1D potential energy surfaces of HCOOH as function of the OH torsional angle φ1. Bottom panel: ground S0 electronic state. Top panel: excited S1 state. 1D cuts were obtained from the 2D grid (see text) by setting φ2 = 180° and φ2 = 300° for S0 and S1, respectively. We also show the vibrational-wave functions obtained from a 1D model. The different geometrical structures of the HCOOH molecule in each energy minimum are shown.
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