title: Single atom spectroscopy: Decreased scattering delocalization at high energy losses, effects of atomic movement and X-ray fluorescence yield.
abstract: Single atom localization and identification is crucial in understanding effects which depend on the specific local environment of atoms. In advanced nanometer scale materials, the characteristics of individual atoms may play an important role. Here, we describe spectroscopic experiments (electron energy loss spectroscopy, EELS, and Energy Dispersed X-ray spectroscopy, EDX) using a low voltage transmission electron microscope designed towards single atom analysis. For EELS, we discuss the advantages of using lower primary electron energy (30 keV and 60 keV) and higher energy losses (above 800 eV). The effect of atomic movement is considered. Finally, we discuss the possibility of using atomically resolved EELS and EDX data to measure the fluorescence yield for X-ray emission.
authors.affiliation: Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan. Electronic address: luiz.galvao-tizei@u-psud.fr.
authors.forename: Luiz H G
authors.initials: LHG
authors.lastname: Tizei
authors.affiliation: Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan.
authors.forename: Yoko
authors.initials: Y
authors.lastname: Iizumi
authors.affiliation: Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan.
authors.forename: Toshiya
authors.initials: T
authors.lastname: Okazaki
authors.affiliation: Department of Chemistry, Nagoya University, Nagoya 468-8602, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Nakanishi
authors.affiliation: Department of Chemistry, Nagoya University, Nagoya 468-8602, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Kitaura
authors.affiliation: Department of Chemistry, Nagoya University, Nagoya 468-8602, Japan.
authors.forename: Hisanori
authors.initials: H
authors.lastname: Shinohara
authors.affiliation: Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan.
authors.forename: Kazu
authors.initials: K
authors.lastname: Suenaga
keywords: EDX; EELS; STEM; Single atoms