title: Joint Measurements of Terahertz Wave Generation and High-Harmonic Generation from Aligned Nitrogen Molecules Reveal Angle-Resolved Molecular Structures.
abstract: We report the synchronized measurements of terahertz wave generation and high-harmonic generation from aligned nitrogen molecules in dual-color laser fields. Both yields are found to be alignment dependent, showing the importance of molecular structures in the generation processes. By calibrating the angular ionization rates with the terahertz yields, we present a new way of retrieving the angular differential photoionization cross section (PICS) from the harmonic signals which avoids specific model calculations or separate measurements of the alignment-dependent ionization rates. The measured PICS is found to be consistent with theoretical predications, although some discrepancies exist. This all-optical method provides a new alternative for investigating molecular structures.
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.
authors.forename: Yindong
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.
authors.forename: Chao
authors.initials: C
authors.lastname: Meng
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Lü
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.
authors.forename: Dongwen
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Chen
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.|IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Yuan
authors.affiliation: Department of Physics, College of Science, National University of Defense Technology, Changsha 410073, Hunan, People's Republic of China.
authors.forename: Zengxiu
authors.initials: Z
authors.lastname: Zhao