Transmittance, infrared

The hydrogen content Ch greatly influences structure and consequently electronic and optoelectronic properties. An accurate measurement of Ch can be made with several ion-beam-based methods see e.g. Arnold Bik et al. [54]. A much easier accessible method is Fourier-transform infrared transmittance (FTIR) spectroscopy. The absorption of IR radiation is different for different silicon-hydrogen bonding configurations. The observed absorption peaks have been indentified [55-57] (for an overview, see Luft and Tsuo [6]). The hydrogen content can be determined from the absorption peak at 630 cm , which includes... 

Figure 2.37 Infrared transmittance spectrum of a c. Spin-thick layer of water.

In ultraviolet spectroscopy the absorption bands appeared as maxima but in infrared spectroscopy the wave length is plotted against transmittance and hence the peaks appear as dips. In ultraviolet the absorbance is plotted against wave length while in the infrared transmittance is plotted wave length. 

P. Corti, G. CerameUi, E. Dreassi and S. Mattii, Near infrared transmittance analysis for the assay of sohd pharmaceutical dosage forms. Analyst, 124, 755-758 (1999). 

Eutaquio, A. Blanco, M. Jee, R.D. etal., Determination of paracetamol in intact tablets by use of near infrared transmittance spectroscopy Anal. Chim. Acta 1999, 383, 283-290. 

Fig. 14 Far-infrared transmittance spectra for rhombohedral (R) and orthorhombic (O) C60 polymers, and for C60 dimers, measured near 20 K. Curves are offset for clarity. Reprinted with permission from VC Long, JL Musfeldt, K Kamaras, GB Adams, JB Page, Y Iwasa, and WE Mayo, CFar-infrared vibrational properties of high-pressure high-temperature C60 polymers and the C60 dimer , Phys. Rev. B vol. 61 (2000) 13191-201 [100]. Copyright 2000 The American Physical Society...

Eustaquio A, Graham P, Jee RD, Moffatt AC, Trafford AD. 1998. Quantification of paracetamol in intact tablets using near-infrared transmittance spectroscopy. Analyst 123 2303-2306. 

Figure 5.1-9 Infrared transmittance spectra for the determination of impurities of oxygen and carbon in Si wafers (sample thickness 0.5 mm, resolution 4 cm ).

Figure 1. Infrared transmittance spectrum of Nafion 142 in the sodium form at low water content (about 0.15 H20 per — SOs ) and higher water content (about 4.0 H20 per —SOs ). The upper spectrum has been moved up the transmittance scale by 40%.

Figure 3. Infrared transmittance spectra of Nafion 142 in the acid form at low water content (A), intermediate (B), and high water content (C). Spectra A and B have been moved up the transmittance...

Figure 3.105 Infrared transmittance spectrum of PFA film (1.350 mm thickness).

Figure 3.107 Infrared transmittance spectrum of FEP film (1.344 mm thickness). ...

A high infrared transmittance is observed with materials consisting of molecules composed of heavy atoms, because their valence vibrations have the lowest frequen-... 

Figure 4. Optical image and two infrared images of a dividing cell (35 pm x 20 pm) obtained from IR spectromicroscopy. These chemical maps are derived from the strength of absorption bands from approximately 100 infrared transmittance spectra collected over the area of the dividing cell. The maximum in the color scale (yellow) represents the position of the maximum absorption by the cell, while the minimum (blue) represents no absorption by the cell. Strikingly, the intensity map of the amide II absorption band shows two peaks in the center of the two halves of the cell, representing the position of two separate nuclei before the cell division is complete. The intensity map of the C-H stretch absorption bands shows that lipids are concentrated at the contractil ring, where the cleavage furrow is located. [Used by permission of the National Academy of Sciences, U.S.A., from Jamin et al. (1998), Proc Natl Acad Sci, Vol. 95, Fig. 3, p. 4839.]...

Sierra et al. in 2007 conducted a study for the rapid prediction of the fatty acid (FA) profile of ground using near infrared transmittance spectroscopy (MT). The samples were scanned in transmittance mode from 850 to 1050 nm. MT spectra were able to accurately predict saturated R2=0,837, branched R2=0,701 and monounsaturated R2=0,852 FAs. Results were considered interesting because intramuscular fat content and composition influence consumer selection of meat products. 

Sierra, V. Aldai, N. Castro, P. Osoro, K. Coto-Montes, A. Oliva, M (2007). Prediction of the fatty acid composition of beef by near infrared transmittance spectroscopy. Meat Science Vol.78, pp. 248-255... 

Fig. 3.6. Solvents showing regions (white) of infrared transmittance over 10%. (McNiven and Court, 1970.)...

Fig. 17.12. Infrared transmittance through dried normal cucumber cotyledon lower epidermis. Wavelengths of principal peaks are identified. (Cochran et al, 1960.)...

Finney, E.E. and Norris, K.H., Determination of moisture in com kernel by near-infrared transmittance measurements, Trans. ASAE, 21 581-584 (1978). 

Figure 17.10 UV-Visible and near-infrared transmittance spectmm of a 200-fji,m thick bacterial cellulose membrane. The insert shows the magnification of the 250 00 nm range.

These instruments use near-infrared transmittance to give rapid results. For fat, infrared analyzers measure the radiation absorbed by the carbonyl groups of ester bonds in the acylglycerols (at 5.73 pm) or by the -CH groups (at 3.48 pm). For protein, the absorption at 6.46 pm by secondary amide groups is... 

When shaped into crucibles AIN can be used as a container for molten aluminium. It is a good electrical insulator, the resistivity exceeding IO12 ohm. cm at 25 °C. Modulus of rupture, 250 MN/m2 at 25°C and 120 MN/m2 at 1400 °C. Hardness, 1230 (KlOO). Aluminium Oxynitride. AlON is an infrared transmitter in the wavelength range 1 to 4pm. 

Figure 55. Beam path of a typical infrared microscope I = Infrared transmittance beam II = Infrared reflectance beam Ml =Condensing mirror M2 and M3= Cassegrain objectives M4 = Movable, semi-transparent mirror ...

Figure 5.27. The infrared transmittance spectrum (neat) of ethanoic anhydride (acetic any-dride) as a thin film between two sodium chloride (NaCl) windows. 

Figure 5.31. The infrared (transmittance) spectrum of propyl propanoate, CH3CH2CO2CH2 CH2CH3, neat, as a thin film.

R. Yabe. Near-infrared transmittance application for determining moisture content of surimi products. In Proc 2nd Inti NIRS Conf Tsukuba, Japan 190-195, 1989. 

T. Tajuddin, S. Watanab, K. Harada, S. Kawano. Application of near infrared transmittance spectroscopy to the estimation of protein and lipid contents in single seeds of soybean recombinant inbred lines for quantitative trait analysis. J Near Infrared... 

O. Hermansson. Prediction of new constituents in peas using near infrared transmittance In Making Light Work, Proceedings of the 4th. International conference on Near Infrared Spectroscopy, I. Murray, I. Cowe, co-eds. Ian Michael Puhhcations, Chichester, U.K, 1991, p. 236-238. 

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