He, LixinLan, PengfeiLe, Anh-ThuWang, BaoningWang, BinchengZhu, XiaosongLu, PeixiangLin, C. D.2019-04-172019-04-172018-10-15http://hdl.handle.net/2097/39542Citation: He, L., Lan, P., Le, A.-T., Wang, B., Wang, B., Zhu, X., … Lin, C. D. (2018). Real-Time Observation of Molecular Spinning with Angular High-Harmonic Spectroscopy. Physical Review Letters, 121(16), 163201. https://doi.org/10.1103/PhysRevLett.121.163201We demonstrate an angular high-harmonic spectroscopy method to probe the spinning dynamics of a molecular rotation wave packet in real time. With the excitation of two time-delayed, polarization-skewed pump pulses, the molecular ensemble is impulsively kicked to rotate unidirectionally, which is subsequently irradiated by another delayed probe pulse for high-order harmonic generation (HHG). The spatiotemporal evolution of the molecular rotation wave packet is visualized from the time-dependent angular distributions of the HHG yields and frequency shift measured at various polarization directions and time delays of the probe pulse. The observed frequency shift in HHG is demonstrated to arise from the nonadiabatic effect induced by molecular spinning. Different from the previous spectroscopic and Coulomb explosion imaging techniques, the angular high-harmonic spectroscopy method can reveal additionally the electronic structure and multiple orbitals of the sampled molecule. All the experimental findings are well reproduced by numerical simulations. Further extension of this method would provide a powerful tool for probing complex polyatomic molecules with HHG spectroscopy.en-US©2018 American Physical Society. All rights reserved. Physical Review Letters™ is a trademark of the American Physical Society, registered in the United States, Canada, European Union, and Japan. The APS Physics logo and Physics logo are trademarks of the American Physical Society. Information about registration may be found here. Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement.Text