Vibrational excitation cross-section by positron impact: a wave-packet dynamics study

• Autor(a) principal: Luis Argel Poveda Calviño
• Data de Publicação: 2021
• Outros Autores: Márcio Teixeira do Nascimento Varella, José Rachid Mohallem
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFMG
• Texto Completo: https://doi.org/10.3390/atoms9030064; http://hdl.handle.net/1843/64304; https://orcid.org/0000-0002-9120-453X; https://orcid.org/0000-0002-5812-0342; https://orcid.org/0000-0002-4776-4417
• topic: Positron scattering; Vibrational cross-section; Wave-packet dynamics; Positron; Model potential; Wave-packet propagation; Positrons

The vibrational excitation cross-section of a diatomic molecule by positron impact is obtained using wave-packet propagation techniques. The dynamics study was carried on a two- dimensional potential energy surface, which couples a hydrogenlike harmonic oscillator to a positron via a spherically symmetric correlation polarization potential. The cross-section for the excitation of the first vibrational mode is in good agreement with previous reports. Our model suggests that a positron couples to the target vibration by responding instantly to an interaction potential, which depends on the target vibrational coordinate.