Ions Colliding with Cold Polycyclic Aromatic Hydrocarbon Clusters

Holm, Anne I. S.; Zettergren, Henning; Johansson, H.; Seitz, F.; Rosén, Stefan; Schmidt, H. T.; Ławicki, A.; Rangama, Jimmy; Rousseau, Patrick; Capron, Michaël; Maisonny, R.; Adoui, L.; Méry, A.; Manil, B.; Huber, B. A.; Cederquist, H.

doi:10.1103/physrevlett.105.213401

Cited by 75 publications

(63 citation statements)

References 33 publications

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“…It is worth mentioning that, to the best of our knowledge, this is the first detailed electron spectroscopy based measurement of PAHs perturbed by the energetic ions. Apart from photoionization and photofragmentation studies 27,28 , the existing literature of ion impact mainly includes post collision recoil-ion based measurements 29–36 . Other than that there are some reports available which demonstrate the energy loss mechanism of the energetic ionic projectiles within the PAHs 13,36–38 .…”

Section: Introductionmentioning

confidence: 99%

Differential electron emission from polycyclic aromatic hydrocarbon molecules under fast ion impact

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Weck

et al. 2017

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Interaction between polycyclic aromatic hydrocarbon (PAH) molecule and energetic ion is a subject of interest in different areas of modern physics. Here, we present measurements of energy and angular distributions of absolute double differential electron emission cross section for coronene (C24H12) and fluorene (C13H10) molecules under fast bare oxygen ion impact. For coronene, the angular distributions of the low energy electrons are quite different from that of simpler targets like Ne or CH4, which is not the case for fluorene. The behaviour of the higher electron energy distributions for both the targets are similar to that for simple targets. In case of coronene, a clear signature of plasmon resonance is observed in the analysis of forward-backward angular asymmetry of low energy electron emission. For fluorene, such signature is not identified probably due to lower oscillator strength of plasmon compared to the coronene. The theoretical calculation based on the first-order Born approximation with correct boundary conditions (CB1), in general, reproduced the experimental observations qualitatively, for both the molecules, except in the low energy region for coronene, which again indicates the role of collective excitation. Single differential and total cross sections are also deduced. An overall comparative study is presented.

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Section: Introductionmentioning

confidence: 99%

Differential electron emission from polycyclic aromatic hydrocarbon molecules under fast ion impact

Biswas

Champion

Weck

et al. 2017

Sci Rep

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“…This shows that the n C =e ¼ 120, 119, 118 peaks are due to cluster fragmentation processes. The peak at n C =e ¼ 120 may be due to (i) ½C 60 þ 2 dimers remaining after emissions of C 60 þ ions and C 60 molecules from larger clusters similar to what has been observed for other loosely bound cluster systems [17,18], and/or (ii) C 60 þ þ C 60 ! C 120 þ covalent bond formation.…”

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confidence: 91%

“…2). The reason is that the electronic excitation energy is distributed rapidly [25,26] over the whole cluster before fragmentation such that the individual molecules most often become sufficiently cold to stay intact [17].…”

Section: H Y S I C a L R E V I E W L E T T E R S Week Ending 3 May 2013mentioning

confidence: 99%

Formations of DumbbellC118andC119inside Clusters ofC60
Zettergren
¹
,
Rousseau
²
,
Wang
³

et al. 2013
Phys. Rev. Lett.
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We report highly selective covalent bond modifications in collisions between keV alpha particles and van der Waals clusters of C 60 fullerenes. Surprisingly, C 119 þ and C 118 þ are the dominant molecular fusion products. We use molecular dynamics simulations to show that C 59 þ and C 58 þ ions-effectively produced in prompt knockout processes with He 2þ -react rapidly with C 60 to form dumbbell C 119 þ and C 118 þ . Ion impact on molecular clusters in general is expected to lead to efficient secondary reactions of interest for astrophysics. These reactions are different from those induced by photons. DOI: 10.1103/PhysRevLett.110.185501 PACS numbers: 61.48.Àc, 31.15.xv, 36.40.Qv Photodriven intracluster reactions have been observed in clusters of fullerenes [1,2] and in, e.g., clusters of methanol, water, dimethyl ether, and acetic acid molecules [3]. Clusters of fullerenes are of particular interest in this context as C 60 and C 70 recently have been observed in space [4,5] at temperatures indicating that they may reside on grains [4] or are in the solid phase (fullerite) [6]. The question of how fullerenes form in space and elsewhere [7][8][9] is still open and here we report experimental observations on specific very efficient fullerene growth processes inside small pieces of fullerite material. These ion-impact induced growth processes in which so-called dumbbell fullerene systems are formed are inherently different from the ones induced by photons [1,2] for reasons that will be discussed in the following.The lowest energy barrier for formation of covalently bound dumbbell C 120 from two neutral C 60 molecules is roughly one or two electron volts [10]. Thus, two C 60 molecules in their ground states may, in principle, form such a C 120 system when the center-of-mass kinetic energy is larger than this barrier. However, molecular dynamics simulations by Jakowski, Irle, and Morokuma [11] have shown that, in practice, much larger kinetic energies are needed to form dumbbell C 120 (* 60 eV) or single-cage C 120 (*100 eV) efficiently [11]. The reason is that at least one C 60 cage needs to rearrange to form covalent bonds with the other cage on very short, picosecond, time scales. This is highly unlikely in a single encounter at low kinetic energy, as the transferred energy is redistributed over the fullerene molecule and a critical energy needs to be localized in a specific bond in order to break it. On the other hand, the reverse reaction (dissociation) may proceed at much lower energies but after many vibrations and on much longer time scales. For C 60 -C 60 collisions at kinetic energies above 60/100 eV covalent bond formation becomes much more likely but will then also give internally hot dumbbell/single-cage C 120 . Single-cage C 120 will fragment through sequences of C 2 emissions yielding molecular mass distributions with an even number of carbon atoms [1] as C 2 loss is the lowest-energy dissociation channel at about 10 eV. The dumbbell C 120 ! C 60 þ C 60 dissociation energy is only a couple of eV [1...

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“…The irradiation of PAH molecules contained in condensed films * prousseau@ganil.fr has also been performed with photons [11] and with proton beams [12]. However only recently, studies of the interaction of ions with PAH molecules in the gas phase have been made, concentrating on the ionization and fragmentation of linearly catacondensed anthracene (C 14 H 10 ) monomers [13] and clusters [14]. Many of the experimental and theoretical studies are dedicated to the coronene (C 24 H 12 ) molecule, which is formed by seven centrally condensed six-membered carbon rings representing a D 6h geometry.…”

Section: Introductionmentioning

confidence: 99%

Multiple ionization and fragmentation of isolated pyrene and coronene molecules in collision with ions

et al. 2011

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International audienceThe interaction of multiply charged ions (He(2+), O(3+), and Xe(20+)) with gas-phase pericondensed polycyclic aromatic hydrocarbon (PAH) molecules of coronene (C(24)H(12)) and pyrene (C(16)H(10)) is studied for low-velocity collisions (v <= 0.6 a.u.). The mass spectrometric analysis shows that singly and up to quadruply charged intact molecules are important reaction products. The relative experimental yields are compared with the results of a simple classical over-the-barrier model. For higher molecular charge states, the experimental yields decrease much more strongly than the model predictions due to the instabilities of the multiply charged PAH molecules. Even-odd oscillations with the number of carbon atoms, n, in the intensity distributions of the C(n)H(x)(+) fragments indicate a linear chain structure of the fragments similar to those observed for ion-C(60) collisions. The latter oscillations are known to be due to dissociation energy differences between even-and odd-n C(n)-chain molecules. For PAH molecules, the average numbers of H atoms attached to the C(n)H(x) chains are larger for even-n reflecting acetylenic bond systems

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Ions Colliding with Cold Polycyclic Aromatic Hydrocarbon Clusters

Cited by 75 publications

References 33 publications

Differential electron emission from polycyclic aromatic hydrocarbon molecules under fast ion impact

Differential electron emission from polycyclic aromatic hydrocarbon molecules under fast ion impact

Formations of DumbbellC118andC119inside Clusters ofC60
Zettergren
¹
,
Rousseau
²
,
Wang
³

et al. 2013
Phys. Rev. Lett.
Self Cite
65
2
48
0
View full text Add to dashboard Cite

Multiple ionization and fragmentation of isolated pyrene and coronene molecules in collision with ions

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Ions Colliding with Cold Polycyclic Aromatic Hydrocarbon Clusters

Cited by 75 publications

References 33 publications

Differential electron emission from polycyclic aromatic hydrocarbon molecules under fast ion impact

Differential electron emission from polycyclic aromatic hydrocarbon molecules under fast ion impact

Formations of DumbbellC118andC119inside Clusters ofC60Zettergren1, Rousseau2, Wang3 et al. 2013Phys. Rev. Lett.Self Cite652480View full textAdd to dashboardCite

Multiple ionization and fragmentation of isolated pyrene and coronene molecules in collision with ions

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Formations of DumbbellC118andC119inside Clusters ofC60
Zettergren
¹
,
Rousseau
²
,
Wang
³

et al. 2013
Phys. Rev. Lett.
Self Cite
65
2
48
0
View full text Add to dashboard Cite