Fundamental Electron-Molecule Interactions and Their Technological Significance

2004 ◽  
pp. 1-59
Author(s):  
Loucas G. Christophorou ◽  
James K. Olthoff
Keyword(s):  
Molecule Interactions ◽  
Technological Significance

Luminescence from individual dislocations in II-VI and III-V semiconductors

1991 ◽  
Vol 49 ◽  
pp. 834-835
Author(s):  
J W Steeds
Keyword(s):  
Group Iv ◽  
Luminescence Properties ◽  
Carrier Recombination ◽  
Transmission Electron ◽  
Wide Range ◽  
Basic Physics ◽  
Semiconducting Compounds ◽  
Diamond Group ◽  
Non Destructive ◽  
Technological Significance

There is a wide range of experimental results related to dislocations in diamond, group IV, II-VI, III-V semiconducting compounds, but few of these come from isolated, well-characterized individual dislocations. We are here concerned with only those results obtained in a transmission electron microscope so that the dislocations responsible were individually imaged. The luminescence properties of the dislocations were studied by cathodoluminescence performed at low temperatures (~30K) achieved by liquid helium cooling. Both spectra and monochromatic cathodoluminescence images have been obtained, in some cases as a function of temperature.There are two aspects of this work. One is mainly of technological significance. By understanding the luminescence properties of dislocations in epitaxial structures, future non-destructive evaluation will be enhanced. The second aim is to arrive at a good detailed understanding of the basic physics associated with carrier recombination near dislocations as revealed by local luminescence properties.

Small Molecule Interactions with Protein−Tyrosine Phosphatase PTP1B and Their Use in Inhibitor Design†

Biochemistry ◽  
1996 ◽  
Vol 35 (50) ◽  
pp. 15989-15996 ◽  
Author(s):  
Terrence R. Burke, ◽  
Bin Ye ◽  
Xinjian Yan ◽  
Shaomeng Wang ◽  
Zongchao Jia ◽  
...  
Keyword(s):  
Small Molecule ◽  
Protein Tyrosine Phosphatase ◽  
Tyrosine Phosphatase ◽  
Inhibitor Design ◽  
Protein Tyrosine ◽  
Molecule Interactions

Amorphous Co(OH)2 nanocages achieving efficient photo-induced charge transfer for significant SERS activity

2022 ◽  
Author(s):  
Jian Yu ◽  
CHEN CHAO ◽  
Jie Lin ◽  
Xiangyu Meng ◽  
Lin Qiu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Raman Scattering ◽  
Vibronic Coupling ◽  
Substrate Molecule ◽  
Surface Enhanced ◽  
Critical Issues ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Induced Charge ◽  
Molecule Interactions

Boosting substrate-molecule interactions, especially the strong vibronic coupling and efficient photo-induced charge transfer (PICT) transitions, are critical issues to improve surface-enhanced Raman scattering (SERS) sensitivity of non-metal substrates. Here, by...

scholarly journals Frequency dispersion reveals chromophore diversity and colour-tuning mechanism in parrot feathers

2018 ◽  
Vol 5 (7) ◽  
pp. 172010 ◽  
Author(s):  
Jonathan E. Barnsley ◽  
Elliot J. Tay ◽  
Keith C. Gordon ◽  
Daniel B. Thomas
Keyword(s):  
Frequency Dispersion ◽  
Animal Coloration ◽  
Molecular Conformations ◽  
Tuning Mechanism ◽  
Resonance Raman Spectra ◽  
Molecule Interactions ◽  
Yellow Region ◽  
Colour Tuning

Variation in animal coloration is often viewed as the result of chemically distinct pigments conferring different hues. The role of molecular environment on hue tends to be overlooked as analyses are mostly performed on free pigments extracted from the integument. Here we analysed psittacofulvin pigments within parrot feathers to explore whether the in situ organization of pigments may have an effect on hue. Resonance Raman spectra from a red region of a yellow-naped amazon Amazona auropalliata tail feather show frequency dispersion, a phenomenon that is related to the presence of a range of molecular conformations (and multiple chromophores) in the pigment, whereas spectra from a yellow region on the same feather do not show the same evidence for multiple chromophores. Our findings are consistent with non-isomeric psittacofulvin pigments behaving as a single chromophore in yellow feather barbs, which implies that psittacofulvins are dispersed into a structurally disordered mixture in yellow feathers compared with red feathers. Frequency dispersion in red barbs may instead indicate that pigments are structurally organized through molecule–molecule interactions. Major differences in the hues of parrot feathers are thus associated with differences in the organization of pigments within feathers.

Sign in / Sign up

Export Citation Format

Share Document