T h e 1S value for the variation in the relative areas o f the constituent M 6 s s b a u e r patterns can be observed. T h e relative area o f the m a g n e t i c sextets d e c r e a s e s with increasing, both the iron content Fig.
T h e three subspectra typical for the 4. T h e Table 2 b Room temperature M6ssbauer results 1. I Fig. V, Kuncser et ai. The remaining 0. In this way we considered two unequivalent iron coordi- 0. The present results would suggest two Debye temperatures To.
The 4. RT overlapping with the one existing over the Waller factor of each component. In Table i the results for whole temperature range.
Consequently the portion of the the relative areas of the subspectra fitting the K and subspectra at 4. For 4. Data corroboration 1. The same trend was found for the area of both the singlet from the M6ssbauer spectra and the second peak, at higher wavelengths in the absorption spectra. Both areas increase with the iron content. Conclusions between 0. For the 8 wt. The absorption probabili- f ,.
That from Table 2 at: 4. Debye tempera:ture [ Using the relations 6 , 7 and between the university of Duisburg and the Institute of 10 we finally come to the expression: Physics and Technology of Marcia!
We also thank to Prof. Petru Palade and Mrs. Plap- ceanu Carmen during the discussion of the manuscript. The experimental values for these ratios are given in Table I and Table 2. The main source of errors in the experimental data from the high degree of overlap of the different components, both in the optical and in the References M'6ssbauer spectra. Also, one of the most sensitive po.
Sukegawa, S, Sugawara, K. Murase, Electronics and Comm. Burke, Appl. Mazakova, M. Pantcheva, J. InformationRecording Materials 18 be considered, too. I Journal of Alloys and Compounds 2f6 [4] S.
Manivannan, O. Nikolov, T. Kardinahl, W. Kvune, H. R [5] J. Couture, R,A. Changkakoti, R. SPIE Proc. M Polikanin, V. Franke, T, Kardinahl, G. Mannivannan, J. Caio Y. Tang, H. Dai, L. SP E Proc. F, Erickson, The M6ssbauer effect and its application in chemis- Gould Ed. Series 68, Am. Mannivannan0 R. Related Papers. Investigation of the light induced refractive index changes in Fe:PVA. By Victor E Kuncser and G. Optical induced modifications in thin films of Fe:PVA. The smoothed curve superimposed on the experimental data A 0.
In this case, the result is very similar to that ob- B 0. From these results the lines were identified with those B 0. The deconvolved tensities of the spectra. In fact, the iron ions in the magnetite spinel structure pres- 1. Jones and K. Shimokoshi, Appl. Shimokoshi and R. Jones, Appl. In the 3. Friesen and K. Michaelian, Appl. Ohyabu and Y. Ujihara, J. Kundig, Nuclear Instrum. Kanzaki and T. Katsura, submitted to J. E and F, respectively, in Fig. Kauppinen, D.
Mantsch, and D. Debendetti, G. Lang, and R. Ingalls, Phys. However, this technique presents challenging demands on the data reduction pro- The analysis of mixtures using any spectroscopic tech- cess to increase the reliability of the analytical results. The problems nique becomes trivial when absorption regions of one unique to this method which make data reduction difficult are discussed. The wide acceptance of the atom- iterative coefficient weighted least-squares approach are compared.
Data ic absorption technique is in part due to the fact that indicating the relative performance of these methods are presented. Optoacoustic Spectroscopy is theoretically a sensitive Most present-day optoacoustic systems employ a low- technique 1 capable of quantitatively determining a wide pressure IR molecular gas laser as the light source.
Be- variety of gases. However, there has been little work cause of the nature of these laser sources, only a discrete directed towards the utilization of optoacoustic spec- number of laser lines may be selected.
This can limit the troscopy for the analysis of gas mixtures. This is espe- ability of the analyst to find a laser line where only one cially true in cases where a large amount of spectral component of the gas mixture will absorb, although it is overlap exists between the components of a gas mixture. Box , Cleveland, OH Reductive transformation and mineralization of an azo dye by hydroxysulphate green rust preceding oxidation using H2O2 at neutral pH By Christian Ruby.
Lim et al.
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