Vibrational structure of electronic states in alkali-silicate glasses

2004 ◽  
Vol 1 (11) ◽  
pp. 2912-2915 ◽  
Author(s):  
D. A. Zatsepin ◽  
A. F. Zatsepin ◽  
V. I. Solomonov ◽  
S.O. Cholakh
Keyword(s):  
Electronic States ◽  
Vibrational Structure ◽  
Silicate Glasses ◽  
Alkali Silicate

Influence of impurity ions on nonlinear coloration of alkali silicate glasses

1996 ◽  
Author(s):  
Oleg M. Efimov ◽  
Yurii A. Matveev ◽  
Andrei M. Mekryukov
Keyword(s):  
Silicate Glasses ◽  
Alkali Silicate ◽  
Impurity Ions

scholarly journals The Influence of Environment in the Alteration of the Stained-Glass Windows in Portuguese Monuments

Heritage ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 365-376 ◽  
Author(s):  
Teresa Palomar ◽  
Pedro Redol ◽  
Isabel Cruz Almeida ◽  
Eduardo Pereira da Silva ◽  
Marcia Vilarigues
Keyword(s):  
Analytical Techniques ◽  
Soda Lime ◽  
Silicate Glasses ◽  
High Humidity ◽  
Atmospheric Conditions ◽  
Stained Glass ◽  
Mixed Alkali ◽  
Alkali Silicate ◽  
High Humidity Environment ◽  
Humidity Environment

This work presents the results of the exposure of soda-lime, potash-lime and mixed-alkali silicate glasses during ten and twenty months in different Portuguese monuments with historical stained-glass windows to characterize the influence of local environmental conditions. The glass samples were exposed in the Monastery of Batalha (Batalha), the Monastery of Jerónimos (Lisbon), and the Cathedral of Évora (Évora). A set of analytical techniques to assess the physicochemical effects were used, including optical microscopy and Fourier transform infrared spectroscopy. All the samples presented crystalline deposits on their surface; however, their quantity and nature depended on the atmospheric conditions during the days before the collection. Potash-lime silicate glass was the most altered glass in comparison with soda-lime and mixed-alkali silicate glasses. The samples from the Cathedral of Évora showed a high content of dust and salts on their surface but without severe chemical pathologies; however, those samples exposed in the Monastery of Jerónimos and the Monastery of Batalha presented alteration layers due to a high humidity environment.

THE ABSORPTION SPECTRUM OF CF2

1967 ◽  
Vol 45 (7) ◽  
pp. 2355-2374 ◽  
Author(s):  
C. Weldon Mathews
Keyword(s):  
Absorption Spectrum ◽  
Electronic State ◽  
Ground State ◽  
Band System ◽  
Electronic States ◽  
Vibrational Structure ◽  
Rotational Structure ◽  
Transition Moment ◽  
High Dispersion ◽  
Parallel Type

The absorption spectrum of CF2 in the 2 500 Å region has been photographed at high dispersion, and the rotational structure of a number of bands has been analyzed. The analysis of the well-resolved subbands establishes that these are perpendicular- rather than parallel-type bands, as previously assigned. Further analysis shows that the upper and lower electronic states are of 1B1 and 1A1symmetries respectively, corresponding to a transition moment that is perpendicular to the plane of the molecule. In the upper electronic state, r0(CF) = 1.32 Å and [Formula: see text], while in the ground state, r0(CF) = 1.300 Å and [Formula: see text]. An investigation of the vibrational structure of the band system has shown that the vibrational numbering in ν2′ must be increased by one unit from earlier assignments, thus placing the 000–000 band near 2 687 Å (37 220 cm−1). A search between 1 300 and 8 500 Å showed two new band systems near 1 350 and 1 500 Å which have been assigned tentatively to the CF2 molecule.

Colour Centres in Alkali Silicate Glasses.

1955 ◽  
Vol 3 (3_4) ◽  
pp. 255-260
Author(s):  
A. Kats ◽  
J. M. Stevels
Keyword(s):  
Silicate Glasses ◽  
Colour Centres ◽  
Alkali Silicate

The density of alkali silicate glasses over wide compositional ranges

1998 ◽  
Vol 239 (1-3) ◽  
pp. 197-202 ◽  
Author(s):  
B. Tischendorf ◽  
C. Ma ◽  
E. Hammersten ◽  
P. Venhuizen ◽  
M. Peters ◽  
...  
Keyword(s):  
Silicate Glasses ◽  
Alkali Silicate

Infrared Absorption of Some Alkali Borate and Alkali Silicate Glasses Containing Nickel & Iron Oxides

Silicon ◽  
2015 ◽  
Vol 9 (4) ◽  
pp. 555-561 ◽  
Author(s):  
A. M. Fayad ◽  
I. M. El-Kashef ◽  
F. A. Moustaffa
Keyword(s):  
Iron Oxides ◽  
Infrared Absorption ◽  
Silicate Glasses ◽  
Nickel Iron ◽  
Alkali Silicate

Cr3+–Tm3+ energy transfer in alkali silicate glasses

2001 ◽  
Vol 323-324 ◽  
pp. 759-762 ◽  
Author(s):  
U.R Rodrı́guez-Mendoza ◽  
V.D Rodrı́guez ◽  
I.R Martı́n ◽  
V Lavı́n ◽  
J Méndez-Ramos ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Silicate Glasses ◽  
Alkali Silicate
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