A single-atom sharp iridium tip as an emitter of gas field ion sources.
We report a reliable method for preparing a pure Ir single-atom tip by thermal treatment in oxygen. The atomic structure of the tip apex and its ion emission characteristics are investigated with field ion microscopy. We have shown that the Ir single-atom tip can be a good field ion emitter, capable of emitting a variety of gas ion beams, such as He+, H2+, N2+, and O2+, with high brightness and stability. In addition, this tip can easily be maintained and regenerated in vacuum, ensuring it has sufficient lifetime for practical applications.
Kuo
Hong-Shi
HS
Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, Republic of China.
Hwang
Ing-Shouh
IS
Fu
Tsu-Yi
TY
Hwang
Ying-Siang
YS
Lu
Yi-Hsien
YH
Lin
Chun-Yueh
CY
Hou
Jin-Long
JL
Tsong
Tien T
TT