强脉冲钛宝石光解离的阿秒特征
Attosecond signatures in photodissociation by an intense Ti:Sapphire pulse
摘要：
在我们的模型中，电子动力学由两态近似描述。这可能是一个粗略的近似，因为它忽略了通过激发电子态和电离通道的耦合。然而，在高强度（相当于库仑力的激光场）和长波长（光子能量远低于电离势）下，解离过程通过涉及最低电子态的绝热极化发生。对于所讨论的实验，强度高于10 x14 W cm-2，光子能量为1.5eV，这种方法是合理的。更有争议的是忽略了脉冲期间的旋转加热（即分子重新排列）。然而，这个过程本质上是一个内部弛豫，对于50 fs脉冲，它的影响很小。为了计算离解谱，我们应用了分子光电离的离散化方法4）求解对偶组态和动量空间中的量子方程。技术细节在Peng等人的论文中进行了讨论。
英文摘要：
In our model the electron dynamics are described by a two-state approximation. This might appear a rough approximation since it neglects coupling through excited electronic states and ionization channels. However at high intensity (laser fields equivalent to the Coulomb force) and long wavelength (photon energy much lower than the ionization potential) the dissociation process occurs by adiabatic polarization involving the lowest electronic states. For the experiment in question, with intensities above 10x14 W cm-2 and photon energies of 1.5eV, such an approach is well justified. More contentious is the neglect of rotational heating (that is molecular realignment) during the pulse. However, this process is essentially an internal relaxation and for a 50fs pulse it has a small effect. To calculate the dissociation spectrum, we have applied discretization methods developed for photoionization of molecules4) to solve the quantum equations in a dual configuration and momentum space. Technical details are discussed in the paper by Peng et al.
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