用激光代替解剖刀,眼外科医生可施行更精密手术。现在,激光化学家已把他们的外科技术推广到打断化学键和控制化学反应。斯坦福大学的R.N.Zare和他的同事已证明,他们能使水分子激发并在特定部位断裂。开始时,用红外激光使水分子的一个键诱发振动,然后再用其它氢原子轰击,将这个分子的氢原子打掉。据报导,另一小组介绍了用激光制作左旋或右旋镜象分子的理论基础。多伦多大学的P.Erumer说,“相干化学”技术对药物研制可能有重要意义。许多化合物都以两种镜象形式存在,但大多数情况下,只是其中一种有治疗作用。以色列魏兹曼科学研究所的Brumer和M.Shapire提出,激光脉冲序列能把大分子分 Using a laser instead of a scalpel, eye surgeons can perform more sophisticated surgery. Now, laser chemists have extended their surgical techniques to breaking chemical bonds and controlling chemical reactions. R.N. Zare of Stanford University and his colleagues have shown that they can excite water molecules and break at specific sites. Initially, an infrared laser was used to vibrate a bond of water molecules and then bombarded with other hydrogen atoms to knock down the hydrogen atoms of the molecule. It has been reported that another group introduced the theoretical basis of using laser to make left-handed or right-handed mirror image molecules. P. Erumer of the University of Toronto said that “coherent chemistry” may have important implications for drug development. Many compounds exist in two mirror images, but in most cases, only one of them has a therapeutic effect. Brumer and M. Shapire of the Weizmann Institute of Science in Israel proposed that laser pulse sequences can convert macromolecules