Vibrational Excitation Cross-Section by Positron Impact: A Wave-Packet Dynamics Study

Atoms

Luis A. Poveda¹  José R. Mohallem²  Marcio T. do N. Varella³ 

[1] Departamento de Física, Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte 30421-169, MG, Brazil;Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte 30123-970, MG, Brazil;Intituto de Fısica, Universidade de São Paulo, São Paulo 05315-970, SP, Brazil;

关键词: positron;    model potential;    wave-packet propagation;    vibrational cross-section;   

DOI  :  10.3390/atoms9030064

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown