![]() when they used FeVC alloys to correlate between plasma temperature (T e), ionic to atomic line intensity ratio and the surface hardness. This work was confirmed in 2014 by Aberkane et al. van der Horst, P.J.M van Bentrum, Physica B, pp. The authors were able to observe a direct relation between the micro-hardness of the samples, and the plasma excitation temperature. Which type of line is observed depends on the type of material and its temperature relative to another emission source. Bleaney, in Foundations of Modern EPR, G. Spectra lines - A spectral line may be observed either as an emission line or an absorption line. Engel, Quantum Chemistry and Spectroscopy. Halpern, in Oxygen Transport to Tissue, Ed., Ch. Borg, Biological Applications of Electron Spin Resonance (Wiley, New York, 1972). Hausser, Naturwissenschaften 47, 251 (1960) In our measurements, H and H are used for the deter- mination of the electron temperature. A summary of the relevant literature is presented here as a resource for the O 2 measurement community. Table 1 presents the spectral line data of hydrogen Balmer series. been measured based on the line intensity ratio of the vis- ible spectrum by employing the Boltzmann plot method, assuming that the plasma is in a local. There has been no prior review of the EPR spectra and electron spin relaxation of O 2 in the gas phase, dissolved in fluid solution, and in frozen solutions. All of these measurements correctly assume that the O 2 electron spin relaxation time is short relative to the relaxation time of the sensor molecules. Download scientific diagram Natural logarithm of the intensity ratios of five lines present in all 12 spectra are plotted against 1/kT (in cm), where T is the temperature. A large literature has developed about in vivo O 2 measurements using nitroxyl radicals, triarylmethyl radicals (trityl, TAM), carbon particles, and analogues of lithium phthalocyanine (LiPc). Various aspects of the effect of O 2 on biological EPR and on the biological systems have been studied. The effect of O 2 on CW EPR spectra and on relaxation times has been applied to the problem of measuring O 2 concentration in vivo. Hausser and Deguchi published spectra illustrating the effect. Freed showed Hausser the effect of degassing solutions on the hyperfine of DPPH. Room-temperature spectra are compared with laboratory measurements and data. It has been known from the pioneering and approximately simultaneous work of Freed and Frankel, Hausser and Deguchi (1959–1960) that collisions with O 2 in fluid solutions broaden the electron paramagnetic resonance (EPR) spectra of free radicals. line intensity ratio gives an electron temperature of 3.4 x 10 6 K.
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