Experimental evidence for a virtual state in a cold collision: Electrons and carbon dioxide
Abstract
Experimental data are presented for the scattering of cold electrons by CO2, for both integral and backward scattering, down to energies of a few meV with an energy resolution of 0.95-1.5 meV (full width at half maximum) in the electron beam. The experimental data show evidence for the phenomenon of virtual-state scattering, a subject of extensive theoretical study. The measured scattering cross sections rise rapidly at low energy, to a limiting value in integral scattering in excess of 120 Å2. In addition, analysis shows that scattering is s-wave dominated and that the s-wave scattering length is negative. All features are characteristic of virtual state scattering.
- Publication:
-
Physical Review A
- Pub Date:
- August 2001
- DOI:
- 10.1103/PhysRevA.64.022708
- Bibcode:
- 2001PhRvA..64b2708F
- Keywords:
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- 34.80.-i;
- Electron scattering