Fine Structure of the Near Infra-Red Absorption Bands of the Halogen Acids

1920 ◽  
Vol 51 ◽  
pp. 230 ◽  
Author(s):  
Walter F. Colby
Keyword(s):  
Fine Structure ◽  
Absorption Bands ◽  
Infra Red

Vibration-rotation bands of methane

1952 ◽  
Vol 213 (1112) ◽  
pp. 42-54 ◽  
Keyword(s):  
Complex System ◽  
Absorption Spectrum ◽  
Fine Structure ◽  
Resolving Power ◽  
Absorption Bands ◽  
Infra Red ◽  
Vibration Rotation

The infra-red absorption spectrum of methane 12 CH 4 in the region of 3 μ has been re-investigated with higher resolving power than has been used previously. A very complex system of overlapping vibration bands has been revealed. The rotational fine structure of these bands has been partially analyzed, particularly having regard to the Coriolis interactions which occur in this case. The corresponding absorption bands of 13 CH 4 have also been examined.

Investigation of the fine structure in overtone absorption bands of 12C2H4

1999 ◽  
Vol 97 (1) ◽  
pp. 265-277 ◽  
Author(s):  
M. BACH, R. GEORGES, M. HERMAN, A. PER
Keyword(s):  
Fine Structure ◽  
Absorption Bands

The infra-red spectrum and molecular configuration of sodium deoxyribonucleate

1957 ◽  
Vol 239 (1219) ◽  
pp. 446-463 ◽  
Keyword(s):  
Relative Humidity ◽  
Vapour Phase ◽  
Molecular Configuration ◽  
Absorption Bands ◽  
Oriented Films ◽  
Infra Red ◽  
Modes Of Vibration ◽  
Water Measurement ◽  
Phosphate Groups ◽  
Polarized Radiation

The infra-red spectra of oriented films of sodium deoxyribonucleate have been investigated between 700 and 4000 cm -1 using polarized radiation and under varying degrees of relative humidity. Similar spectra have been obtained when the films have been deuterated by vapour-phase exchange with heavy water. It is found that the infra-red dichroism of nearly every band increases with the relative humidity. Many of the principal absorption bands can be assigned to separable modes of vibration in the bases, the phosphate groups or the absorbed water. Measurement of the dichroic ratios of certain of these bands indicates that at high relative humidity the bases must be nearly perpendicular to the orientation direction. The configuration deduced for the phosphate groups is unlike that proposed in the Crick-Watson model, but is in essential agreement with that recently proposed by Wilkins and his co-workers. Some observations are also reported on the corresponding spectra of sodium ribonucleate. Since no dichroism was observed, no conclusions can be drawn regarding the molecular configuration of this polymer.

Fine Structure in the Far Infra-Red Spectrum of NH3

1941 ◽  
Vol 59 (2) ◽  
pp. 171-173 ◽  
Author(s):  
H. M. Foley ◽  
H. M. Randall
Keyword(s):  
Fine Structure ◽  
Infra Red

Local Structure and Er3+ Emission from Pseudo-Amorphous GaN:Er Thin Films

1998 ◽  
Vol 536 ◽  
Author(s):  
S. B. Aldabergenova ◽  
M. Albrecht ◽  
A. A. Andreev ◽  
C. Inglefield ◽  
J. Viner ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Amorphous Matrix ◽  
Broad Band ◽  
Resonant Absorption ◽  
Absorption Bands ◽  
Host Matrix ◽  
Transmission Electron ◽  
Infra Red ◽  
Band Edge Luminescence

AbstractWe report on strong Er3+ luminescence in the visible and infra-red regions at room temperature in amorphous GaN:Er thin films prepared by DC magnetron co-sputtering. The intensity of the Er3+ luminescence at 1.535 μm corresponding to 4I13/2 → 4I15/2 transitions is greatly enhanced after annealing at 750°C. In this material GaN crystallites have formed and embedded in the continuous amorphous matrix. The crystallites are 4 to 7 nm in diameter as analyzed by high resolution transmission electron microscopy. The absorption edge, extending three orders of magnitude in absorption coefficient in the spectral range from 0.5 to 3.5 eV, is superimposed on resonant absorption bands of Er3+ ions.The total photoluminescence spectrum consists of welldefined Er3+ luminescence peaks imposed on a broad band edge luminescence from the amorphous GaN host matrix.

The Influence of Slit-Width on the Shape and Intensity of Infra-Red Absorption Bands

1951 ◽  
Vol 4 (2) ◽  
pp. 172
Author(s):  
JB Willis
Keyword(s):  
Experimental Data ◽  
Half Width ◽  
Slit Width ◽  
Absorption Bands ◽  
Infra Red ◽  
Spectrometer Slit

Making certain assumptions as to the shape of infra-red absorption bands and the shape of the slit function of the monochromator, expressions are obtained for the dependence on spectrometer slit-width of the intensity and half-width of absorption bands. Experimental data to confirm the accuracy of these deductions are presented.

scholarly journals Forensic Examination of Inks Extracted from Printed Documents using Fourier Transform Infrared Spectroscopy

2018 ◽  
pp. 10-17
Author(s):  
Paul Ocheje Ameh ◽  
Musa Suud Ozovehe
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Alkyd Resin ◽  
Epoxy Resins ◽  
Ftir Spectra ◽  
Absorption Bands ◽  
Triarylmethane Dyes ◽  
Infra Red ◽  
Aliphatic Ester

Yellow, cyan, magenta and black inks were extracted from documents printed using two common brands of printing cartridge in Nigerian market and analyzed to identify / compare the functional groups present using Fourier Transform Infra-red Spectroscopy (FTIR). The FTIR spectra obtained were found to show highly characteristic absorption bands depending on the composition of the printer inks. Also, the results indicated the presence of triarylmethane dyes, epoxy resins, alkyd resin and esters in all the inks as they are peaks assigned to the vibration of aliphatic ester, asymmetrical and symmetrical stretching. The pure ink and its extract from the same band were also found to exhibit similar FTIR spectra while inks extract from different brands exhibits marked difference in absorption bands. This research can provide valuable information if an admitted sample is provided for comparing with the suspect printed document.

scholarly journals Infrarotmessungen zur Ring-Ketten-Struktur des amorphen Selens

1972 ◽  
Vol 27 (8-9) ◽  
pp. 1246-1251 ◽  
Author(s):  
H. Gobrecht ◽  
G. Willers ◽  
D. Wobig ◽  
J. Zirre
Keyword(s):  
Amorphous Selenium ◽  
Absorption Bands ◽  
Additional Absorption ◽  
Ring Molecules ◽  
Polymeric Chains ◽  
Infra Red

Abstract The infra-red spectrum of red amorphous selenium has been studied in the region of 1 μm to 25 μm. The formation of Se8-ring molecules as well as polymeric chains Sen has been observed by investigating non-fundamental vibrations. Additional absorption bands at 7.85 μm (1274 cm-1), 8.95/9.35 μm (1117/1070 cm-1) and 12.35 μm (810 cm-1) are reported. They are assigned to multiphonon processes of the type E fundamental of Sen at 74.1 μm (135 cm-1).

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