fernandez-Alberti ◽  
Adrian E. Roitberg ◽  
Sergei Tretiak
Keyword(s):  
Molecular Dynamics ◽  
Excited State ◽  
Dynamics Modeling ◽  
Conjugated Materials ◽  
Molecular Dynamics Modeling ◽  
Organic Conjugated Materials

Ambipolar Transport in Organic Conjugated Materials

2007 ◽  
Vol 19 (14) ◽  
pp. 1791-1799 ◽  
Author(s):  
J. Cornil ◽  
J.-L. Brédas ◽  
J. Zaumseil ◽  
H. Sirringhaus
Keyword(s):  
Conjugated Materials ◽  
Organic Conjugated Materials ◽  
Ambipolar Transport

Analytic integration of contrast transfer functions

1988 ◽  
Vol 46 ◽  
pp. 822-823
Author(s):  
Peter Rez
Keyword(s):  
Wave Function ◽  
Transfer Function ◽  
Transfer Functions ◽  
Spherical Aberration ◽  
Continuous Distribution ◽  
Objective Lens ◽  
Direction Parallel ◽  
Scattering Angle ◽  
Analytic Integration ◽  
Image Position

In high resolution microscopy the image amplitude is given by the convolution of the specimen exit surface wave function and the microscope objective lens transfer function. This is usually done by multiplying the wave function and the transfer function in reciprocal space and integrating over the effective aperture. For very thin specimens the scattering can be represented by a weak phase object and the amplitude observed in the image plane is1where fe (Θ) is the electron scattering factor, r is a postition variable, Θ a scattering angle and x(Θ) the lens transfer function. x(Θ) is given by2where Cs is the objective lens spherical aberration coefficient, the wavelength, and f the defocus.We shall consider one dimensional scattering that might arise from a cross sectional specimen containing disordered planes of a heavy element stacked in a regular sequence among planes of lighter elements. In a direction parallel to the disordered planes there will be a continuous distribution of scattering angle.

Atomic Imaging of Crystals using Large-Angle Electron Scattering in STEM

1990 ◽  
Vol 48 (1) ◽  
pp. 74-75
Author(s):  
D.E. Jesson ◽  
S. J. Pennycook
Keyword(s):  
Wave Function ◽  
Electron Scattering ◽  
Numerical Solutions ◽  
Large Angle ◽  
Real Space ◽  
High Angle ◽  
Analytical Treatment ◽  
Order Zero ◽  
Experimental Conditions ◽  
Ewald Sphere

It is well known that conventional atomic resolution electron microscopy is a coherent imaging process best interpreted in reciprocal space using contrast transfer function theory. This is because the equivalent real space interpretation involving a convolution between the exit face wave function and the instrumental response is difficult to visualize. Furthermore, the crystal wave function is not simply related to the projected crystal potential, except under a very restrictive set of experimental conditions, making image simulation an essential part of image interpretation. In this paper we present a different conceptual approach to the atomic imaging of crystals based on incoherent imaging theory. Using a real-space analysis of electron scattering to a high-angle annular detector, it is shown how the STEM imaging process can be partitioned into components parallel and perpendicular to the relevant low index zone-axis.It has become customary to describe STEM imaging using the analytical treatment developed by Cowley. However, the convenient assumption of a phase object (which neglects the curvature of the Ewald sphere) fails rapidly for large scattering angles, even in very thin crystals. Thus, to avoid unpredictive numerical solutions, it would seem more appropriate to apply pseudo-kinematic theory to the treatment of the weak high angle signal. Diffraction to medium order zero-layer reflections is most important compared with thermal diffuse scattering in very thin crystals (<5nm). The electron wave function ψ(R,z) at a depth z and transverse coordinate R due to a phase aberrated surface probe function P(R-RO) located at RO is then well described by the channeling approximation;

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