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With the objective to collate the enormous amount of information on magnetic susceptibility parameters of a very large number of a variety of skeletons and present it in a form that can readily be retrieved and used, a new pattern is being introduced with the present volume keeping in view that now a majority of research groups look at the scientific data electronically.All the magnetic properties of each individual substance are listed as a single document which is self explainable and allowing search in respect of substance name, synonyms, common vocabulary, and even structure. It is hoped that the new pattern will facilitate greater accessibility of magnetic data.

The objective of this volume is to present a full and critical spectral data coverage of the entire major fields relating to tetraphenyl and analogous porphyrins, their precursors, catabolic derivatives, and related systems electronically.The porphyrins are an important class of naturally occurring macro cyclic compounds that play a very important role in the metabolism of living organisms. They have a universal biological distribution and were involved in the oldest metabolic phenomena on earth. Without porphyrins and their relative compounds, life as we know it would be impossible and therefore the knowledge of these systems and their excited states is essential in understanding a wide variety of biological processes, including oxygen binding, electron transfer, catalysis and the initial photochemical step in photosynthesis.

These tables are preceded by an additional index in order to facilitate the search for specific information.The tables report molecular constants and/or, below about 5000 cm-1, assigned experimental line positions, intensities, and shape related parameters.

The Landolt-Boernstein volume II/30 contains data on the geometric parameters (internuclear distances, bond angles, dihedral angles of internal rotation, etc.) of free polyatomic molecules including free radicals and molecular ions.

This volume contains data on the geometric parameters (internuclear distances, bond angles, dihedral angles of internal rotation etc.) of free polyatomic molecules including free radicals and molecular ions.

The porphyrins are an important class of naturally occurring macrocyclic compounds that play a very important role in the metabolism of living organisms.

The Landolt-Boernstein volume II/30 contains data on the geometric parameters (internuclear distances, bond angles, dihedral angles of internal rotation, etc.) of free polyatomic molecules including free radicals and molecular ions. Subvolume II/30A covers inorganic molecules and molecules containing one or two carbon atoms.

Volume II/26 supplements the previous compilations II/l, II/9 and II/17 of the magnetic properties of free radicals which were published in 1965, 1977-1980 and 1986-90.

With the development of modern instruments and theories, a considerable amount of spectroscopic informationis being permanently collected on molecules. It is made up of several volumes (A, B, C, D) with comprehensive compilation of critically evaluated molecular constants of diatomic (A), linear triatomic (B);

With the development of modern instruments and theories, a considerable amount of spectroscopic information is being permanently collected on molecules. It is made up of several volumes (A, B, C, D) with comprehensive compilation of critically evaluated molecular constants of diatomic (A), linear triatomic (B);

Volume II/26 supplements the previous compilations II/l, II/9 and II/17 of the magnetic properties of free radicals which were published in 1965, 1977-1980 and 1986-90.

Contains data for diatomic diamagnetic molecules. This title lists rotational and related constants, dipole moments, barriers to internal rotation, hyperfine coupling parameters, or Zeeman data in different tables.