Infra-red spectra and spectral shifts of CO adsorbed on evaporated alkali-halides. Part 2.—Films of caesium salts

1971 ◽  
Vol 67 (0) ◽  
pp. 2686-2698 ◽  
Author(s):  
R. Gevirzman ◽  
Y. Kozirovski
Keyword(s):  
Alkali Halides ◽  
Spectral Shifts ◽  
Infra Red

Absorption and Infra-Red Emission of Nickel and Cobalt Doped Alkali Halides

1968 ◽  
Vol 30 (1) ◽  
pp. 97-103 ◽  
Author(s):  
M. L. Reynolds ◽  
W. E. Hagston ◽  
G. F. J. Garlick
Keyword(s):  
Alkali Halides ◽  
Red Emission ◽  
Infra Red

Infra-red luminescence of metastable electron excess centers in alkali halides

1975 ◽  
Vol 16 (7) ◽  
pp. 957-959 ◽  
Author(s):  
J.M. Ortega ◽  
P. Lagarde ◽  
Y. Farge
Keyword(s):  
Alkali Halides ◽  
Infra Red ◽  
Red Luminescence

Infra-red studies of water adsorbed on alkali halides

1958 ◽  
Vol 247 (1251) ◽  
pp. 467-468 ◽  
Keyword(s):  
Metal Ion ◽  
Relative Size ◽  
Negative Ions ◽  
Alkali Halides ◽  
Adsorbed Water ◽  
Positive Ions ◽  
Air Temperatures ◽  
Infra Red ◽  
Stretching Vibration ◽  
Straight Lines

sed disks formed from finely powdered alkali halides act as matrices of large ce area on which the infra-red spectra of thin films of adsorbed water can be eniently studied. While completely transparent to visible and infra-red radia- electron micrographs show that the disks are mosaics of tiny crystals about n diameter packed very closely together. Satisfactory disks can be made from halide formed from Na, K, Rb and Cs with Cl, Br and I and spectroscopic ies have been made on water adsorbed on all twelve of these matrices. In this it is possible to follow the effect of the variation of size and electronegativity Le crystal ions on the water bands. The spectra have been examined under high lution both at room and liquid-air temperatures. Figure 40 shows the frequency of the strongest band in the 3000 to 3500 cm -1 ion plotted as ordinate against a unitary displacement of the negative halogen as abscissa. Straight lines join the bands with a common metal ion. The band responds to a modified asymmetrical stretching vibration of the water molecule. graphs indicate that the greatest shift in frequency relative to the free lecule is produced by the lattice with the halogen of greatest electronegativity the metal ion of lowest electropositive character. This indicates that the water attached by hydrogen bonding to the negative ions. This is supported by considerations of the relative size of the ions. The positive ions, particularly tho of sodium and potassium, being smaller, tend to be buried in the structure by t negative ions and are relatively inaccessible from the outside.

Infra-Red Color Center Bands in the Alkali Halides

1949 ◽  
Vol 76 (8) ◽  
pp. 1254-1254 ◽  
Author(s):  
E. Burstein ◽  
J. J. Oberly
Keyword(s):  
Color Center ◽  
Alkali Halides ◽  
Red Color ◽  
Infra Red

Infra-red spectra of CO2 adsorbed on evaporated alkali halides

1966 ◽  
Vol 62 ◽  
pp. 1431 ◽  
Author(s):  
Y. Kozirovski ◽  
M. Folman
Keyword(s):  
Alkali Halides ◽  
Infra Red

Electron Microscopy of Human Gallstones

1971 ◽  
Vol 29 ◽  
pp. 296-297
Author(s):  
C. Wolpers ◽  
R. Blaschke
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bile Pigment ◽  
X Ray Diffraction ◽  
Triclinic Crystal System ◽  
X Ray ◽  
Follow Up Study ◽  
Infra Red ◽  
Main Components

Scanning microscopy was used to study the surface of human gallstones and the surface of fractures. The specimens were obtained by operation, washed with water, dried at room temperature and shadowcasted with carbon and aluminum. Most of the specimens belong to patients from a series of X-ray follow-up study, examined during the last twenty years. So it was possible to evaluate approximately the age of these gallstones and to get information on the intensity of growing and solving.Cholesterol, a group of bile pigment substances and different salts of calcium, are the main components of human gallstones. By X-ray diffraction technique, infra-red spectroscopy and by chemical analysis it was demonstrated that all three components can be found in any gallstone. In the presence of water cholesterol crystallizes in pane-like plates of the triclinic crystal system.

Sign in / Sign up

Export Citation Format

Share Document