Investigation of electronic structure of allenyl ethers by means of photoelectron and UV spectroscopy

1990 ◽  
Vol 39 (1) ◽  
pp. 69-75
Author(s):  
L. M. Sinegovskaya ◽  
S. V. Eroshchenko ◽  
O. A. Tarasova ◽  
Yu. L. Frolov ◽  
S. V. Amosova ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Uv Spectroscopy

scholarly journals Diastereo-specific conformational properties of neutral, protonated and radical cation forms of (1R,2S)-cis- and (1R,2R)-trans-amino-indanol by gas phase spectroscopy

2015 ◽  
Vol 17 (39) ◽  
pp. 25809-25821 ◽  
Author(s):  
Aude Bouchet ◽  
Johanna Klyne ◽  
Giovanni Piani ◽  
Otto Dopfer ◽  
Anne Zehnacker
Keyword(s):  
Electronic Structure ◽  
Gas Phase ◽  
Radical Cation ◽  
Amino Alcohol ◽  
Uv Spectroscopy ◽  
Conformational Properties ◽  
Gas Phase Spectroscopy ◽  
Ir And Uv Spectroscopy

The effects of ionisation and protonation on the geometric and electronic structure of a prototypical aromatic amino-alcohol with two chiral centres are revealed by IR and UV spectroscopy.

Electronic Structure of NO2 Studied by Photoelectron and Vacuum‐uv Spectroscopy and Gaussian Orbital Calculations

1970 ◽  
Vol 53 (2) ◽  
pp. 705-715 ◽  
Author(s):  
C. R. Brundle ◽  
D. Neumann ◽  
W. C. Price ◽  
D. Evans ◽  
A. W. Potts ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Uv Spectroscopy ◽  
Vacuum Uv ◽  
Gaussian Orbital

IR and UV spectroscopy and the spatial and electronic structure of the dipyridyl N-oxides

1980 ◽  
Vol 29 (5) ◽  
pp. 740-746 ◽  
Author(s):  
G. V. Kireev ◽  
V. B. Leont'ev ◽  
Yu. V. Kurbatov ◽  
O. S. Otroshchenko ◽  
A. S. Sadykov
Keyword(s):  
Electronic Structure ◽  
Uv Spectroscopy ◽  
Ir And Uv Spectroscopy

scholarly journals Tert-butyl esters of 2,3-diaryl-3-arylaminopropanoic acids - stereoselective synthesis, isolation, spectroscopic and structural elucidation

2011 ◽  
Vol 13 (3) ◽  
pp. 12-17 ◽  
Author(s):  
Donka Tasheva ◽  
Sonya Zareva
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Stereoselective Synthesis ◽  
Uv Spectroscopy ◽  
Structural Elucidation ◽  
Butyl Esters ◽  
H Nmr ◽  
Spectroscopic Characteristics

Tert-butyl esters of 2,3-diaryl-3-arylaminopropanoic acids - stereoselective synthesis, isolation, spectroscopic and structural elucidation A series of seven substituted tert-butyl esters of 2,3-diaryl-3-arylaminopropanoic acids has been synthesized, isolated, spectroscopically and structurally elucidated. An influence of the substituents on the spectroscopic characteristics and conformations is discussed using the data of the linear-polarized IR- (IR-LD), UV-spectroscopy and 1H-NMR. Theoretical quantum chemical calculations are carried out, with a view to explaining and supporting the experimental optical properties and the electronic structure. The stereoselective synthesis of the corresponding diastereoisomers is optimized, thus giving good yields (62-72%) and purity of the compounds

EELS Measurement of the Local Electronic Structure of Copper Atoms Segregated to Aluminum Grain Boundaries

1996 ◽  
Vol 54 ◽  
pp. 342-343
Author(s):  
S.J. Splinter ◽  
J. Bruley ◽  
P.E. Batson ◽  
D.A. Smith ◽  
R. Rosenberg
Keyword(s):  
Electronic Structure ◽  
Grain Boundaries ◽  
Boundary Segregation ◽  
Thin Layers ◽  
Nominal Composition ◽  
Spatially Resolved ◽  
Service Lifetime ◽  
Heat Treated ◽  
Probe Size ◽  
Local Electronic Structure

It has long been known that the addition of Cu to Al interconnects improves the resistance to electromigration failure. It is generally accepted that this improvement is the result of Cu segregation to Al grain boundaries. The exact mechanism by which segregated Cu increases service lifetime is not understood, although it has been suggested that the formation of thin layers of θ-CuA12 (or some metastable substoichiometric precursor, θ’ or θ”) at the boundaries may be necessary. This paper reports measurements of the local electronic structure of Cu atoms segregated to Al grain boundaries using spatially resolved EELS in a UHV STEM. It is shown that segregated Cu exists in a chemical environment similar to that of Cu atoms in bulk θ-phase precipitates.Films of 100 nm thickness and nominal composition Al-2.5wt%Cu were deposited by sputtering from alloy targets onto NaCl substrates. The samples were solution heat treated at 748K for 30 min and aged at 523K for 4 h to promote equilibrium grain boundary segregation. EELS measurements were made using a Gatan 666 PEELS spectrometer interfaced to a VG HB501 STEM operating at 100 keV. The probe size was estimated to be 1 nm FWHM. Grain boundaries with the narrowest projected width were chosen for analysis. EDX measurements of Cu segregation were made using a VG HB603 STEM.

Electronic structure studies of conducting polymers by electron energy-loss spectroscopy

1996 ◽  
Vol 54 ◽  
pp. 160-161
Author(s):  
J. Fink
Keyword(s):  
Electronic Structure ◽  
Conducting Polymers ◽  
Conjugated Polymers ◽  
Electron Acceptors ◽  
Electron Donors ◽  
Light Emitting ◽  
One Dimensional ◽  
New Class ◽  
Electrical Conductivities ◽  
Electron Energy Loss

Conducting polymers comprises a new class of materials achieving electrical conductivities which rival those of the best metals. The parent compounds (conjugated polymers) are quasi-one-dimensional semiconductors. These polymers can be doped by electron acceptors or electron donors. The prototype of these materials is polyacetylene (PA). There are various other conjugated polymers such as polyparaphenylene, polyphenylenevinylene, polypoyrrole or polythiophene. The doped systems, i.e. the conducting polymers, have intersting potential technological applications such as replacement of conventional metals in electronic shielding and antistatic equipment, rechargable batteries, and flexible light emitting diodes.Although these systems have been investigated almost 20 years, the electronic structure of the doped metallic systems is not clear and even the reason for the gap in undoped semiconducting systems is under discussion.

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