LIFBASE is the first program on spectroscopy of diatomic molecules providing all the following features:

Comprehensive database capabilities:
- Absolute rovibrational Emission and Absorption coefficients.
- Variation of transition probabilities taking into account rovibrational wavefunctions and electronic transition moments.
- Rotational radiative lifetimes and tabulated predissociation rates.
- Frequencies for all rovibrational transitions.

Spectral Simulation:
- Optical emission, absorption, excitation laser-induced fluorescence.
- Thermal and non thermal population distributions.
- Line broadening.
- Interactive change of simulation parameters.
- Graphic interface.