TY - JOUR A1 - Beck, Michael A1 - Stiel, H. A1 - Leupold, Dieter A1 - Winter, Bernd A1 - Pop, D. A1 - Vogt, U. A1 - Spitz, Christian T1 - Evaluation of the energetic position of the lowest excited singlet state of ß-carotene by NEXAFS and photoemission spectroscopy Y1 - 2001 ER -