Interaction of 18-keV O⁻ ions with Al₂O₃ nanocapillaries

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Guangzhi Sun, Ximeng Chen, Jun Wang, Yifeng Chen, Junkui Xu, Chunlin Zhou, Jianxiong Shao, Ying Cui, Baowei Ding, Yongzhi Yin, Xin'an Wang, Fengjun Lou, Xueyang Lv, Xiyu Qiu, Juanjuan Jia, Lin Chen, Fayuan Xi, Zichun Chen, Lanting Li, and Zhaoyuan Liu
School of Nuclear Science and Technology, Lanzhou University, Gansu 730000, China

Received 12 February 2009; published 5 May 2009

Thetransmission of 18-keV O⁻ ions through Al₂O₃ nanocapillaries with 50nm in diameter and 12 µm in length is studied inthis work. By measuring angular distribution of transmitted particles whencapillaries were tilted with respect to incident ion beam, twopeaks were observed. It is distinguished that one of themis composed by direct transmitted ions and another one iscomposed by scattered ions. A phenomenon referred to as guidingeffect, as found for highly charged ions and low-energy electrons,was observed. When negative ions (18-keV O⁻) are transmitted throughnanocapillaries, most of them were ionized to neutral atoms andeven positive ions. The intensity of transmitted particles (O⁻, O⁰,and O⁺) decreased when the tilt angle increased. In transmittedparticles, the fraction of O⁻ declined but that of O⁰and O⁺ ions grew when the tilt angle grew. Bothelastic collision and electrostatic scattering were found in scattered ions.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.79.052902
DOI:	10.1103/PhysRevA.79.052902
PACS:	79.20.Rf; 34.35.+a; 34.50.Fa; 68.49.Sf 79.20.Rf Atomic, molecular and ion beam impact and interactions with surfaces 34.35.+a Interactions of atoms and molecules with surfaces 34.50.Fa Electronic excitation and ionization of atoms 68.49.Sf Ion scattering from surfaces YEAR: 2009
KEYWORDS:	alumina, channelling, ion beam effects, ion-surface impact, negative ions, oxygen

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