Attosecond chirp-encoded dynamics of light nuclei
Attosecond chirp-encoded dynamics of light nuclei
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DOI：
10.1088/0953-4075/42/13/134002
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发表时间：
2009-07-14
影响因子：
1.6
通讯作者：
Salieres, P.
中科院分区：
文献类型：
--
作者：
Haessler, S.;Boutu, W.;Salieres, P.
我们研究了分子电离后高次谐波辐射的光谱相位，作为探测超快核动力学的观测量。使用强场近似理论，包括核动力学，我们涉及的谐波相位的重叠积分的核波函数的初始中性分子和分子离子阿秒探测延迟后的相位。实验测量了D-2和H-2分子高次谐波辐射的群延迟，验证了谐波频率与阿秒延迟之间的关系。理论计算的H-2和D-2的谐波相位相差很小，这与我们的实验结果是一致的。
We study the spectral phase of high-order harmonic emission as an observable for probing ultrafast nuclear dynamics after the ionization of a molecule. Using a strong-field approximation theory that includes nuclear dynamics, we relate the harmonic phase to the phase of the overlap integral of the nuclear wavefunctions of the initial neutral molecule and the molecular ion after an attosecond probe delay. We determine experimentally the group delay of the high harmonic emission from D-2 and H-2 molecules, which allows us to verify the relation between harmonic frequency and the attosecond delay. The small difference in the harmonic phase between H-2 and D-2 calculated theoretically is consistent with our experimental results.