1. Institut für Physik and IRIS Adlershof Humboldt‐Universität zu Berlin D‐12489 Berlin Germany
2. Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH D‐12489 Berlin Germany
3. Berlin Joint EPR Lab Fachbereich Physik Freie Universität Berlin D‐14195 Berlin Germany
4. School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics Georgia Institute of Technology Atlanta GA 30332‐0400 USA
5. Department of Industrial and Engineering Chemistry Institute of Chemical Technology—Indian Oil Odisha Campus IIT Kharagpur Extension Center Bhubaneswar Odisha 751013 India