An unusually weak intervalence transition in a very stable bis chelate analog of the ruthenium mixed-valent Creutz-Taube ion. UV/visible/near-IR and EPR spectroelectrochemistry of [(NH3)4Ru(.mu.-bptz)Ru(NH3)4]n+ (bptz = 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine; n = 3 - 5)

1993 ◽  
Vol 32 (12) ◽  
pp. 2640-2643 ◽  
Author(s):  
Juergen Poppe ◽  
Michael Moscherosch ◽  
Wolfgang Kaim
Keyword(s):  
Near Ir ◽  
Uv Visible

scholarly journals Autofluorescence spectroscopy and imaging: a tool for biomedical research and diagnosis

2014 ◽  
Author(s):  
A.C. Croce ◽  
G. Bottiroli
Keyword(s):  
Scientific Community ◽  
Data Interpretation ◽  
Near Ir ◽  
Endogenous Fluorophores ◽  
Biological Substrate ◽  
Autofluorescence Spectroscopy ◽  
Uv Visible ◽  
Biological Substrates ◽  
Relationship Of

Native fluorescence, or autofluorescence (AF), consists in the emission of light in the UV-visible, near-IR spectral range when biological substrates are excited with light at suitable wavelength. This is a well-known phenomenon, and the strict relationship of many endogenous fluorophores with morphofunctional properties of the living systems, influencing their AF emission features, offers an extremely powerful resource for directly monitoring the biological substrate condition. Starting from the last century, the technological progresses in microscopy and spectrofluorometry were convoying attention of the scientific community to this phenomenon. In the future, the interest in the autofluorescence will certainly continue. Current instrumentation and analytical procedures will likely be overcome by the unceasing progress in new devices for AF detection and data interpretation, while a progress is expected in the search and characterization of endogenous fluorophores and their roles as intrinsic biomarkers.

scholarly journals Near-Ir Resonance Raman and Uv-Visible Absorption Kinetic Spectroscopy of Optogenetic Archaerhodopsin Neuronal Silencers: Effects of Membrane Potential

2013 ◽  
Vol 104 (2) ◽  
pp. 680a
Author(s):  
John I. Ogren ◽  
Erica C. Saint Clair ◽  
Sergey Mamaev ◽  
Daniel Russano ◽  
Joel M. Kralj ◽  
...  
Keyword(s):  
Membrane Potential ◽  
Resonance Raman ◽  
Visible Absorption ◽  
Kinetic Spectroscopy ◽  
Near Ir ◽  
Absorption Kinetic ◽  
Uv Visible

On the Radiation Stability of BaSO4 Pigment Modified with SiO2 Nanoparticles and Applied for Spacecraft Thermal Control Coatings

2018 ◽  
Vol 386 ◽  
pp. 277-282 ◽  
Author(s):  
Mikhail M. Mikhailov ◽  
Vitaly V. Neshchimenko ◽  
Semyon A. Yuryev ◽  
Anatoly V. Grigorevsky ◽  
Alexey A. Lovitskiy ◽  
...  
Keyword(s):  
Thermal Control ◽  
Radiation Stability ◽  
Maximum Effect ◽  
Nanoparticle Concentration ◽  
Absorption Bands ◽  
Near Ir ◽  
Uv Visible ◽  
Thermal Control Coatings ◽  
Spacecraft Thermal Control ◽  
High Temperature Modification

The authors investigated the effect of a high-temperature modification with SiO2 nanoparticles on the optical properties and radiation stability of BaSO4 powders. The modification leads to insignificant alteration in the reflecting capacity within the UV, visible, and near-IR spectral regions. Appending SiO2 nanoparticles with a concentration of up to 10 wt.% results in the increasing radiation stability of BaSO4 powders. The maximum effect was obtained due to the decreasing intensity of the absorption bands at 270-280, 375-395, 440-460, 500-600, 700, and 950 nm at a nanoparticle concentration of 3 wt.%.

Optical Studies of Polyanilines: Effects of Alkyl Ring-Substitution and Solvent Environment

1989 ◽  
Vol 173 ◽  
Author(s):  
Anjan Ray ◽  
Alan G. MacDiarmid ◽  
John M. Ginder ◽  
Arthur J. Epstein
Keyword(s):  
Acetic Acid Solution ◽  
Exciton Absorption ◽  
Optical Studies ◽  
Band Formation ◽  
Near Ir ◽  
Alkyl Groups ◽  
Solvent Environment ◽  
Polaron Band ◽  
Uv Visible ◽  
Spectroscopy Optical

ABSTRACTMethyl and ethyl ring-substituted polyaniline derivatives have been synthesized and characterized by UV-visible-near IR spectroscopy. Optical spectra of the base forms in DMF solution suggest that the torsion angle between adjacent rings is increased by steric hindrance due to the alkyl groups in the substituted polymers, leading to blue shifts in the ∼4 eV (“bandgap”) and ∼2 eV (“exciton”) absorptions and an accompanying decrease in the relative intensity of the “exciton” band.The methyl ring-substituted derivative, poly(o-toluidine), is shown to exhibit solvatochromism. The “exciton” absorption shifts from 2.03 eV in pure NMP to 2.19 eV in CH2CI2, accompanied by a loss in intensity relative to the “exciton” absorption.The phenomenon is attributed to the presence of a more “rod-like” state in NMP as compared to a more “coil-like” state in CH2CI2.The effects of alkyl substituents on acetic acid solution spectra of “emeraldine” salt will be discussed with respect to polaron band formation in these systems.

Preparation and Wide Tunable Band-Gap Energies of PbTe Nanocrystals Using Glycerin as a Capping Ligand

2014 ◽  
Vol 904 ◽  
pp. 81-85
Author(s):  
Xing Li Ren ◽  
Xing Rong Jiang
Keyword(s):  
Band Gap ◽  
Blue Shift ◽  
Visible Range ◽  
X Ray Diffraction ◽  
Size Dependent ◽  
Near Ir ◽  
Transmission Electron ◽  
Novel Method ◽  
Uv Visible ◽  
Tunable Band Gap

PbTe nanocrystals (NCs) have been synthesized by a novel method at low temperature. Pb acetate being solved in glycerol and Te in TOP solution were used as the precursors for the preparation of PbTe nanocrystals. The as-prepared products were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), UVvis absorption, Fourier transform infrared spectroscopy (FTIR). These data, together with analysis of the absorption spectra, allowed us to observe the size dependence of the peaks in the absorption spectrum. The size-dependent optical spectra of the PbTe nanocrystals exhibits wide tunable band gap energies varying from UV visible range to near IR region, which corresponds to a huge blue shift of 3.0 eV in comparison to the bulk counterpart. Keywords: 1. PbTe nanocrystals, 2. optical properties, 3. wide tunable band gap, 4. microstructure

scholarly journals A Revised Cross-Section Database for Gas Retrieval in the UV-Visible-Near IR Range, Applied to the GOMOS Retrieval Algorithm AerGOM

2019 ◽  
Vol 7 ◽  
Author(s):  
Christine Bingen ◽  
Charles Robert ◽  
Christian Hermans ◽  
Filip Vanhellemont ◽  
Nina Mateshvili ◽  
...  
Keyword(s):  
Cross Section ◽  
Retrieval Algorithm ◽  
Near Ir ◽  
Uv Visible ◽  
Near Ir Range
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