Direct Test of Laser Tunneling with Electron Momentum Imaging
Direct Test of Laser Tunneling with Electron Momentum Imaging
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DOI：
10.1103/physrevlett.105.133002
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发表时间：
2010-09-24
影响因子：
8.6
通讯作者：
Corkum, P. B.
中科院分区：
文献类型：
--
作者：
Arissian, L.;Smeenk, C.;Corkum, P. B.
在红外场中，稀有气体原子的多光子电离常被用来描述。我们通过测量圆偏振光脉冲沿着k方向的未扰动动量分布来检验隧穿近似及其非绝热扩展。我们发现大量的，但不是全部，我们的结果和模型的预测之间的协议。结果表明，k方向动量分布为高斯分布，其宽度随电场强度的平方根增大而增大。然而，宽度太大了15%，当我们接近近似的预期极限时，我们没有发现非绝热效应的证据。
Tunneling is often used to describe multiphoton ionization of rare gas atoms in infrared fields. We test the tunneling approximation and its nonadiabatic extension by measuring the unperturbed momentum distribution along the k direction of a circularly polarized light pulse. We find substantial, but not total, agreement between our results and the predictions of the model. As predicted, the k direction momentum distribution is Gaussian and its width increases with the square root of electric field strength. However, the width is 15% too large and we find no evidence of nonadiabatic effects as we approach the expected limits of the approximation.