Author Affiliations

William R. McGehee,^1,2,*,† Wenqi Zhu,^1,2 Daniel S. Barker,^1,3 Daron Westly,¹ Alexander Yulaev,^1,4 Nikolai Klimov,¹ Amit Agrawal,^1,2 Stephen Eckel,¹ Vladimir Aksyuk,¹ and Jabez J. McClelland¹

¹Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA

²Institute for Research in Electronics and Applied Physics and Maryland NanoCenter, University of Maryland, College Park, MD 20742, USA

³Joint Quantum Institute, University of Maryland, College Park, MD 20742, USA

⁴Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA

^†Present address: Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, CO 80305, USA

^*Corresponding author: william.mcgehee@nist.gov