Speaker: Lucas Zipp, PULSE
Program Description
As our ability to probe atomic and molecular processes in the time domain approaches the attosecond time scale, it has become possible (and necessary) to revisit some fundamental ideas on how processes like photoionization occur in the time domain. Several recent experiments have investigated measuring attosecond-scale "Wigner" delays in single photon ionization [1,2]. I will present our results extending these measurements to the strong field regime, allowing us to probe the intrinsic time delay experienced by an electron as it is ionized in a strong, nonperturbative laser field [3]. In the second part of the talk I will discuss a recent experiment tracking the angular motion of an electron wave packet in a Rydberg manifold of molecular nitrogen. We are able to see directly in the time domain a process of L-uncoupling that up until now has only been inferred from spectroscopic data [4].
[1] K. Kulander et al, "Probing Single-Photon Ionization on the Attosecond Time Scale," Phys. Rev. Lett. 106, 143002 (2011).
[2] M. Schultze et. al, "Delay in Photoemission," Science 328, 1658-1662 (2010).
[3] L. J. Zipp, A. Natan, and P. H. Bucksbaum, "Probing electron delays in above-threshold ionization," Optica 1, 361-364 (2014).
[4] R.-Y. Chang et al, "Observation of L uncoupling in the 5Δg1 Rydberg state of Na2," The Journal of Chemical Physics 123, 224303 (2005).
