Open-loop and closed-loop control of dissociative ionization of ethanol in intense laser fields

Hiroki Yazawa, Takasumi Tanabe, Tatsuyoshi Okamoto, Mio Yamanaka, Fumihiko Kannari, Ryuji Itakura, Kaoru Yamanouchi

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


The relative yield of the C-O bond breaking with respect to the C-C bond breaking in ethanol cation C2 H5 O H+ is maximized in intense laser fields (1013 - 1015 W cm2) by open-loop and closed-loop optimization procedures. In the open-loop optimization, a train of intense laser pulses are synthesized so that the temporal separation between the first and last pulses becomes 800 fs, and the number and width of the pulses within a train are systematically varied. When the duration of 800 fs is filled with laser fields by increasing the number of pulses or by stretching all pulses in a triple pulse train, the relative yield of the C-O bond breaking becomes significantly large. In the closed-loop optimization using a self-learning algorithm, the four dispersion coefficients or the phases of 128 frequency components of an intense laser pulse are adopted as optimized parameters. From these optimization experiments it is revealed that the yield ratio of the C-O bond breaking is maximized as far as the total duration of the intense laser field reaches as long as ∼1 ps and that the intermittent disappearance of the laser field within a pulse does not affect the relative yields of the bond breaking pathways.

Original languageEnglish
Article number204314
JournalJournal of Chemical Physics
Issue number20
Publication statusPublished - 2006 May 28

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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