Time-of-flight two-photon photoemission spectroscopy on Ag(111)

Cheng-Tien Chiang^1,2,6,7*, Chih-Wei Hsu^5,1, Prabesh Bista^1,2,3, Chien-Fang Ding^4,1, Maximilian Paleschke¹, Mukesh Singh¹, Yu-Chan Lin¹

¹Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
²Molecular Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei, Taiwan
³Department of Physics, National Central University, Taoyuan, Taiwan
⁴Department of Biomechatronics Engineering, National Taiwan University, Taipei, Taiwan
⁵Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan
⁶Department of Physics, National Taiwan University, Taipei, Taiwan
⁷Department of Physics, Tamkang University, New Taipei City, Taiwan

* Presenter:Cheng-Tien Chiang, email:ctchiang@iams.sinica.edu.tw

As a paradigm of laser-based photoemission experiments on metal surfaces, there have been intensive studies of nonlinear photoemission on Ag(111) [1-9]. In our development of femtosecond photoemission spectroscopy using a time-of-flight momentum microscope, we applied ultrashort laser pulses with a photon energy of 3.6 eV at megahertz repetition rates to excite resonant transitions between the occupied and unoccupied bulk sp bands of Ag [3-5]. The characteristic parabolic dispersion of these resonant transitions is clearly visible in the three-dimensional energy-momentum phase space and can be compared with the theoretical band structure of Ag [5,7,8]. Hereby we present detailed experimental setup and data analysis.

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Keywords: photoemission, band structure, nonlinear optics