ICFO-Institut de Ciencies Fotoniques, Av. Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain.
J Phys Chem A. 2012 Mar 22;116(11):2662-8. doi: 10.1021/jp207257j. Epub 2011 Nov 23.
We study ionization of molecules by an intense laser field over a broad wavelength regime, ranging from 0.8 to 1.5 μm experimentally and from 0.6 to 10 μm theoretically. A reaction microscope is combined with an optical parametric amplifier to achieve ionization yields in the near-infrared wavelength regime. Calculations are done using the strong-field S-matrix theory and agreement is found between experiment and theory, showing that ionization of many molecules is suppressed compared to the ionization of atoms with identical ionization potentials at near-infrared wavelengths at around 0.8 μm, but not at longest wavelengths (10 μm). This is due to interference effects in the electron emission that are effective at low photoelectron energies but tend to average out at higher energies. We observe the transition between suppression and nonsuppression of molecular ionization in the near-infrared wavelength regime (1-5 μm).
我们研究了强激光场对分子的电离作用，波长范围很广，实验范围从 0.8 到 1.5μm，理论范围从 0.6 到 10μm。我们将反应显微镜与光学参量放大器相结合，在近红外波长范围内实现了离子化产率。我们使用强场 S 矩阵理论进行了计算，并在实验和理论之间找到了一致性，表明与具有相同电离势的原子相比，许多分子的电离在近红外波长（约 0.8μm）处被抑制，但在最长波长（10μm）处则不会被抑制。这是由于在低光电能时有效的电子发射中的干涉效应，但在高能时往往会平均化。我们观察到在近红外波长范围（1-5μm）内分子电离的抑制和非抑制之间的转变。
