Estudo Geralhttps://estudogeral.sib.uc.ptThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Thu, 06 Aug 2020 10:58:05 GMT2020-08-06T10:58:05Z5041Integral and differential elastic collision cross-sections for low-energy Ar+ ions with neutral Ar atomshttp://hdl.handle.net/10316/4352Title: Integral and differential elastic collision cross-sections for low-energy Ar+ ions with neutral Ar atoms
Authors: Barata, J. A. S.
Abstract: Integral and differential elastic collision cross-sections for Ar+ ions with neutral Ar atoms are calculated using modified Tang and Toennies ion-atom interaction potential models, TTIA and TTIA-wb, to describe experimental spectroscopic data for the Ar2+ molecular ion, and the phase shifts are calculated by the JWKB approximation. Results are presented for center-of-mass energies in the 1 meV to 10 eV range. In our calculations, the effects of the spin-orbit interaction are included through a semi-empirical model. The results obtained agree with the scarce data available in the scientific literature.
Mon, 01 Jan 2007 00:00:00 GMThttp://hdl.handle.net/10316/43522007-01-01T00:00:00ZCalculation of elastic integral and differential collision cross-sections for low energy Ne+, Ar+, Kr+ and Xe+ ions with neutral He atomshttp://hdl.handle.net/10316/4439Title: Calculation of elastic integral and differential collision cross-sections for low energy Ne+, Ar+, Kr+ and Xe+ ions with neutral He atoms
Authors: Barata, J. A. S.; Conde, C. A. N.
Thu, 01 Jan 2004 00:00:00 GMThttp://hdl.handle.net/10316/44392004-01-01T00:00:00ZMonte Carlo calculations of drift velocities and diffusion coefficients of Ar+ ions in heliumhttp://hdl.handle.net/10316/4353Title: Monte Carlo calculations of drift velocities and diffusion coefficients of Ar+ ions in helium
Authors: Barata, J. A. S.; Conde, C. A. N.
Abstract: Results are presented for the calculated drift velocities and diffusion coefficients for Ar+ ions in helium at atmospheric pressure, temperature T=300 K and for reduced electric fields E/N from about 1 Td up to about 150 Td, using Monte Carlo techniques. The drift velocities range from 5.94×103 to 559.0×103 cm s-1 for the Ar+ ions in the ground state 2P3/2 and from 5.85×103 to 545.0×103 cm s-1 for the Ar+ ions in the metastable excited state 2P1/2. These values are in good agreement (within about 5%) with the few experimental values available. The mobilities and diffusion coefficients for atomic Ar+ ions in helium gas show no significant dependence on the spin state of the ion.
Mon, 01 Jan 2007 00:00:00 GMThttp://hdl.handle.net/10316/43532007-01-01T00:00:00ZMonte Carlo calculations of drift velocities of Ne+ ions in heliumhttp://hdl.handle.net/10316/4441Title: Monte Carlo calculations of drift velocities of Ne+ ions in helium
Authors: Barata, J. A. S.; Conde, C. A. N.
Thu, 01 Jan 2004 00:00:00 GMThttp://hdl.handle.net/10316/44412004-01-01T00:00:00Z