title: High harmonic spectra contributed by HOMO-1 orbital of aligned CO2 molecules.
abstract: We observe the high harmonic generation (HHG) from anti-aligned CO(2) molecules when the on-axis peak of HHG from HOMO-2 orbital disappears. The harmonic emission at anti-alignment can be attributed to the contribution of HOMO-1 orbital. Simulations reproduce these observations and reveal the angular distributions of tunneling ionization from HOMO and HOMO-1 respectively at different intensity. The determination of HOMO-1 orbital contributions in harmonic spectra is important for the tomography imaging of aligned molecules and analysis of the time evolved harmonic emission.
authors.affiliation: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Li
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.forename: Hua
authors.initials: H
authors.lastname: Yang
authors.forename: Liwei
authors.initials: L
authors.lastname: Song
authors.forename: Shitong
authors.initials: S
authors.lastname: Zhao
authors.forename: Hui
authors.initials: H
authors.lastname: Lu
authors.forename: Ruxin
authors.initials: R
authors.lastname: Li
authors.forename: Zhizhan
authors.initials: Z
authors.lastname: Xu
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D003198:Computer Simulation; D008956:Models, Chemical; D013057:Spectrum Analysis / Q000379:methods*
chemical_list: D002245:Carbon Dioxide