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Role of proton dynamics in efficient photoionization of hydrocarbon molecules

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dc.contributor.author Xie, Xinhua
dc.contributor.author Roither, Stefan
dc.contributor.author Sch¨offler, Markus
dc.contributor.author Xu, Huailiang
dc.contributor.author Bubin, Sergiy
dc.contributor.author L¨otstedt, Erik
dc.contributor.author Erattuphuza, Sonia
dc.contributor.author Iwasaki, Atsushi
dc.contributor.author Kartashov, Daniil
dc.contributor.author Varga, K´alm´an
dc.contributor.author Paulus, Gerhard G.
dc.contributor.author Baltuˇska, Andrius
dc.contributor.author Yamanouchi, Kaoru
dc.contributor.author Kitzler, Markus
dc.date.accessioned 2016-02-01T05:34:11Z
dc.date.available 2016-02-01T05:34:11Z
dc.date.issued 2014
dc.identifier.citation Xinhua Xie, Stefan Roither, Markus Sch¨offler, Huailiang Xu, Sergiy Bubin, Erik L¨otstedt, Sonia Erattuphuza, Atsushi Iwasaki, Daniil Kartashov, K´alm´an Varga, Gerhard G. Paulus, Andrius Baltuˇska, Kaoru Yamanouchi, Markus Kitzler; 2014; Role of proton dynamics in efficient photoionization of hydrocarbon molecules; PHYSICAL REVIEW A ru_RU
dc.identifier.uri http://nur.nu.edu.kz/handle/123456789/1129
dc.description.abstract We experimentally investigate the ionizationmechanism behind the formation of remarkably high charge states observed in the laser-pulse-induced fragmentation of different hydrocarbon molecules by Roither et al. [Phys. Rev. Lett. 106, 163001 (2011)], who suggested enhanced ionization occurring at multiple C-H bonds as the underlying ionization mechanism. Using multiparticle coincidence momentum imaging we measure the yield of multiply charged fragmenting ethylene and acetylene molecules at several intensities and pulse durations ranging from the few-cycle regime to 25 fs. We observe, at constant intensity, a strong increase of the proton energy with increasing laser pulse duration. It is shown that this is caused by a strong increase in the yield of highly charged parent molecular ions with pulse duration. Based on experimental evidence we explain this increase by the necessary population of precursor states in the parent ion that feature fast C-H stretch dynamics to the critical internuclear distance, where efficient ionization via enhanced ionization takes place. For increasing pulse duration these precursor ionic states are more efficiently populated, which leads in turn to a higher enhanced-ionization probability for longer pulses. Our work provides experimental evidence for the existence of a multiple-bond version of enhanced ionization in polyatomic molecules ru_RU
dc.language.iso en ru_RU
dc.rights Attribution-NonCommercial-ShareAlike 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/3.0/us/ *
dc.subject Research Subject Categories::NATURAL SCIENCES::Physics ru_RU
dc.subject hydrocarbon molecules ru_RU
dc.title Role of proton dynamics in efficient photoionization of hydrocarbon molecules ru_RU
dc.type Article ru_RU

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