scholarly journals Characterization of New Excimer Pumped UV Laser Dyes 3. P-Quinqui-, Sexi-, Octi- and Deciphenyls

1993 ◽  
Vol 13 (1) ◽  
pp. 19-28 ◽  
Author(s):  
C. J. Seliskar ◽  
D. A. Landis ◽  
J. M. Kauffman ◽  
M. A. Aziz ◽  
R. N. Steppel ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Laser Dyes ◽  
Uv Laser ◽  
Predictive Information ◽  
Good Linear ◽  
Phenyl Rings ◽  
Conversion Efficiencies ◽  
Linear Regressions

The spectroscopic and lasing characteristics of a series of 308 nm pumped p-oligophenylenes with five or more phenyl rings have been studied. Quantitative comparisons of the absorption spectra of these dyes with numerous other dyes in this class of compounds can be made by defining a parameter, theta, as the sum of the number of phenyl rings and the number of ring-bridges. Statistically good linear regressions result from the correlations of molar extinction with theta and from wavelength of absorbance with the reciprocal of theta. We find that these correlations provide good predictive information in deciding which dyes to attempt to synthesize for testing. The lasing characteristics of the dyes studied show that these dyes are amongst the best dyes in this class of dyes. Some of these dyes have exceptionally long lifetimes coupled with acceptable conversion efficiencies.

scholarly journals Characterization of New Excimer Pumped UV Laser Dyes 2. p-Quaterphenyls

1991 ◽  
Vol 11 (2) ◽  
pp. 99-107 ◽  
Author(s):  
P. A. Fleitz ◽  
C. J. Seliskar ◽  
R. N. Steppel ◽  
J. M. Kauffman ◽  
C. J. Kelly ◽  
...  
Keyword(s):  
Laser Dyes ◽  
Performance Parameters ◽  
Uv Laser ◽  
Chemical Structures ◽  
Better Than ◽  
Made In

New excimer-pumped laser dyes based on p-quaterphenyl are described and the associated performance parameters are presented. A discussion of the variations in the performance parameters found is made in terms of dye chemical structures. Most of the dyes studied are significantly better than the chosen reference dye BBQ. The best dye in the series (dye 3) is stabilized both by ring-alkylation and by ringbridging. The net effect is the production of a new dye with a lifetime ten times greater than that of the reference dye BBQ.

scholarly journals Characterization of New Excimer Pumped UV Laser Dyes I. p-Terphenyls

1991 ◽  
Vol 11 (1) ◽  
pp. 49-62 ◽  
Author(s):  
D. J. Schneider ◽  
D. A. Landis ◽  
P. A. Fleitz ◽  
C. J. Seliskar ◽  
J. M. Kauffman ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Performance Characteristics ◽  
Laser Dyes ◽  
Uv Laser ◽  
Alternative Solvents

The performance characteristics of a series of new excimer pumped ultraviolet dyes are presented. Chemical structure modifications which influence dye performance are discussed. An evaluation of several alternative solvents shows that p-dioxane remains the solvent of choice based on dye performance. The influence of the cover gas in the dye circulator was examined and results are presented to show how dye performance can greatly depend on this factor.

scholarly journals Structural and computational investigation of an imine-based propeller-shaped macrocyclic cage

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Sriram Srinivasa Raghvan ◽  
Suresh Madhu ◽  
Velmurugan Devadasan ◽  
Gunasekaran Krishnasamy
Keyword(s):  
Band Gap ◽  
Density Functional ◽  
Strain Tensor ◽  
Strong Interactions ◽  
Soft Condensed Matter ◽  
Functional Theory ◽  
Self Assembling ◽  
Phenyl Rings ◽  
Crystal Volume

AbstractIn this study, we present the synthesis, spectroscopic and structural characterization of self-assembling gem-dimethyl imine based molecular cage (IMC). Self-assembling macrocycles and cages have well-defined cavities and have extensive functionalities ranging from energy storage, liquid crystals, and catalysts to water splitting photo absorber. IMC has large voids i.e., 25% of the total crystal volume thus could accommodate wide substrates. The synthesized imine-based molecular cages are stabilized by coaxial π bonded networks and long-range periodic van der Waal and non-bonded contacts as observed from the crystal structure. IMC also has typical properties of soft condensed matter materials, hence theoretical prediction of stress and strain tensor along with thermophysical properties were computed on crystal system and were found to be stable. Molecular dynamics revealed IMC is stabilized by, strong interactions between the interstitial phenyl rings. Density functional theory (DFT) based physicochemical properties were evaluated and has band gap of around 2.38ev (520 nm) similar to various photocatalytic band gap materials.

Experimental and theoretical characterization of the Cn=2,16- clusters produced by 337nm UV laser

2007 ◽  
Vol 445 (4-6) ◽  
pp. 147-151 ◽  
Author(s):  
Francisco Alberto Fernandéz-Lima ◽  
Cássia Ribeiro Ponciano ◽  
Enio Frota da Silveira ◽  
Marco Antonio Chaer Nascimento
Keyword(s):  
Uv Laser ◽  
Theoretical Characterization

Characterization of Nx,Ny-Disubstituted adenines by ultraviolet absorption spectra

1965 ◽  
Vol 2 (3) ◽  
pp. 291-297 ◽  
Author(s):  
Nelson J. Leonard ◽  
Kermit L. Carraway ◽  
John P. Helgeson
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption

Effect of NO2 substitution and solvent on UV-visible spectra, redox potentials and electron transfer mechanisms of copper β-nitrotriarylcorroles. Proposed electrogeneration of a Cu(I) oxidation state

2016 ◽  
Vol 20 (07) ◽  
pp. 753-765 ◽  
Author(s):  
Lina Ye ◽  
Zhongping Ou ◽  
Yuanyuan Fang ◽  
Yang Song ◽  
Bihong Li ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Soret Band ◽  
Redox Potentials ◽  
Nonaqueous Media ◽  
Initial Assignment ◽  
Visible Spectra ◽  
Phenyl Rings ◽  
Uv Visible ◽  
Electron Reduction ◽  
Transfer Mechanisms

Three copper triarylcorroles containing a [Formula: see text]-pyrrole nitro substituent were synthesized and characterized as to their spectral and electrochemical properties in nonaqueous media. The examined compounds are represented as [Formula: see text]-NO2(YPh)3CorCu, where Cor is the trianion of a triphenylcorrole and Y is a Cl, H or CH3 substituent at the para-position of the three meso-phenyl rings of the compound. The data from absorption spectra, electrochemistry and thin-layer spectroelectrochemistry are consistent with an initial assignment of Cu[Formula: see text]-Cor[Formula: see text] in CH2Cl2, DMF and pyridine and electrogeneration of a formal Cu(II) corrole with an unreduced macrocycle, represented as Cu[Formula: see text]-Cor[Formula: see text], after the first one-electron reduction in these solvents. The doubly reduced [Formula: see text]-nitrocorrole has a sharp Soret band at 439 nm and a well-defined Q-band at 611 nm in CH2Cl2. Similar absorption spectra are seen for the three examined doubly reduced nitrocorroles in DMF and pyridine, suggesting formation of a Cu(I) species with an unreduced macrocycle which is represented as Cu[Formula: see text]-Cor[Formula: see text]. Changes in redox potentials and absorption spectra of the nitrocorroles are examined as a function of solvent and substituents on the meso-phenyl rings of the compounds and comparisons are made between spectral and electrochemical data of the newly synthesized corroles and that of structurally related tetraarylcorroles lacking a [Formula: see text]-nitro group.

scholarly journals Order-of-magnitude multiphoton signal enhancement based on characterization of absorption spectra of immersion oils at the 1700-nm window

2017 ◽  
Vol 25 (6) ◽  
pp. 5909 ◽  
Author(s):  
Ke Wang ◽  
Wenhui Wen ◽  
Yuxin Wang ◽  
Kai Wang ◽  
Jiexing He ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Signal Enhancement ◽  
Order Of Magnitude

Evaluation of the Effect of Ultraviolet Light Excitation during Characterization of Silicon Carbide Epitaxial Layers

2018 ◽  
Vol 924 ◽  
pp. 261-264
Author(s):  
Hrishikesh Das ◽  
Swapna Sunkari ◽  
Oener Akdik ◽  
Andrei Konstantinov ◽  
Krister Gumaelius ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Ultraviolet Light ◽  
Defect Detection ◽  
Uv Light ◽  
Surface Treatments ◽  
Uv Laser ◽  
Original State ◽  
Optimal Surface ◽  
Light Excitation

The scanning of Silicon Carbide (SiC) epitaxy wafers for defects by ultraviolet (UV) laser or lamps is widely prevalent. In this work, we document the effects of UV light excitation on the SiC epitaxy material. An increase in background photoluminescence (PL) is observed after repeated scans. The effect of this increase on defect detection is shown. Optimal surface treatments to recover the material back to the original state are demonstrated. Further, some surface treatments are proposed which reduce the effect of the UV light excitation and prevent to a large extent the rise in background PL.

Solvothermal Syntheses and Characterization of Three Lanthanide Thioantimonates(V) with Mixed Ethylene Polyamines

2013 ◽  
Vol 68 (2) ◽  
pp. 133-137 ◽  
Author(s):  
Jian Zhou ◽  
Xing Liu ◽  
Feilong Hu
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Trigonal Prism ◽  
Optical Absorption Spectra ◽  
Neutral Complex ◽  
Solvothermal Syntheses ◽  
Absorption Edges

Three new lanthanide thioantimonates(V) [Ln(en)(teta)(SbS4)] {Ln=Sm (1), Eu (2), Gd (3); en=ethylenediamine; teta=triethylenetetramine} have been solvothermally synthesized and structurally characterized. Compounds 1 - 3 are isostructural. The [SbS4]3- anion acting as bichelating ligand is bound to the [Ln(en)(teta)]3+ ion, resulting in a neutral complex [Ln(en)(teta)(SbS4)]. The central Ln3+ ion lies within an eight-coordinate environment forming a distorted bicapped trigonal prism LnN6S2. Although a few lanthanide thioantimonates have been reported to date, they only contain one type of ethylene polyamine. Compounds 1 - 3 are rare examples of lanthanide thioantimonates with mixed ethylene polyamine ligands. The absorption edges of 1:75 eV for 1 and 2:27 eV for 3 have been derived from optical absorption spectra.

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