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Genetic-algorithm retrieval of the molecular alignment distribution with high-order harmonics generated from transiently aligned CO2 molecules

Journal Article · · Physical Review A
 [1];  [2];  [2];  [2];  [3];  [2]
  1. Nanjing Univ. of Science and Technology (China); Fundamental Interactions Team Lead Atomic, Molecular, and Optical Sciences Program Manager
  2. Nanjing Univ. of Science and Technology (China)
  3. Kansas State Univ., Manhattan, KS (United States)
Using genetic algorithm, we propose a method to retrieve the alignment distribution of transiently aligned CO2 molecules from the high-order harmonic generation (HHG) spectra. The retrieval method is based on the quantitative rescattering (QRS) model where averaged photorecombination transition dipole can be factored out from the parallel (or perpendicular) harmonic spectra after the propagation of the harmonic fields in the gas medium. We examine how the retrieved alignment distributions are affected by uncertainty in alignment dependent ionization probability and on multiple orbital contribution to the HHG. We further confirm that alignment distribution is more accurately retrieved by using the minima in the HHG spectra driven by a long-wavelength laser. In addition, we show that earlier experimental data on the ratios between the perpendicular and the parallel HHG components of aligned CO2 molecules are in better agreement with the QRS model if the macroscopic propagation and multiple orbital interference are included in the theoretical calculation.
Research Organization:
Kansas State Univ., Manhattan, KS (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
FG02-86ER13491
OSTI ID:
1846234
Alternate ID(s):
OSTI ID: 1846067
Journal Information:
Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 105; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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