The present subvolume provides evaluated infrared spectroscopic data on O3 (Ozone) and is dedicated to all available molecular constants in the electronic ground state, of the 18 isotopomers. It is made of separate chapters. The first one succinctly reports molecular theories and equations, based on which most of the evaluated data given in the other chapters are established. Title of each data chapter indicates which data is reported (vibrational states, vibrational energy, band centers, harmonic frequencies, anharmonic constants, rotational and centrifugal distortion constants, resonance coupling constants, potential energy function, force constants, dipole transition moment, integrated band intensity, line shape parameters...). The isotopic identification, the natural isotopic abundance, and the cited bibliographic references are also given in each data chapter.

Volume II/20 provides critically evaluated data on free molecules, obtained from infrared spectroscopy and related experimental and theoretical investigations. The volume is divided into four subvolumes, A: Diatomic Molecules, B: Linear Triatomic Molecules, C: Nonlinear Triatomic Molecules, D: Polyatomic Molecules. The present subvolume II/20 B3 deals with the linear triatomic nitrous oxide molecule, N2O (NNO). Both the normal isotopic species 14N14N16O and eleven of its isotopic varieties have been considered in this subvolume. The tables are preceded by an additional index to help the search for specific information. Subvolume B3 contains a CD-ROM. Further subvolumes are in preparation.

Volume II/20 provides critically evaluated data on free molecules, obtained from infrared spectroscopy and related experimental and theoretical investigations. The volume is divided into four subvolumes, A: Diatomic Molecules, B: Linear Triatomic Molecules, C: Nonlinear Triatomic Molecules, D: Polyatomic Molecules. All volumes contain a CD-ROM, further subvolumes are in preparation.

Volume II/20 provides critically evaluated data on free molecules, obtained from infrared spectroscopy and related experimental and theoretical investigations. The volume is divided into four subvolumes, A: Diatomic Molecules, B: Linear Triatomic Molecules, C: Nonlinear Triatomic Molecules, D: Polyatomic Molecules. The present subvolume II/20 b1 contains the general introduction and data for the linear triatomic molecules BClH+(HBCl+) ... COSe(OCSe), critically evaluated from the original literature up to 1994. Subvolume b2 containing data for CO2(OCO), subvolume b3 containing data for CS2(SCS) ... N3(NNN), and further subvolumes are in preparation.

The introduction essentially reports molecular theories and equations, on the basis of which most of the evaluated data are established. Specific comments related to some of the molecules considered in the subvolumes II/20B1-4 are retained in the present introduction due to their possible general applicability. Additional information of practical interest (list of symbols with their definitions, units, table of conversion factors, notations for the bands and energy levels, table of energy-related units and selected fundamental constants, etc.) is also given. The tables are preceded by an additional index to help the search for specific information. In order to keep their consistency and their optimum ability to reproduce data, molecular constants are reported when possible from the same calculation of a given set of measurements. The subvolume ends with a reference section.