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Two-Photon Photoemission Can Map Femtosecond-Lived Unoccupied Bulk States

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We use a tunable 100-fs UV source to demonstrate angle-resolved two-photon photoemission band mapping of bound but unoccupied bulk bands, viz. Cu sp-band. The strong optical pumping overcomes the femtosecond lifetime of this bulk feature.

© 2010 Optical Society of America

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