1. National Institute of Metrology (Thailand), 3/4-5 Moo 3, Klong 5, Pathum Thani, Thailand 12120
2. Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstaetter-Str. 11, 12489 Berlin, Germany
3. Department of Chemistry, Humboldt Universität, Brook-Taylor 2, 12489 Berlin, Germany