【摘要】 利用飞行时间质谱仪和飞秒激光放大系统 ,对分子在飞秒强激光脉冲作用下的场致电离和库仑爆炸过程进行了研究。在飞行时间质谱中 ,原子离子的谱峰分裂标志着这些原子离子来源于高价母体离子的库仑爆炸。通过对不同结构的分子在飞秒强激光下的库仑爆炸研究 ,发现这些分子离子的爆炸是一个协同过程。母体离子的角分布呈现了高度的各向同性 ,而原子离子则呈现了高度的各向异性分布。这说明分子在飞秒激光场中发生了空间准直和重新定位。更多还原

【Abstract】 The Field ionization and Coulomb explosion of small molecules in intense femtosecond laser pulses was studied by using the time of flight mass spectrometer. In the obtained mass spectra of molecules, the peak splitting of atomic ions is a hallmark of Coulomb explosion process indicating their coming from the dissociation of highly charged parent molecule ion. The Coulomb explosion is found to be concerted process through comparing different structured molecules. The angular distribution of parent molecule ion is highly isotropic while that of the atomic ion is anisotropic. This indicates that the spatial alignment and reorientation of molecule in laser field has occurred.更多还原