Journal of Chemical Physics, Vol.110, No.1, 209-219, 1999
State-to-state vibrational predissociation dynamics of the acetylene-HF complex
The vibrational predissociation of the acetylene-HF complex has been studied by probing the final state distributions of the photofragments, including the intermolecular scalar correlations. Results are presented for excitation of both the asymmetric C-H stretching vibration of the acetylene and the H-F stretch. In the latter case, the primary dissociation channel is V-R, resulting in highly rotationally excited HF produced in coincidence with ground vibrational state acetylene. Excitation of the asymmetric C-H stretch results in intramolecular V-V energy transfer to the C-C stretch excited state of the acetylene. The dissociation energy of the complex is determined to be 1088 cm(-1) +/- 2 cm(-1).
Keywords:PHOTOFRAGMENT ANGULAR-DISTRIBUTIONS;HYDROGEN-BONDED COMPLEXES;ENERGY-TRANSFER;VANDERWAALS MOLECULES;VECTOR CORRELATIONS;ELECTRIC-FIELDS;PENDULAR STATES;FLUORIDE DIMER;PHOTODISSOCIATION;SPECTRA