The dominant “heating” mode: bending excitation of water molecules by low-energy positron impact
The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics - Tập 33 - Trang 221-228 - 2005
Tóm tắt
We report a quantum dynamical treatment of the vibrational excitation
of the bending mode of water molecules by collision with low energy positrons
in the energy regions close to threshold openings.
The exact vibrationally coupled-channel equations derived for the
total e+-H2O system are solved in a Body-Fixed-Vibrational-Coupled-Channels (BF-VCC) reference frame, using a single-center expansion of the total wavefunction and of the
interaction potential. The vibrationally inelastic cross-sections for
transitions from the ground to the lowest excited state of the bending mode clearly show
the bending excitation channel to be the dominant inelastic process at
low collision energies. Comparisons with our earlier calculations
for the other modes and for the excited processes induced by
electron impact are also presented and analysed.