Bounds for iterates, inverses, spectral variation and fields of values of non-normal matrices

Fields of values and the ADI method for

Fields of values and the ADI method for non-normal matrices

✍ Gerhard Starke 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 865 KB

The normal coordinate analysis of porphi

The normal coordinate analysis of porphin and its derivatives based on the solution of the inverse spectral problem for porphin and Cu porphin—I. A valence force field for in-plane vibrations of the porphin molecule

✍ L.L. Gladkov; K.N. Solovyov 📂 Article 📅 1985 🏛 Elsevier Science 🌐 English ⚖ 620 KB

The inverse spectral problem for porphin is solved by the regularized least squares method. For determining 30 force constants related to in-plane molecular vibrations, 256 frequencies of porphin and its four deuteratcd derivatives are used. The form of the porphin molecule vibrations is discussed.