Probing ultrafast dynamics with attosecond transient absorption
Probing ultrafast dynamics with attosecond transient absorption
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DOI：
10.1016/j.cplett.2014.12.048
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发表时间：
2015-03-16
影响因子：
2.8
通讯作者：
Leone, Stephen R.
中科院分区：
文献类型：
--
作者：
Beck, Annelise R.;Neumark, Daniel M.;Leone, Stephen R.
孤立的Attosend脉冲的宽带带宽同时激发了大量状态，并且可以通过特殊的时间分辨率来监测相应的吸收特征。使用分离的Attsond脉冲在气体中进行的新型瞬时吸收实验是在两个方案中进行的，其中一个脉冲与近红外（NIR）脉冲及时重叠，其中NIR脉冲遵循Attosecond脉冲。在后一种方案中，attosen脉冲首先与样品相互作用，然后观察到的吸收特征通过NIR脉冲修饰，NIR脉冲在Attosecond脉冲通过后与样品相互作用。在这些实验中，与常规的瞬态吸收光谱相比，它们似乎是违反直觉的，弱的脉冲会诱导培养基的极化，然后被时删除的NIR脉冲扰动。最近的测量表明，可以在此制度中提取的各种信息。 （c）2014 Elsevier B.V.保留所有权利。
The broad bandwidth of an isolated attosecond pulse excites a vast number of states simultaneously, and the corresponding absorption features can be monitored with exceptional temporal resolution. Novel transient absorption experiments in gases using isolated attosecond pulses are performed in two regimes, one in which the attosecond pulse is overlapped in time with a near-infrared (NIR) pulse and one in which the NIR pulse follows the attosecond pulse. In the latter regime, the attosecond pulse first interacts with a sample, then the observed absorption features are modified by a NIR pulse, which interacts with the sample well after the attosecond pulse has passed. In these experiments, which seem counterintuitive when compared to conventional transient absorption spectroscopy, the weak attosecond pulse induces a polarization of the medium, which is then perturbed by the time-delayed NIR pulse. Recent measurements demonstrate the rich variety of information that can be extracted in this regime. (C) 2014 Elsevier B.V. All rights reserved.