Fermi–Thomas Response of a Metal Surface to an External Point Charge

1969 ◽  
Vol 50 (10) ◽  
pp. 4572-4575 ◽  
Author(s):  
D. M. Newns
Keyword(s):  
Metal Surface ◽  
Point Charge ◽  
External Point

Comment on “Surface-charge distribution on a dielectric sphere due to an external point charge: examples of C60 and C240 fullerenes, Phys. Chem. Chem. Phys., 2013, 15, 20115”

2014 ◽  
Vol 16 (28) ◽  
pp. 14969-14970
Author(s):  
Henning Zettergren ◽  
Fredrik Lindén ◽  
Henrik Cederquist
Keyword(s):  
Dielectric Properties ◽  
Surface Charge ◽  
Charge Distribution ◽  
Point Charge ◽  
Chem Phys ◽  
Dielectric Sphere ◽  
External Point ◽  
Surface Charge Distribution ◽  
Phys Chem Chem Phys

We show that the relative surface charge distribution from classical electrostatics cannot be used to discriminate between different assumptions about the dielectric properties of fullerenes interacting with external charges.

Opsin shifts in bovine rhodopsin and bacteriorhodopsin. Comparison of two external point-charge models

1980 ◽  
Vol 102 (27) ◽  
pp. 7947-7949 ◽  
Author(s):  
Michael G. Motto ◽  
Mordechai Sheves ◽  
Kazuo Tsujimoto ◽  
Valeria Balogh-Nair ◽  
Koji Nakanishi
Keyword(s):  
Point Charge ◽  
Point Charge Models ◽  
Bovine Rhodopsin ◽  
External Point

ChemInform Abstract: OPSIN SHIFTS IN BOVINE RHODOPSIN AND BACTERIORHODOPSIN. COMPARISON OF TWO EXTERNAL POINT-CHARGE MODELS

1981 ◽  
Vol 12 (14) ◽  
Author(s):  
M. G. MOTTO ◽  
M. SHEVES ◽  
K. TSUJIMOTO ◽  
V. BALOGH-NAIR ◽  
K. NAKANISHI
Keyword(s):  
Point Charge ◽  
Point Charge Models ◽  
Bovine Rhodopsin ◽  
External Point

scholarly journals First Principles Determination of Electronic Excitations Induced by Charged Particles

2019 ◽  
Author(s):  
David Lingerfelt ◽  
Panchapakesan Ganesh ◽  
Jacek Jakowski ◽  
Bobby Sumpter
Keyword(s):  
Point Charge ◽  
Scalar Potential ◽  
Charged Particles ◽  
Electronic Excitations ◽  
Consistent Field ◽  
External Point ◽  
Electronic Response ◽  
Self Consistent Field ◽  
General Method

A time dependent self consistent field based method for determining the rates of electronic excitations induced in materials by the presence of external point charges is presented. The method utilizes the full scalar potential of the external point charge in the interaction Hamiltonian instead of relying on multipolar expansions thereof. A general method is presented for determining the conditions under which dipole selection rules are adequate to describe the electronic response of the material to perturbation by external point charges. The position dependence of point charge induced transition rates between the ground and lowest few excited electronic states was resolved for a small polybenzoid. Notably, electronic excitations that are optically forbidden can be strongly allowed for particular positions of the perturbing point charge. Application of the methods detailed here can lead to an improved understanding of the electronic response of materials under irradiation by beams of charged particles.

FERMIONIC STATES IN (2+1) TOPOLOGICAL THEORY

1989 ◽  
Vol 04 (15) ◽  
pp. 1419-1422
Author(s):  
S.YU. KHLEBNIKOV
Keyword(s):  
Point Charge ◽  
Fractional Moment ◽  
Topological Theory ◽  
External Point ◽  
The Moment

The external point charge in (2+1) abelian topological theory creates the field with fractional moment of rotation. We discuss quantization of the moment and spin-statistics connection.

Time-dependent screening of a point charge at a metal surface

2010 ◽  
Vol 22 (30) ◽  
pp. 304013 ◽  
Author(s):  
V M Silkin ◽  
A K Kazansky ◽  
E V Chulkov ◽  
P M Echenique
Keyword(s):  
Metal Surface ◽  
Point Charge ◽  
Time Dependent

Bacteriorhodopsin analogue from anthryl chromophores

1990 ◽  
Vol 68 (3) ◽  
pp. 383-389 ◽  
Author(s):  
Anil K. Singh ◽  
Mita Roy
Keyword(s):  
Absorption Band ◽  
Dark Adaptation ◽  
Point Charge ◽  
Spectrophotometric Analysis ◽  
Reaction Centre ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model ◽  
Nuclear Magnetic Resonance Spectra ◽  
Opsin Shift

Preparation and properties of the bacteriorhodopsin (bR) analogue having the 3,7-dimethyl-9-(9-anthryl)-2E,4E,6E,8E-nonatetraenal (12) chromophore is described. Synthesis of the chromophore has been achieved by successive introduction of C5 units to 9-anthraldehyde (3) via the Horner reaction. The all-trans chromophore has been characterized by its ultraviolet–visible and 1H nuclear magnetic resonance spectra. Incubation of 12 with bacterioopsin suspension (prepared by photobleaching of bR isolated from Halobacteriumhalobium) at ambient temperature in the dark gave the new bR analogue 15, which showed an absorption band at 545 nm, and an opsin shift of 5575 cm−1. The new pigment is stable to hydroxylamine in the dark. It showed light–dark adaptation with the light-adapted form absorbing at a slightly red-shifted value of 550 nm. All-trans-retinal did not replace the anthryl chromophore in competitive bindings. Photolysis of the bR analogue 15, followed by difference spectrophotometric analysis, indicated formation of a photoproduct with an absorption band near 400 nm. The results are discussed in terms of the stereoelectronic requirements of the bR reaction centre. Keywords: bacteriorhodopsin (bR), retinal analogue, reconstitution, opsin shift (OS), external point charge model (EPC).

scholarly journals Understanding Beam Induced Electronic Excitations in Materials

2019 ◽  
Author(s):  
David Lingerfelt ◽  
Panchapakesan Ganesh ◽  
Jacek Jakowski ◽  
Bobby Sumpter
Keyword(s):  
Point Charge ◽  
Scalar Potential ◽  
Transition Rates ◽  
Electronic Excitations ◽  
Consistent Field ◽  
External Point ◽  
Electronic Response ◽  
Self Consistent Field ◽  
Position Dependence ◽  
General Method

A time dependent self consistent field based method for determining the rates of electronic excitations induced in materials by the presence of external point charges is presented. The method utilizes the full scalar potential of the external point charge in the interaction Hamiltonian instead of relying on multipolar expansions thereof. A general method is presented for determining the conditions under which dipole selection rules are adequate to describe the electronic response of the material to perturbation by external point charges. The position dependence of point charge induced transition rates between the ground and lowest few excited electronic states was resolved for a small polybenzoid. Notably, electronic excitations that are optically forbidden can be strongly allowed for particular positions of the perturbing point charge. Application of the methods detailed here can lead to an improved understanding of the electronic response of materials under irradiation by beams of charged particles.

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