Event
Seminar: Ultrabright ions from ultracold atoms
Friday, February 6, 2015
9:30 a.m.-10:30 a.m.
A.V. Williams, Room 1146
Martha Heil
301 405 0876
mjheil@umd.edu
http://www.nanocenter.umd.edu/events/
New types of ions for focused beam instrument allows new imaging and ion transport study
Friday, Feb. 6.
9:30-10:30 a.m.
A.V. Williams, Room 1146
Jabez J. McClelland
Center for Nanoscale Science and Technology
National Institute of Standards and Technology, Gaithersburg, MD
ABSTRACT: Utilizing the ultracold temperatures achievable with laser cooling, we have realized a source of ions that not only has very high brightness, but also provides a wide choice of ionic species and a narrow energy spread. This source allows the creation of focused ion beams of new species such as alkalis and alkaline earths with nanometer resolution and picoampere currents, opening new opportunities for nanoscale imaging, material modification and ion implantation. For our first realization, we have constructed a source based on photoionization of a Li magneto-optical trap and mated this source with a conventional FIB column. This arrangement has enabled us to produce a focused Li+ beam with energy between 500 eV and 6 keV, current from 1 pA to 15 pA, and focal spot size as small as 27 nm. I will discuss applications of this focused ion beam, both as an imaging tool and as a potential enabler of nanoscale ion transport studies.
BIOGRAPHY: Jabez McClelland is the Group Leader of the CNST Electron Physics Group. He received a B.A. in Physics and Music from Wesleyan University, and M.A. and Ph.D. degrees in Physics from the University of Texas at Austin. During his graduate studies he spent a year as a Fulbright Fellow at the Freie Universität Berlin. Jabez came to NIST as a postdoctoral research associate in the Electron Physics Group, where he subsequently served as a research physicist, and most recently as the Group Leader. Jabez’s research at NIST has covered a number of topics ranging from spin-polarized low-energy electron scattering from laser excited atoms, to laser focused atomic deposition, metastable-atom lithography, and deterministic single-atom sources. He has over 90 publications, including several in high-profile journals such as Science and Physical Review Letters. He is a frequent invited speaker at international meetings, and is considered one of the world experts on atom optics. Jabez holds four patents, is a Fellow of the American Physical Society and the Optical Society of America, has received the Sigma Xi Award for Excellence in Science, and has been awarded both Silver and Gold Medals from the Department of Commerce. He currently leads projects on focused ion beam sources based on magneto-optically trapped atoms, laser cooling of novel atomic species, and atom-based metrology.
