Ahmed Zewail (Caltech, USA) 1999年度诺贝尔化学奖获得者 for his studies of the transition states of chemical reactions using femtosecond spectroscopy Receiving the award from the ki kholm, December 10. 19o0 ntp: /nobelprize.org/Ahmed Zewail (Caltech, USA) (Caltech, USA) 1999 年度诺贝尔化学奖获得者 "for his studies of the transition for his studies of the transition states of chemical reactions using states of chemical reactions using femtosecond femtosecond spectroscopy spectroscopy” http:// http://nobelprize nobelprize.org/