Laarmann T, Shchatsinin I, Stalmashonak A, Boyle M, Zhavoronkov N, Handt J, Schmidt R, Schulz C P, Hertel I V
Max Born Institute, Max-Born-Strasse 2a, D-12489 Berlin, Germany.
Phys Rev Lett. 2007 Feb 2;98(5):058302. doi: 10.1103/PhysRevLett.98.058302. Epub 2007 Feb 1.
Femtosecond laser pulses tailored with closed-loop, optimal control feedback were used to excite oscillations in C60 with large amplitude by coherent heating of nuclear motion. A characteristic pulse sequence results in significant enhancement of C2 evaporation, a typical energy loss channel of vibrationally hot C60. The separation between subsequent pulses in combination with complementary two-color pump-probe data and time-dependent density functional theory calculations give direct information on the multielectron excitation via the t(1g) resonance followed by efficient coupling to the radial symmetric a(g)(1) breathing mode.
利用闭环最优控制反馈定制的飞秒激光脉冲，通过核运动的相干加热来激发C60中的大幅度振荡。一种特征脉冲序列导致C2蒸发显著增强，C2蒸发是振动热C60的典型能量损失通道。后续脉冲之间的间隔，结合互补的双色泵浦 - 探测数据以及含时密度泛函理论计算，给出了关于通过t(1g)共振进行多电子激发以及随后与径向对称的a(g)(1)呼吸模式有效耦合的直接信息。
