Vibration Energy Accumulation and Redistribution in Organic Molecules Irradiated by Infrared Photons

2007 ◽  
Vol 62 (5-6) ◽  
pp. 324-330 ◽  
Author(s):  
Hartmut Jungclas ◽  
Anna M. Popova ◽  
Viacheslav V. Komarov ◽  
Lothar Schmidt ◽  
Alexander Zulauf
Keyword(s):  
Organic Molecules ◽  
Electronic Excitation ◽  
Vibrational Energy ◽  
Point Of View ◽  
Low Energy ◽  
Photon Absorption ◽  
Energy Accumulation ◽  
Dipole Interactions ◽  
Donor And Acceptor ◽  
Vibrational Excitations

A theoretical approach to the dissociation and low-energy electronic excitation of polyatomic organic molecules with donor and acceptor substructures is suggested. The donor hydrocarbon molecular substructures can serve as antennas for low-energy infrared (IR)-photon absorption, which coherently induce collective vibrational excitations (excimols). Due to dipole-dipole interactions, the accumulated energy can transit to the molecular acceptors: dipole-type trap-bonds or molecular parts with π-electron orbits. The analytical expressions for the probability functions of molecular fragmentation and electronic excitation induced by IR-multiphoton absorption are derived. The vibrational energy accumulation and redistribution in the molecules of diphenylalkanes irradiated by infrared photons are considered from the presented point of view.

Local Heating and Dissociation of Organic Molecules by IR Fields

2004 ◽  
Vol 59 (12) ◽  
pp. 964-970 ◽  
Author(s):  
H. Jungclas ◽  
L. Schmidt ◽  
V.V. Komarov ◽  
A.M. Popova ◽  
I. O. Stureiko
Keyword(s):  
Organic Molecules ◽  
Vibrational Energy ◽  
Local Heating ◽  
Dissociation Probability ◽  
Dipole Interactions ◽  
Internal Transition ◽  
Pile Up ◽  
Vibrational Excitations ◽  
Position And Orientation ◽  
A Chain

A nonstatistical model for internal transition of collective vibrational energy to specific bonds in organic molecules is presented. The model is developed for molecules which contain a chain of identical biatomic dipoles, e.g. C-H groups. Resonant IR fields can induce collective vibrational excitations (excimols) in the dipole chain. The accumulated vibrational energy can be transmitted to particular bonds, which are not part of the chain but close enough for dipole-dipole interactions. Specific properties of such bonds enable a pile up of harvested excimol energy there, thus making dissociation of these bonds a likely exit channel. An analytical expression for the calculation of dissociation probabilities was derived and analysed. It is shown that the dissociation probability strongly depends on the position and orientation of the bond relative to the position and orientation of the dipoles in the chain. The consequences of the presented model were experimentally checked by comparing the fragmentation of the isomers Leucine and Isoleucine. - PACS: 30.00 - 34.10 - 36.40

scholarly journals Effects of Accumulated Energy on Nanoparticle Formation in Pulsed-Laser Dewetting of AgCu Thin Films

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
H. K. Lin ◽  
C. W. Huang ◽  
Y. H. Lin ◽  
W. S. Chuang ◽  
J. C. Huang
Keyword(s):  
Pulsed Laser ◽  
Blue Shift ◽  
High Energy ◽  
Low Energy ◽  
Nanoparticle Formation ◽  
Energy Accumulation ◽  
Glass Substrates ◽  
Peak Absorption ◽  
Two Peaks ◽  
Sputtering System

AbstractAg50Cu50 films were deposited on glass substrates by a sputtering system. Effects of accumulated energy on nanoparticle formation in pulse-laser dewetting of AgCu films were investigated. The results showed that the properties of the dewetted films were found to be dependent on the magnitude of the energy accumulated in the film. For a low energy accumulation, the two distinct nanoparticles had rice-shaped/Ag60Cu40 and hemispherical/Ag80Cu20. Moreover, the absorption spectra contained two peaks at 700 nm and 500 nm, respectively. By contrast, for a high energy accumulation, the nanoparticles had a consistent composition of Ag60Cu40, a mean diameter of 100 nm and a peak absorption wavelength of 550 nm. Overall, the results suggest that a higher Ag content of the induced nanoparticles causes a blue shift of the absorption spectrum, while a smaller particle size induces a red shift.

Monte Carlo Simulation of Electronic Excitation Migrationand Trappingin Disordered Two-Component Systems. A Comparison with Analytical Theories

1989 ◽  
Vol 44 (4) ◽  
pp. 257-261 ◽  
Author(s):  
Sławomir Błonski ◽  
Czesław Bojarski
Keyword(s):  
Monte Carlo ◽  
Electronic Excitation ◽  
Two Component System ◽  
Component System ◽  
Steady State Fluorescence ◽  
Donor And Acceptor ◽  
Component Systems ◽  
Two Component ◽  
Two Component Systems ◽  
Viscous Solution

Abstract Monte Carlo simulations of quantum yield and anisotropy of fluorescence in two-component systems have been conducted with various donor and acceptor concentrations and Förster radii ratios RDAO/RDDO. The influence of excitation migration and trapping on the fluorescence of the viscous solution has been considered. The results of the simulations have shown that steady-state fluorescence of a two-component system depends on the RDAO/RDDO ratio as predicted in LAF theory.

On Broken Symmetry

2019 ◽  
Vol 4 (3) ◽  
Author(s):  
Vladimir Zelevinsky
Keyword(s):  
Point Of View ◽  
Low Energy ◽  
Broken Symmetry ◽  
Symmetry Problem ◽  
Energy Physics

From the practical position of a quantum theoretician working in low-energy physics, here is a more modest point of view on the symmetry problem, including its various manifestations and violations.

Low-energy Ion Beam Biotechnology at Chiang Mai University

2009 ◽  
Vol 1181 ◽  
Author(s):  
Liangdeng Yu ◽  
S. Anuntalabhochai
Keyword(s):  
Gene Transfer ◽  
Biological Effects ◽  
Ion Beam ◽  
Point Of View ◽  
Low Energy ◽  
Theoretical Point ◽  
Chiang Mai ◽  
Naked Dna ◽  
Recent Developments ◽  
Cell Envelopes

AbstractMeV-ion beam has long been applied to biology research and applications for many decades as highly energetic ions are undoubtedly able to interact directly with biology molecules to cause changes in biology. However, low-energy ion beam at tens of keV and even lower has also been found to have significant biological effects on living materials. The finding has led to applications of ion-beam induced mutation and gene transfer. From the theoretical point of view, the low-energy ion beam effects on biology are difficult to understand since the ion range is so short that the ions can hardly directly interact with the key biological molecules for the changes. This talk introduces interesting aspects of low-energy ion beam biology, including basis of ion beam biotechnology and recent developments achieved in Chiang Mai University in relevant applications such as mutation and gene transfer and investigations on mechanisms involved in the low-energy ion interaction with biological matter such as eV-keV ion beam bombardments of naked DNA and the cell envelopes.

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