No abstract available

No abstract available

No abstract available

[en] Short note

[en] Short note

[en] Concept of fσ promotion, which implies a ligand-field stimulated promotion of an electron from compact 4f orbital onto extended σ₆^s orbital, capable of effective overlapping and new bond formation, is formulated for f-element compounds on the bsis of analysis of ionization energies of rare earth monofluoride molecules. The concept suggested explains naturally many peculiarities of f-element compounds

[en] Published in summary form only

No abstract available

[en] Adiabatic ionization energies of NdF, GdF, TbF, HoF, ErF, and TmF molecules, which constitute 4.91(7), 6.16(7), 6.13(7), 6.02(7), 6.31(7), and 5.87(7) eV, respectively, are determined by means of electron impact with mass-spectrometric recording

[en] All objectives of the program were accomplished. A satisfactory filter medium was developed whose corrosion resistance was demonstrated in both laboratory tests and in full scale engineering tests of filters made with the medium. Manufacturability was demonstrated by producing several rolls on a 31-in. Foudrinier and 27-in. Rotoformer, and by preparing a detailed description of the procedure. This procedure was reviewed by three paper manufacturers, Bowaters, Inc., Knowlton Brothers Inc., and Holingsworth and Vose Co.; Holingsworth and Vose was the only one with experience in the production of high efficiency air filter papers. The concensus of these reviewers was that, although the procedure described is complicated, it can serve as the basis for developing full-scale commercial procedures for the manufacture of this material. (U.S.)