Strong-field control of H$^{+}_{3}$ production from methanol dications: Selecting between local and extended formation mechanisms

Iwamoto, Naoki; Schwartz, Charles J.; Jochim, Bethany; P., Kanaka Raju; Feizollah, Peyman; Napierala, J. L.; Severt, T.; Tegegn, S. N.; Solomon, A.; Zhao, S.; Lam, Huynh; Wangjam, Tomthin Nganba; Kumarappan, V.; Carnes, K. D.; Ben-Itzhak, I.; Wells, Eric

doi:10.1063/1.5129946

Title: Strong-field control of H$$^{+}_{3}$$ production from methanol dications: Selecting between local and extended formation mechanisms

Journal Article · Tue Feb 04 00:00:00 EST 2020 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.5129946· OSTI ID:1839519

Iwamoto, Naoki ^[1]; Schwartz, Charles J. ^[1];

^[2]; P., Kanaka Raju ^[2]; Feizollah, Peyman ^[2]; Napierala, J. L. ^[1];

^[2]; Tegegn, S. N. ^[1]; Solomon, A. ^[1]; Zhao, S. ^[1]; Lam, Huynh ^[2]; Wangjam, Tomthin Nganba ^[2];

^[2];

^[1]

Augustana Univ., Sioux Falls, SD (United States)
Kansas State Univ., Manhattan, KS (United States)

Using the partly deuterated methanol (CD₃OH), the ratio of D₂H⁺ to D$$^{+}_{3}$$ formation is manipulated by changing the characteristics of the intense femtosecond laser pulse. Detection of D₂H⁺ indicates a formation process involving two hydrogen atoms from the methyl side of the molecule and a proton from the hydroxyl side, while detection of D$$^{+}_{3}$$ indicates local formation involving only the methyl group. Both mechanisms are thought to involve a neutral D₂ moiety. An adaptive control strategy that employs image-based feedback to guide the learning algorithm results in an enhancement of the D₂H⁺/D$$^{+}_{3}$$ ratio by a factor of approximately two. Furthermore, the optimized pulses have secondary structures 110–210 fs after the main pulse and result in photofragments that have different kinetic energy release distributions than those produced from near transform limited pulses. Systematic changes to the linear chirp and higher order dispersion terms of the laser pulse are compared to the results obtained with the optimized pulse shapes.

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Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF); USDOE

Grant/Contract Number:: FG02-86ER13491

OSTI ID:: 1839519

Alternate ID(s):: OSTI ID: 1597141

Journal Information:: Journal of Chemical Physics, Vol. 152, Issue 5; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Title: Strong-field control of H$$^{+}_{3}$$ production from methanol dications: Selecting between local and extended formation mechanisms

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