Ionization and Fragmentation of Some Chlorinated Compounds and Dibenzo-p-dioxin with an Intense Femtosecond Laser Pulse at 800 nm
Ionization and Fragmentation of Some Chlorinated Compounds and Dibenzo-p-dioxin with an Intense Femtosecond Laser Pulse at 800 nm
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DOI：
10.1021/jp022626c
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发表时间：
2003-08
影响因子：
2.9
通讯作者：
H. Harada;Michinori Tanaka;M. Murakami;S. Shimizu;T. Yatsuhashi;N. Nakashima;S. Sakabe;Y. Izawa;S. Tojo;T. Majima
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文献类型：
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作者：
H. Harada;Michinori Tanaka;M. Murakami;S. Shimizu;T. Yatsuhashi;N. Nakashima;S. Sakabe;Y. Izawa;S. Tojo;T. Majima
我们在强激光场下检测了14种氯代化合物和少量氟化物中的母离子和碎片离子，以及二苯并对二恶英(Dioxin)。辐照脉冲强度为1×1013~1×1015W cm-2，中心波长为800 nm，脉宽为130ps。在这种强度下的辐照导致了单一的电离物种和少量的原子离子，表明库仑爆炸的开始。我们以前曾报道过在用强烈的飞秒激光脉冲确定有机碳氢化合物的母体和/或碎片离子形成过程中发现一个关键因素[Harada，H.；et al.化学。太棒了。让我们来吧。2001,342,563−570]。如果激发激光波长和靶阳离子的吸收光谱是非共振的，则这一关键因素是母离子优势的必要条件，反之亦然。该因子的使用已被发现对六氯丁二烯以外的分子有效。测定了无限大电离速率下的阈值强度ISAT，并给出了计算结果。
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 × 1013 to 1 × 1015 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 Isat at the infinity ionization rate were determined and ar...