FEMTOSECOND CLOCKING OF THE CHEMICAL-BOND
FEMTOSECOND CLOCKING OF THE CHEMICAL-BOND
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DOI：
10.1126/science.241.4870.1200
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发表时间：
1988-09-02
期刊：
影响因子：
56.9
通讯作者：
ZEWAIL, AH
中科院分区：
文献类型：
--
作者：
ROSKER, MJ;DANTUS, M;ZEWAIL, AH
当一个化学键在直接解离反应中断裂时，这个过程是如此之快，以至于通常被认为是瞬时的，因此无法测量。然而，在光子被吸收后，这种键确实会持续10-13秒的时间。飞秒（10-15秒）激光技术可以用来直接记录这一过程，它描述了化学键的动力学。测量了元素反应中化学键断裂所需的时间，并得到了控制碎片分离的电位的特征斥力长度。
When a chemical bond is broken in a direct dissociation reaction, the process is so rapid that it has generally been considered instantaneous and thus unmeasurable. However, the bond does persist for times on the order of 10-13seconds after the photon has been absorbed. Femtosecond (10-15second) laser techniques can be used to directly clock this process, which describes the dynamics of the chemical bond. The time required to break the chemical bond in an elementary reaction has been measured and the characteristic repulsion length for the potential governing fragment separation has been obtained.