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 Title: PHOTOELECTRON SATELLITES AND ANGULAR DISTRIBUTION ASYMMETRY PARAMETERS OF ARGON ATOM STUDIED USING HHG EUV LIGHT Author(s): Ma, Xinwen Contributor(s): Zhao, Dongmei ; Lei, Jianting ; Dong, Dapu ; Najjari, Bennaceur ; Zhang, Min ; Zhang, Shaofeng ; Hai, Bang Subject(s): Instrument/Technique Demonstration Abstract: We have investigated the photoelectron properties of argon atom in the photon energy range near photoionization threshold, employing a reaction microscope and a newly-built HHG-based EUV laser system. Photoelectron spectra and angular distribution were obtained through momentum imaging for photoelectrons. Seven satellites were resolved besides the 3s and 3p main lines. The asymmetry parameters $\beta$ were determined for both the main lines and the satellites. It is found that our measured $\beta$ for the 3p and 3s main lines are in an excellent agreement with previous results reported by Houlgate et al. [1], Dehmer et al. [2], Adam et al. [3], which demonstrates the reliability of the new system and the data analysis procedure. Furthermore, by analyzing the angular distribution of quasi-degenerate satellites, the branch ratio was obtained, which accord closely with theoretical value. The $\beta$ parameters measured for the satellites are reported for the first time in this energy range, providing benchmark data for testing different theoretical models. [1] R. Houlgate, J. West, K. Codling, and G. Marr, Journal of Electron Spectroscopy and Related Phenomena 9, 205 (1976). [2] J. L. Dehmer, W. A. Chupka, J. Berkowitz, and W. T. Jivery, Phys. Rev. A 12, 1966 (1975). [3] M. Y. Adam, P. Morin, and G. Wendin, Phys. Rev. A 31, 1426 (1985) [4] B. Hai, et al., submitted to Phys. Rev. A (2020) Issue Date: 23-Jun-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/107646 Date Available in IDEALS: 2020-06-26
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