Pump-probe photoelectron spectroscopy by a high-power 90 nm vacuum-ultraviolet laser

摘要

We present pump-probe photoelectron spectroscopy of Kr and NO using a high-power vacuum-ultraviolet (VUV) laser at a wavelength of 90 nm. Clear quantum beats are observed in the photoelectron angular distributions as well as in the photoelectron yields, resulting from the coherent excitation of two Kr Rydberg states by the VUV pump. The entire Franck-Condon envelope of the NO A(~2∑~+) excited state is also successfully captured by the VUV probe.