A Diagram of Some of the Energy Levels of Gadolinium IV in the Crystal Lattice as Obtained from the Ultraviolet Absorption Spectra of GdCl3·6H2O and GdBr3·6H2O

1931 ◽  
Vol 38 (4) ◽  
pp. 670-678 ◽  
Author(s):  
Simon Freed ◽  
Frank H. Spedding
Keyword(s):  
Crystal Lattice ◽  
Absorption Spectra ◽  
Energy Levels ◽  
Ultraviolet Absorption

THE ULTRAVIOLET ABSORPTION SPECTRA OF METHYL-1,2-BENZANTHRACENES

1956 ◽  
Vol 34 (7) ◽  
pp. 888-905 ◽  
Author(s):  
C. Sandorfy ◽  
R. Norman Jones
Keyword(s):  
Fine Structure ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Electronic Excitation ◽  
Energy Levels ◽  
Ultraviolet Absorption ◽  
Methyl Derivatives ◽  
Overlapping Bands

The ultraviolet absorption spectra of 1,2-benzanthracene, all twelve mono-methyl derivatives, and six dimethyl derivatives have been measured (a) at room temperature in n-heptane solution, (b) at −100 °C. in n-pentane solution. An analysis of the band envelopes indicates that most of the absorption between 33,000 and 25,000 cm.−1 arises from two series of overlapping bands. The members of each series are spaced at intervals of approximately 1400 cm.−1. The spacing between the two band series and their relative intensities are dependent on the nature and position of the alkyl substituents. Absorption between 40,000 and 33,000 cm.−1 can be treated in a similar manner. Other fine structure is also observed. It is considered most probable that each of the overlapping series of bands is associated with a separate electronic excitation. The significance of these observations is considered in relation to the theoretical treatments of the energy levels of 1,2-benzanthracene as developed by Klevens and Platt and by Moffitt.

The structure and ultraviolet absorption spectra of isothiocyanates of 4-substituted diphenyl sulphides, sulphoxides and sulphones

1969 ◽  
Vol 34 (12) ◽  
pp. 4005-4010 ◽  
Author(s):  
M. Uher ◽  
P. Kristian ◽  
T. Sticzay ◽  
K. Antoš
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption

FAR ULTRAVIOLET ABSORPTION SPECTRA OF N3AND N2+GENERATED BY ELECTRONS IMPACTING GASEOUS N2

2013 ◽  
Vol 779 (1) ◽  
pp. 40 ◽  
Author(s):  
Yu-Jong Wu ◽  
Hui-Fen Chen ◽  
Shiang-Jiun Chuang ◽  
Tzu-Ping Huang
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Far Ultraviolet

scholarly journals Unraveling the electrochemical and spectroscopic properties of neutral and negatively charged perylene tetraethylesters

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Christian Wiebeler ◽  
Joachim Vollbrecht ◽  
Adam Neuba ◽  
Heinz-Siegfried Kitzerow ◽  
Stefan Schumacher
Keyword(s):  
Absorption Spectra ◽  
Density Functional ◽  
Energy Levels ◽  
Spectroscopic Properties ◽  
Absorption Bands ◽  
Functional Theory ◽  
Vertical Excitation ◽  
Hartree Fock ◽  
Tauc Plot ◽  
Electrochemical Approach

AbstractA detailed investigation of the energy levels of perylene-3,4,9,10-tetracarboxylic tetraethylester as a representative compound for the whole family of perylene esters was performed. It was revealed via electrochemical measurements that one oxidation and two reductions take place. The bandgaps determined via the electrochemical approach are in good agreement with the optical bandgap obtained from the absorption spectra via a Tauc plot. In addition, absorption spectra in dependence of the electrochemical potential were the basis for extensive quantum-chemical calculations of the neutral, monoanionic, and dianionic molecules. For this purpose, calculations based on density functional theory were compared with post-Hartree–Fock methods and the CAM-B3LYP functional proved to be the most reliable choice for the calculation of absorption spectra. Furthermore, spectral features found experimentally could be reproduced with vibronic calculations and allowed to understand their origins. In particular, the two lowest energy absorption bands of the anion are not caused by absorption of two distinct electronic states, which might have been expected from vertical excitation calculations, but both states exhibit a strong vibronic progression resulting in contributions to both bands.

scholarly journals ULTRAVIOLET ABSORPTION SPECTRA AT REDUCED TEMPERATURES

1950 ◽  
Vol 187 (1) ◽  
pp. 299-312
Author(s):  
R.L. Sinsheimer ◽  
J.F. Scott ◽  
J.R. Loofbourow
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption

Anthochlor Pigments. XIII. The Ultraviolet Absorption Spectra of Phenolic Plant Pigments. Polyhydroxyaurones

1956 ◽  
Vol 78 (4) ◽  
pp. 832-837 ◽  
Author(s):  
T. A. Geissman ◽  
J. B. Harborne
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Plant Pigments

Ultraviolet Absorption Spectra of Nitroparaffins, Alkyl Nitrates, and Alkyl Nitrites

1956 ◽  
Vol 21 (9) ◽  
pp. 993-996 ◽  
Author(s):  
HERBERT E. UNGNADE ◽  
ROBERT A. SMILEY
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Alkyl Nitrates ◽  
Alkyl Nitrites

The ultraviolet absorption spectra of benzoyl polyglycine anilides and benzoyl polyalanine anilides

1959 ◽  
Vol 81 (2) ◽  
pp. 493-499 ◽  
Author(s):  
A.R. Goldfarb ◽  
E. Hoffman
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption

ULTRAVIOLET ABSORPTION SPECTRA AND ACIDITIES OF ISOMERIC THIATRIAZOLE AND TETRAZOLE DERIVATIVES

1959 ◽  
Vol 37 (3) ◽  
pp. 563-574 ◽  
Author(s):  
Eugene Lieber ◽  
J. Ramachandran ◽  
C. N. R. Rao ◽  
C. N. Pillai
Keyword(s):  
Absorption Spectra ◽  
Absorption Maximum ◽  
Dipole Moments ◽  
Ring System ◽  
Ultraviolet Absorption ◽  
Characteristic Absorption ◽  
Tetrazole Derivatives

The ultraviolet absorption spectra of 5-(substituted)amino-1,2,3,4-thiatriazoles and the corresponding isomeric 1-substituted-tetrazoline-5-thiones have been studied. The spectra and the dipole moments of the 5-(substituted)amino-1,2,3,4-thiatriazoles eliminate the possibility of meso-ionic structures for these compounds. The dipole moments of 5-amino-, 5-methylamino-, and 5-dimethylamino-1,2,3,4-thiatriazole were all high but approximately of the same value (5.77 to 5.84 D). This suggests that the amino thiatriazoles are best represented by conventional covalent structures with significant ionic resonance contributions. The thiatriazole ring system exhibits a characteristic absorption maximum at 250–255 mμ and an electron-withdrawing effect approximately equal to the tetrazolyl ring system. The tetrazolinethionolyl ring system is similarly electron-withdrawing. The relative acidities of the 1-substituted-tetrazoline-5-thiones and the 5-alkylmercaptotetrazoles have also been studied and the results support the observations made on the basis of their ultraviolet absorption spectra.

Ultraviolet absorption spectra of monomer and dimer of benzoic acid

1962 ◽  
Vol 8 (1-6) ◽  
pp. 257-275 ◽  
Author(s):  
Haruo Hosoya ◽  
Jiro Tanaka ◽  
Saburo Nagakura
Keyword(s):  
Benzoic Acid ◽  
Absorption Spectra ◽  
Ultraviolet Absorption
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