Staudte A, Pavicić D, Chelkowski S, Zeidler D, Meckel M, Niikura H, Schöffler M, Schössler S, Ulrich B, Rajeev P P, Weber Th, Jahnke T, Villeneuve D M, Bandrauk A D, Cocke C L, Corkum P B, Dörner R
Institut für Kernphysik, J.W. Goethe Universität, D-60486 Frankfurt/Main, Germany.
Phys Rev Lett. 2007 Feb 16;98(7):073003. doi: 10.1103/PhysRevLett.98.073003. Epub 2007 Feb 14.
Using H2+ and D2+, we observe two-surface population dynamics by measuring the kinetic energy of the correlated ions that are created when H2+ (D2+) ionize in short (40-140 fs) and intense (10(14) W/cm2) infrared laser pulses. Experimentally, we find a modulation of the kinetic energy spectrum of the correlated fragments. The spectral progression arises from a hitherto unexpected spatial modulation on the excited state population, revealed by Coulomb explosion. By solving the two-level time-dependent Schrödinger equation, we show that an interference between the net-two-photon and the one-photon transition creates localized electrons which subsequently ionize.
利用H2+和D2+，我们通过测量当H2+（D2+）在短（40 - 140飞秒）且强（10^14瓦/平方厘米）的红外激光脉冲中电离时产生的关联离子的动能，来观测双表面布居动力学。在实验中，我们发现了关联碎片动能谱的调制现象。这种光谱进展源于库仑爆炸所揭示的、迄今未曾预料到的激发态布居的空间调制。通过求解含时二级薛定谔方程，我们表明净双光子跃迁与单光子跃迁之间的干涉产生了局域化电子，这些电子随后发生电离。
