Ion yields of laser aligned CH3I and CH3Br from multiple orbitals

Lanhai He, Yun Pan, Yujun Yang, Sizuo Luo, Chunjing Lu, Huifang Zhao, Dongxu Li, Lele Song, Steven Stolte, Dajun Ding*, Wim G. Roeterdink

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


We have measured the alignment influence on ion yields of CH3I and CH3Br molecules in the laser intensity regime from 1013 W/cm2 to 1015 W/cm2. The hexapole state-selection technique combined with laser induced alignment has been employed to obtain aligned (〈P2(cosθ)〉=0.7) and anti-aligned (〈P2(cosθ)〉=-0.1) CH3I and CH3Br molecules. The ratio of saturation intensities observed for the CH3I and CH3Br molecules with different alignments are simulated using a modified PPT model for molecules considering different orbitals and a good agreement has been achieved, indicating the contribution from multiple orbitals in the ionization.

Original languageEnglish
Pages (from-to)141-146
Number of pages6
JournalChemical Physics Letters
Publication statusPublished - 16 Nov 2016


  • Ionization
  • Molecular alignment
  • PPT theory
  • Saturation intensity


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