1. Department of Chemistry, Stanford University, Stanford, California 94305, United States
2. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, California 94025, United States
3. Dipartimento di Chimica Fisica, Università degli Studi di Palermo, 90128 Palermo, Italy
4. Koninklijk Instituut voor het Kunstpatrimonium-Institut Royal du Patrimoine Artistique (KIK-IRPA), 1000 Brussels, Belgium