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Frank J. Lovas, Eberhard Tiemann,¹
J. S. Coursey, S. A. Kotochigova, J. Chang, K. Olsen, and R. A. Dragoset

NIST Physical Measurement Laboratory

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These tables represent the first part of a series of critical reviews on the microwave spectra of molecules. All of the rotational spectral lines observed and reported in the open literature for 121 diatomic molecules have been tabulated. The isotopic molecular species, assigned quantum numbers, observed frequency, estimated measurement uncertainty, and reference are given for each transition reported. In addition to rectifying a number of misprints and errors in the literature cited. The derived molecular properties, such as rotational constants, hyperfine structure constants, electric dipole moments, rotational g-factors and internuclear distances are listed with one standard deviation uncertainties for all species.

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0. Introduction
1. General Description of the Tables
2. ¹Σ-Ground State Molecules
3. ³Σ-Ground State Molecules
4. ²Π-Ground State Molecules
5. Evaluation of the Spectral Data
6. Molecular Constant and Spectral Line Tables
7. Equilibrium Internuclear Distances
8. Acknowledgments
9. References to the Text

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