Near threshold rotational excitation of molecular ions by electron-impact

Details Near threshold rotational excitation of molecular ions by electron-impact Near threshold rotational excitation of molecular ions by electron-impact

2006-08-07

arxiv.org/abs/physics/0608078v1

Physics

Atomic Physics

3 figures, a5 pages

Scientific paper

10.1088/0953-4075/39/20/023

New cross sections for the rotational excitation of H$_3^+$ by electrons are calculated {\it ab initio} at low impact energies. The validity of the adiabatic-nuclei-rotation (ANR) approximation, combined with $R$-matrix wavefunctions, is assessed by comparison with rovibrational quantum defect theory calculations based on the treatment of Kokoouline and Greene ({\it Phys. Rev. A} {\bf 68} 012703 2003). Pure ANR excitation cross sections are shown to be accurate down to threshold, except in the presence of large oscillating Rydberg resonances. These resonances occur for transitions with $\Delta J=1$ and are caused by closed channel effects. A simple analytic formula is derived for averaging the rotational probabilities over such resonances in a 3-channel problem. In accord with the Wigner law for an attractive Coulomb field, rotational excitation cross sections are shown to be large and finite at threshold, with a significant but moderate contribution from closed channels.

Affiliated with

Also associated with

No associations

Rating

Near threshold rotational excitation of molecular ions by electron-impact does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Near threshold rotational excitation of molecular ions by electron-impact, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near threshold rotational excitation of molecular ions by electron-impact will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-247798