Vibrational energy migration along hydrocarbon chains: a model study

1990 ◽  
Vol 94 (18) ◽  
pp. 6959-6962 ◽  
Author(s):  
Alessandro. Lami ◽  
Giovanni. Villani
Keyword(s):  
Vibrational Energy ◽  
Energy Migration ◽  
Model Study ◽  
Hydrocarbon Chains

Coulomb Dissociation of Nanoparticles Grazing along Organic Surfaces

2012 ◽  
Vol 67 (5) ◽  
pp. 296-302
Author(s):  
Viacheslav V. Komarov ◽  
Anna M. Popova ◽  
Lothar Schmidt ◽  
Hartmut Jungclas
Keyword(s):  
Small Molecules ◽  
Minimum Distance ◽  
Vibrational Energy ◽  
Coulomb Repulsion ◽  
Photon Flux ◽  
Coulomb Dissociation ◽  
Surface Molecules ◽  
Hydrocarbon Chains ◽  
Dissociation Model ◽  
Molecular Nanoparticles

A Coulomb dissociation model is presented for molecular nanoparticles, e.g. nanoclusters consisting of identical atoms or small molecules. These nanoparticles graze with velocities less than the Bohr velocity (108 cm=s) along an organic surface at atomic distances. The surface molecules contain IR-antennas, which consist of periodically located identical diatomic valence bonds with significant dipole momenta, e.g. hydrocarbon chains like (CH2)n. Here, we analyse the Coulomb interaction of these surface molecules with grazing nanoparticles, which do not contain any IR-antennas, e.g. fullerene molecules. Provided that the grazing velocity is in the range of 105 - 107 cm=s and the minimum distance of the grazing nanoparticles to the surface is approximately 2 Å , the IR-antennas of the interacting surface molecules will collect vibrational energy quanta, the so-called excimols. The number of excimols accumulated during the interaction time of at least 1 ps increases with the number of dipoles in the IR-antennas. Excimol energy can be transmitted back to the grazing nanoparticle by a ps-photon flux, which is estimated intense enough to induce multi-ionization of nanoparticle constituents. The resulting charges inside the nanoparticles cause high Coulomb repulsion forces, which will be able to promptly dissociate them.

scholarly journals Spectral Hole Burning and Evidence for Vibrational Energy Migration of H-Bonded Molecules Observed With Transient Infrared Spectroscopy

1999 ◽  
Vol 19 (1-4) ◽  
pp. 389-392 ◽  
Author(s):  
R. Laenen ◽  
C. Rauscher
Keyword(s):  
Infrared Spectroscopy ◽  
Vibrational Energy ◽  
Energy Migration ◽  
Hole Burning ◽  
Spectral Hole Burning ◽  
Spectral Hole ◽  
Stretching Vibration ◽  
Dynamical Features

Via intense ps-excitation of the OH-stretching vibration of ethanol diluted in CCl4 we succeed in spectral hole burning within the inhomogeneously broadened oligomer band. The lifetime of the transient hole and the v=1-level of the OH-stetch of associated ethanol molecules are determined to be about 1.2 and 1.7 ps, respectively. Further dynamical features are discussed which give evidence for energy migration within the H-bonded ethanol chains and subsequent breaking of the oligomers into shorter fragments.

Role of vibrational energy migration upon V → V transfer in matrix isolated Co

1979 ◽  
Vol 41 (3) ◽  
pp. 329-343 ◽  
Author(s):  
Henri Dubost ◽  
Renée Charneau
Keyword(s):  
Vibrational Energy ◽  
Energy Migration

Nonlinear resonances and vibrational energy flow in model hydrocarbon chains

1983 ◽  
Vol 79 (9) ◽  
pp. 4247-4260 ◽  
Author(s):  
John S. Hutchinson ◽  
William P. Reinhardt ◽  
James T. Hynes
Keyword(s):  
Energy Flow ◽  
Vibrational Energy ◽  
Nonlinear Resonances ◽  
Hydrocarbon Chains ◽  
Vibrational Energy Flow

Direct visualization of phase-separated domains in lipid membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 290-291
Author(s):  
S. W. Hui ◽  
T. P. Stewart
Keyword(s):  
Lipid Membranes ◽  
Structural Information ◽  
Freeze Fracture ◽  
Biological Molecules ◽  
Vacuum Drying ◽  
Direct Visualization ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Hydrocarbon Chains

Direct electron microscopic study of biological molecules has been hampered by such factors as radiation damage, lack of contrast and vacuum drying. In certain cases, however, the difficulties may be overcome by using redundent structural information from repeating units and by various specimen preservation methods. With bilayers of phospholipids in which both the solid and fluid phases co-exist, the ordering of the hydrocarbon chains may be utilized to form diffraction contrast images. Domains of different molecular packings may be recgnizable by placing properly chosen filters in the diffraction plane. These domains would correspond to those observed by freeze fracture, if certain distinctive undulating patterns are associated with certain molecular packing, as suggested by X-ray diffraction studies. By using an environmental stage, we were able to directly observe these domains in bilayers of mixed phospholipids at various temperatures at which their phases change from misible to inmissible states.

Social Desirability in Personality Inventories

2014 ◽  
Vol 35 (3) ◽  
pp. 144-157 ◽  
Author(s):  
Martin Bäckström ◽  
Fredrik Björklund
Keyword(s):  
Social Desirability ◽  
Big Five ◽  
Work Performance ◽  
Factor Model ◽  
Five Factor Model ◽  
Peer Ratings ◽  
Personality Inventories ◽  
Model Study ◽  
The Difference ◽  
New Variables

The difference between evaluatively loaded and evaluatively neutralized five-factor inventory items was used to create new variables, one for each factor in the five-factor model. Study 1 showed that these variables can be represented in terms of a general evaluative factor which is related to social desirability measures and indicated that the factor may equally well be represented as separate from the Big Five as superordinate to them. Study 2 revealed an evaluative factor in self-ratings and peer ratings of the Big Five, but the evaluative factor in self-reports did not correlate with such a factor in ratings by peers. In Study 3 the evaluative factor contributed above the Big Five in predicting work performance, indicating a substance component. The results are discussed in relation to measurement issues and self-serving biases.

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