title: Development of an ion beam alignment system for real-time scanning tunneling microscope observation of dopant-ion irradiation.
abstract: An ion beam alignment system has been developed in order to realize real-time scanning tunneling microscope (STM) observation of "dopant-ion" irradiation that has been difficult due to the low emission intensity of the liquid-metal-ion-source (LMIS) containing dopant atoms. The alignment system is installed in our original ion gun and STM combined system (IG/STM) which is used for in situ STM observation during ion irradiation. By using an absorbed electron image unit and a dummy sample, ion beam alignment operation is drastically simplified and accurized. We demonstrate that sequential STM images during phosphorus-ion irradiation are successfully obtained for sample surfaces of Si(111)-7x7 at room temperature and a high temperature of 500 degrees C. The LMIS-IG/STM equipped with the developed ion beam alignment system would be a powerful tool for microscopic investigation of the dynamic processes of ion irradiation.
authors.affiliation: Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan.
authors.forename: Takefumi
authors.initials: T
authors.lastname: Kamioka
authors.forename: Kou
authors.initials: K
authors.lastname: Sato
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Kazama
authors.forename: Takanobu
authors.initials: T
authors.lastname: Watanabe
authors.forename: Iwao
authors.initials: I
authors.lastname: Ohdomari