Control and identification of strong field dissociative channels in CO2+?> via molecular alignment
Control and identification of strong field dissociative channels in CO2+?> via molecular alignment
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DOI：
10.1088/0953-4075/47/12/124025
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发表时间：
2014-06
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影响因子：
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通讯作者：
M. Oppermann;S. Weber;F. Morales;M. Richter;S. Patchkovskii;A. Csehi;Á. Vibók;M. Ivanov;O. Smirnova;J. Marangos
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文献类型：
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作者：
M. Oppermann;S. Weber;F. Morales;M. Richter;S. Patchkovskii;A. Csehi;Á. Vibók;M. Ivanov;O. Smirnova;J. Marangos
CO2+的解离激发？>在分子框架中作为探测激光强度的函数，椭圆率和偏振相对于分子键在800 nm和1350 nm的激光波长进行了研究。这允许识别的主要激发途径，包括隧道电离从HOMO-2其次是一个平行的偶极跃迁从第二激发态B的预解离，第三激发态C。结果表明，重碰撞激励的作用可以忽略不计。利用激光诱导脉冲排列，离子态B和C在800 nm和1350 nm处的强场诱导耦合可以由激光偏振控制。这导致抑制的碎片产率高达70%时，激光偏振垂直于分子轴相比，平行偏振。我们已经进行了各种电离通道的CO2的模拟。我们的模拟反映了实验结果，并表明解离的CO2+？>是由从更深的分子轨道HOMO-1，HOMO-2，HOMO-3的隧穿，然后由激光驱动的离子中的空穴动力学引起的。
The dissociative excitation of CO2+?> was studied in the molecular frame as a function of probe laser intensity, ellipticity and polarization with respect to the molecular bond at laser wavelengths of 800 nm and 1350 nm. This allowed the identification of the main excitation pathway consisting of tunnel ionization from HOMO-2 followed by a parallel dipole transition from the second excited state B to the predissociating, third excited state C. Recollision excitation was shown to play a negligible role. Using laser induced impulsive alignment, the strong field induced coupling at 800 nm and 1350 nm of the ionic states B and C could thus be controlled by the laser polarization. This leads to a suppression of the fragmentation yield of up to 70% when the laser polarization was perpendicular to the molecular axis compared to parallel polarization. We have performed simulations of various ionization channels of CO2. Our simulations reflect the experimental findings and show that dissociation of CO2+?> is induced by tunnelling from deeper molecular orbitals HOMO-1, HOMO-2, HOMO-3, followed by laser driven hole dynamics in the ion.