By Leo Brewer (auth.), John L. Margrave (eds.)
It is a smart excitement to have the ability to honor our exceptional colleague, Professor Leo Brewer, at the social gathering of his sixty-fifth start day, with this targeted quantity of extreme temperature technological know-how. Leo and his spouse, Rose, are own pals of a number of generations of scholars and postdoctoral researchers on the collage of California at Berkeley. Their difficulty and figuring out has been vital to many folks during the last 40 years. each one paper during this quantity has not less than one writer who was once a gradu ate pupil or a postdoctoral researcher in Leo's laboratory at Berkeley. the range of issues is indicative of the wide-ranging technological know-how performed via Brewer-ites and through Leo Brewer himself. He has in my view participated within the answer of a number of the classical difficulties of high-temperature science-from the warmth of sublimation of graphite to the dissociation en ergy of nitrogen to the prediction of binary and ternary part diagrams. He and his scholars have made significant contributions to atomic and molec ular spectroscopy. He has made major contributions to the boost ment of effective structures for strength conversion and to ceramics. In addi tion to his learn actions, Leo Brewer has been a long-time player within the dynamic undergraduate instructing software of the Berkeley Chemistry division. He has supplied the most important perception for stu dents considering these career-shaping reviews that one endures whereas buying the fundamentals of inorganic, natural, and actual chemistry with that interwoven universal bond of thermodynamics.
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Additional info for Modern High Temperature Science: A Collection of Research Papers from Scientists, Post-Doctoral Associates, and Colleagues of Professor Leo Brewer in celebration of his 65th birthday
All of the low levels of the fS2 configurations have been observed except for the 5F1 level, which is calculated to be at 13,910 cm -1 with an uncertainty of several hundred cm- 1 • This is at a low enough energy that it would of some value to pin down the energy more accurately. The fd 2s configuration has been fit rather well. The only unobserved levels, 7FO, calculated at 16,320, and 5F1, calculated at 16,690, have low enough degeneracies and high enough energies to be of no concern. For fds 2 , there are five levels that are unobserved between 15,190 and 16,690 that do not contribute significantly to the uncertainty, but there are three levels: 5DO at 13,710, 5F4 at 14,440, and 3D1 at 14,830 cm-I, that are unobserved and that are the limitations to the accuracy of the thermodynamic calculations.
Within the uncertainty limits, Dg(FeO) derived from ref. (18) is then in agreement with the other data. A relative ionization cross-section for FeO(g) lower than for Fe(g) is consistent with observations for several. oxides and other binary molecules (12). Turning to spectroscopic data, Birge Sponer extrapolation with the molecular constants cited in the appendix yields Dg(FeO) = 118 kcal mol-I, as before (2, 3) appreciably higher than the thermochemical results, but not high enough to correspond to convergence to the Feep) + High Temperature Science Vol.
047 at 3000 K. 001 because of the uncertainty of the two estimated levels. Th: Oetting et al. (35) have calculated thermodynamic values based on the observed levels tabulated by Zalubas (36) in 1968. 2 em-I, respectively. The 1976 publication by Zalubas (38) lists all of the observed levels used here and they are not reproduced here. The present calculations are based on the thirty-one even levels observed below 18,430 cm- 1 and the thirty-two odd levels observed below 18,380 cm- 1 plus an estimated value of 17,000 ± 1000 cm- 1 for the fds 2 IF3 level.