Multi-Photon Photoemission

Ultraviolet photoemission spectroscopy is a well established experimental technique for the investigation of the electronic structure of bulk and surface states of solids. While the preponderance of work has examined the ground states of materials, inverse photoemission being one exception, an important area of study lies in the domain of excited-states. Mulit-photon photoemission involving the use of intense laser beams enables researchers to take advantage of the powerful experimental and analytical machinery built up around photoemission spectroscopy for the study of excited-states of solids and surfaces. In addition to spectroscopic studies, multi-photon laser photoemission is a technique capable of revealing excited state dynamics directly in the time-domain, on time scales as short as femtoseconds.