Role of proton dynamics in efficient photoionization of hydrocarbon molecules

Xinhua Xie, Stefan Roither, Markus Schöffler, Huailiang Xu, Sergiy Bubin, Erik Lötstedt, Sonia Erattuphuza, Atsushi Iwasaki, Daniil Kartashov, Kálmán Varga, Gerhard G. Paulus, Andrius Baltuška, Kaoru Yamanouchi, Markus Kitzler

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We experimentally investigate the ionization mechanism 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)PRLTAO0031-900710.1103/PhysRevLett.106.163001], 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.

Original languageEnglish
Article number023429
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume89
Issue number2
DOIs
Publication statusPublished - Feb 26 2014
Externally publishedYes

Fingerprint

photoionization
hydrocarbons
ionization
protons
pulse duration
molecules
polyatomic molecules
proton energy
pulses
molecular ions
acetylene
lasers
fragmentation
ethylene
momentum
cycles
ions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Role of proton dynamics in efficient photoionization of hydrocarbon molecules. / Xie, Xinhua; Roither, Stefan; Schöffler, Markus; Xu, Huailiang; Bubin, Sergiy; Lötstedt, Erik; Erattuphuza, Sonia; Iwasaki, Atsushi; Kartashov, Daniil; Varga, Kálmán; G. Paulus, Gerhard; Baltuška, Andrius; Yamanouchi, Kaoru; Kitzler, Markus.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 89, No. 2, 023429, 26.02.2014.

Research output: Contribution to journalArticle

Xie, X, Roither, S, Schöffler, M, Xu, H, Bubin, S, Lötstedt, E, Erattuphuza, S, Iwasaki, A, Kartashov, D, Varga, K, G. Paulus, G, Baltuška, A, Yamanouchi, K & Kitzler, M 2014, 'Role of proton dynamics in efficient photoionization of hydrocarbon molecules', Physical Review A - Atomic, Molecular, and Optical Physics, vol. 89, no. 2, 023429. https://doi.org/10.1103/PhysRevA.89.023429
Xie, Xinhua ; Roither, Stefan ; Schöffler, Markus ; Xu, Huailiang ; Bubin, Sergiy ; Lötstedt, Erik ; Erattuphuza, Sonia ; Iwasaki, Atsushi ; Kartashov, Daniil ; Varga, Kálmán ; G. Paulus, Gerhard ; Baltuška, Andrius ; Yamanouchi, Kaoru ; Kitzler, Markus. / Role of proton dynamics in efficient photoionization of hydrocarbon molecules. In: Physical Review A - Atomic, Molecular, and Optical Physics. 2014 ; Vol. 89, No. 2.
@article{5ab2047f1d2f413881766c9b69e7c72c,
title = "Role of proton dynamics in efficient photoionization of hydrocarbon molecules",
abstract = "We experimentally investigate the ionization mechanism 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)PRLTAO0031-900710.1103/PhysRevLett.106.163001], 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.",
author = "Xinhua Xie and Stefan Roither and Markus Sch{\"o}ffler and Huailiang Xu and Sergiy Bubin and Erik L{\"o}tstedt and Sonia Erattuphuza and Atsushi Iwasaki and Daniil Kartashov and K{\'a}lm{\'a}n Varga and {G. Paulus}, Gerhard and Andrius Baltuška and Kaoru Yamanouchi and Markus Kitzler",
year = "2014",
month = "2",
day = "26",
doi = "10.1103/PhysRevA.89.023429",
language = "English",
volume = "89",
journal = "Physical Review A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "2",

}

TY - JOUR

T1 - Role of proton dynamics in efficient photoionization of hydrocarbon molecules

AU - Xie, Xinhua

AU - Roither, Stefan

AU - Schöffler, Markus

AU - Xu, Huailiang

AU - Bubin, Sergiy

AU - Lötstedt, Erik

AU - Erattuphuza, Sonia

AU - Iwasaki, Atsushi

AU - Kartashov, Daniil

AU - Varga, Kálmán

AU - G. Paulus, Gerhard

AU - Baltuška, Andrius

AU - Yamanouchi, Kaoru

AU - Kitzler, Markus

PY - 2014/2/26

Y1 - 2014/2/26

N2 - We experimentally investigate the ionization mechanism 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)PRLTAO0031-900710.1103/PhysRevLett.106.163001], 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.

AB - We experimentally investigate the ionization mechanism 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)PRLTAO0031-900710.1103/PhysRevLett.106.163001], 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.

UR - http://www.scopus.com/inward/record.url?scp=84897717358&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897717358&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.89.023429

DO - 10.1103/PhysRevA.89.023429

M3 - Article

VL - 89

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 2

M1 - 023429

ER -