D. A. Macaluso^*

• Department of Physics and Astronomy, University of Montana, Missoula, Montana 59812, USA

A. Aguilar^†, A. L. D. Kilcoyne, and E. C. Red^‡

• The Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

R. C. Bilodeau^§

• Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008-5252, USA and The Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

R. A. Phaneuf

• Department of Physics, University of Nevada, Reno, Nevada 89557-0220, USA

N. C. Sterling

• Department of Physics, University of West Georgia, Carrollton, Georgia 30118, USA

B. M. McLaughlin^∥

• Centre for Theoretical Atomic, Molecular and Optical Physics (CTAMOP), School of Mathematics and Physics, The David Bates Building, 7 College Park, Queen's University of Belfast, Belfast BT7 1NN, United Kingdom and Institute for Theoretical Atomic and Molecular Physics (ITAMP), Harvard Smithsonian Center for Astrophysics, 60 Garden Street, MS-14, Cambridge, Massachusetts 02138, USA

• ^*david.macaluso@umontana.edu
• ^†Present address: ReVera Incorporated, 3090 Oakmead Village Drive, Santa Clara, California 95051, USA.
• ^‡Present address: Department of Physics, Morehouse College, Atlanta, Georgia 30314, USA.
• ^§Present address: Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA.
• ^∥bmclaughlin899@btinternet.com