With the development of modern instruments and theories, a considerable amount of spectroscopic informationis being permanently collected on molecules. The infrared, in particular, is seeing extraordinary activities. Using Fourier transform interferometers and infrared lasers, accurate data are measured often with extreme sensitivity. These data are also analyzed and precise molecular parameters determined. Volume II/20, "Molecular Constants Mostly from Infrared Spectroscopy," is a recent Landolt-Bornstein publication series bringing together these results. It is made up of several volumes...

With the development of modern instruments and theories, a considerable amount of spectroscopic information is being permanently collected on molecules. The infrared, in particular, is seeing extraordinary activities. Using Fourier transform interferometers and infrared lasers, accurate data are measured often with extreme sensitivity. These data are also analyzed and precise molecular parameters determined. Volume II/20, Molecular Constants Mostly from Infrared Spectroscopy, is a recent Landolt-Bornstein publication series bringing together these results. It is made up of several volumes...

The present subvolume provides evaluated data from HD¹⁶O, HT¹⁶O, HD¹⁷O, HD¹⁸O, and DT¹⁶O isotopologues. The introduction is intended to give a quicker access to the meanings of symbols found in the data tables. It reports molecular theories and equations, based on which most of the evaluated data given in the tables are established. 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...