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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ionization and Fragmentation of Some Chlorinated Compounds and Dibenzo-p-dioxin with an Intense Femtosecond Laser Pulse at 800 nm
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Ionization and Fragmentation of Some Chlorinated Compounds and Dibenzo-p-dioxin with an Intense Femtosecond Laser Pulse at 800 nm

机译：飞秒激光脉冲在800 nm处对某些氯化化合物和二苯并-对-二恶英的电离和裂解

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摘要

We detected parent and fragment ions from 14 chlorinated and a few fluorinated compounds as well as dibenzo-p-dioxin (dioxin) in intense laser fields. The irradiation pulse had an intensity from 1 * 10~(-13) to 1 * 10~(15) W cm~(-2), with a 130-fs pulse duration at a central wavelength of 800 nm. Irradiation at this intensity led to a singly ionized species and a small amount of atomic ions, indicating the onset of Coulomb explosions. We have previously reported finding a key factor in determining the parent and/or fragment ion formations of organic hydrocarbons with an intense femtosecond laser pulse [Harada, H.; et al. Chem. Phys. Lett. 2001, 342, 563-570]. This key factor is a requirement for parent ion predominance if the excitation laser wavelength and the absorption spectra of the target cation are in nonresonance, and vice versa. Use of this factor has been found to be effective for molecules other than hexachlorobutadiene. The threshold intensities I_(sat) at the infinity ionization rate were determined and are reasonably comparable to those of previously reported hydrocarbons.
机译：我们在强激光场中检测到了14种氯化物和一些氟化物以及二苯并-对-二恶英（二恶英）中的母体离子和碎片离子。辐照脉冲的强度为1 * 10〜（-13）至1 * 10〜（15）W cm〜（-2），在中心波长为800 nm时的脉冲持续时间为130-fs。以这种强度照射会导致单个电离的物种和少量的原子离子，表明库仑爆炸开始了。先前我们已经报道发现在用强飞秒激光脉冲确定有机烃的母体和/或碎片离子形成中发现关键因素[Harada，H .;等。化学物理来吧2001，342，563-570]。如果激发激光波长和目标阳离子的吸收光谱不共振，则此关键因素是母离子占优的要求，反之亦然。已经发现使用该因子对除六氯丁二烯以外的分子是有效的。确定了在无限电离速率下的阈值强度I_（sat），并且可以合理地与先前报道的烃类相当。

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