Abstract
The Hamiltonian of internal rotation about theC2 axis in the HNO3 molecule and its H/D-, O18/O16-, and N15/N14-isotopomers was reconstructed using the results of quantumchemical calculations. The Fermi resonance between the torsional (2v9) and ONO bending (v5) vibrations is a characteristic feature of the molecule. Tunneling splittings in the ground and excited states were calculated using the perturbative instanton approach. Abnormally large changes in the splittings upon isotope substitution of heavy atoms are predicted.
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