About the Authors

Niels J. Christensen

Affiliation Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark

Kasper P. Kepp

kpj@kemi.dtu.dk

Affiliation Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NJC KPK. Performed the experiments: NJC. Analyzed the data: NJC KPK. Wrote the paper: NJC KPK.