Low-energy electron capture by N{sup 2+} ions from atomic hydrogen using merged beams
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372 (United States)
Using the merged-beams technique, independent, absolute, total electron-capture cross sections have been measured for the N{sup 2+}+H (or D) system in the collision energy range 0.1{endash}4500 eV/amu. For collision energies less than 200 eV/amu, the data are in reasonable accord with recent fully quantal calculations of Herrero {ital et al.} [J. Phys. B {bold 28}, 711 (1995)], except that the experiment provides no evidence for the existence of a peak in the cross section at 0.25 eV/amu. Additional structure between 10 and 100 eV/amu, as predicted by Bienstock {ital et al.} [Phys. Rev. A {bold 33}, 2078 (1986)], is not observed either. A comparison is also made with other measurements, which make use of a hydrogen furnace [Phaneuf {ital et al.}, Phys. Rev. A {bold 17}, 534 (1978); Seim {ital et al.}, J. Phys. B {bold 14}, 3475 (1981); Wilkie {ital et al.}, J. Phys. B {bold 18}, 479 (1985)]. Above 2000 eV/amu the agreement is excellent. However, between 200 and 2000 eV/amu the present results are some 30{percent} below the previously published experimental and theoretical cross sections, and a local maximum is found near 200 eV/amu, instead of 360 eV/amu. A possible explanation for this discrepancy is suggested. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 496690
- Journal Information:
- Physical Review A, Vol. 55, Issue 5; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Molecular treatment of electron capture in atomic collisions in the meV- to keV-energy regime: Collisions of C sup 5+ ions with H atoms and the effect of core electrons
Absolute cross sections with polarization effects in Ne{sup {asterisk}}(2p{sup 5}3p)+He collisions: A detailed comparison between theory and experiment