A novel “<i>correlated ion and neutral time of flight</i>” method: Event-by-event detection of neutral and charged fragments in collision induced dissociation of mass selected ions

Teyssier, C.; Fillol, R.; Abdoul‐Carime, H.; Farizon, B.; Farizon, M.; Märk, T.D.

doi:10.1063/1.4863015

Cited by 15 publications

(16 citation statements)

References 14 publications

(10 reference statements)

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“…In this paper we have demonstrated the ability to measure cross sections and branching ratios using the recently developed COINTOF technique [13]. The present study is dedicated to the interaction of mass-and-energy selected H + (H 2 O) 2−8 beams with an argon gas target at an energy of 8 keV.…”

Section: Discussionmentioning

confidence: 99%

“…The experimental data have been taken with an apparatus (Device for Irradiation of Molecular Clusters, 'Dispositif d'Irradiation d'Agrégats Moléculaire,' DIAM) recently constructed at the Institut de Physique Nucléaire de Lyon (IPNL). It involves an event-by-event mass spectrometry detection technique called correlated ion and neutral fragment time of flight (COINTOF) [13]. The latter device enables us to detect and identify in a correlated manner all the neutral and charged fragments produced for each collision event.…”

Section: Introductionmentioning

confidence: 99%

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Collision-induced dissociation of protonated water clusters

et al. 2014

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Collision-induced dissociation (CID) has been studied for protonated water clusters H + (H 2 O) n , with n = 2-8, colliding with argon atoms at a laboratory energy of 8 keV. The experimental data have been taken with an apparatus (Device for Irradiation of Molecular Clusters, 'Dispositif d'Irradiation d'Agrégats Moléculaire,' DIAM) that has been recently constructed at the Institut de Physique Nucléaire de Lyon. It includes an event-by-event mass spectrometry detection technique, COINTOF (correlated ion and neutral fragment time of flight). The latter device allows, for each collision event, to detect and identify in a correlated manner all produced neutral and charged fragments. For all the studied cluster ions, it has allowed us to identify branching ratios for the loss of i = 1 to i = n water molecules, leading to fragment ions ranging from H + (H 2 O) i=n−1 all the way down to the production of protons. Using a corresponding calibration technique we determine total charged fragment production cross sections for incident protonated water clusters H + (H 2 O) n , with n = 2-7. Observed trends for branching ratios and cross sections, and a comparison with earlier data on measured attenuation cross sections for water clusters colliding with other noble gases (He and Xe), give insight into the underlying dissociation mechanisms.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Collision-induced dissociation of protonated water clusters

et al. 2014

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“…In this context,t he protective effecto ft he solvating environment has been observed in an umber of studies,f or example, in 50 keV collision-induced dissociation (CID) of clusters of water and adenosine 5'-monophosphate anions, [2] in high-energy collisions (up to 300 keV) of multiply charged ions with aminoa cid clusters and adenine-water clusters, [3] or adenine-water clusters investigated by using UV multiphoton ionization (MPI) and electron impacti onization. [9,10] The initial kinetic energy of the parenti ons is tuned, accordingly,t oo btain the same velocity of 95 10 3 ms À1 in the laboratory frame for all cluster sizes. One of these reactions is proton transfer (PT), which has attracted interest in many areas of chemistry and, in particular, in biology.…”

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confidence: 99%

“…[9,10] The initial kinetic energy of the parenti ons is tuned, accordingly,t oo btain the same velocity of 95 10 3 ms À1 in the laboratory frame for all cluster sizes. [9,10] The initial kinetic energy of the parenti ons is tuned, accordingly,t oo btain the same velocity of 95 10 3 ms À1 in the laboratory frame for all cluster sizes.…”

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confidence: 99%

“…In the case of PyH + (H 2 O) 2 ,s olvation by the second water molecule resultsi nl owering this ratio of energy required for the two differentc hannels to approximately 3. [9,10] The charged-fragment mass spectrum for PyH + obtained by using CID is also reported for comparison. Indeed, the PA of Py is 2.48 eV higher that PA of H 2 O[ (PA(Py) 9.64 eV [13,12] vs. PA(H 2 O) 7.16 eV [14] ]; however,t his difference in PA is only 1.24 eV when compared to the PA of the water dimer [PA(Py) 9.64 eV [12,13] vs. PA((H 2 O) 2 )8 .4 eV [16] ].…”

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Proton Migration in Clusters Consisting of Protonated Pyridine Solvated by Water Molecules

et al. 2015

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Proton transfer (PT) from protonated pyridine to water molecules is observed after excitation of microhydrated protonated pyridine (Py) clusters PyH(+) (H2 O)n (n=0-5) is induced by a single collision with an Ar atom at high incident velocity (95×10(3) m s(-1) ). Besides the fragmentation channel associated with the evaporation of water molecules, the charged-fragment mass spectrum shows competition between the production of the PyH(+) ion (or its corresponding charged fragments) and the production of H(+) (H2 O) or H(+) (H2 O)2 ions. The increase in the production of protonated water fragments as a function of the number of H2 O molecules in the parent cluster ion as well sd the observation of a stable H(+) (H2 O)2 fragment, even in the case of the dissociation of PyH(+) (H2 O)2 , are evidence of the crucial role of PT in the relaxation process, even for a small number of solvating water molecules.

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Velocity of a Molecule Evaporated from a Water Nanodroplet: Maxwell–Boltzmann Statistics versus Non‐Ergodic Events

et al. 2015

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The velocity of amolecule evaporated from amassselected protonated water nanodroplet is measured by velocity map imaging in combination with ar ecently developed mass spectrometry technique.T he measured velocity distributions allowp robing statistical energy redistribution in ultimately small water nanodroplets after ultrafast electronic excitation. As the droplet sizei ncreases,t he velocity distribution rapidly approaches the behavior expected for macroscopic droplets. However,adistinct high-velocity contribution provides evidence of molecular evaporation before complete energy redistribution, corresponding to non-ergodic events.The evaporation of water occurs through the breaking of one or several hydrogen bonds.T hese hydrogen bonds are responsible for many of the remarkable features of water [1] that are essential to life.W ater is known for its exceptional ability to absorb and hold heat at the macroscopic level, whereas at the sub-microscopic level, the intermolecular transfer of vibrational energy is known to be ultrafast because of the strong interactions between OÀHo scillators. [2,3] Thequantitative description of energy transfer in hydrogen-bonded compounds after electronic excitation is particularly challenging. Foralarge water droplet, the evaporation of water manifests itself as av elocity distribution of the evaporated molecules obeying Maxwell-Boltzmann (MB) statistics as ar esult of energy equipartitioning in athermalized system. In the present letter we address the thermalizing ability of even as mall water droplet following the sudden excitation of one of its molecules.Protonated water nanodroplets,H + (H 2 O) n=2-8 ,a re produced by supersonic expansion followed by electron impact ionization and acceleration at 8keV energy.T hey are then mass-and velocity-selected more than 1 msa fter being formed.[4] As ingle high-velocity collision (with V i in the laboratory frame ranging from 10 5 to 2.10 5 ms À1)w ith an Ar atom leads to energy deposition in the droplet by electronic excitation [5] of one of the molecules on atypical time scale of af raction of af emtosecond.[6] High-velocity collisions [7,8] probe ab road range of energy deposition, in contrast to Figure 1. Velocity map imaging of molecules evaporated from water nanodroplets. Evaporation is induced by asingle collision between amass-selectedprotonated water nanodropleta nd an argon atom. The nanodroplet has aselected laboratoryframe velocity V i before the collision. The evaporated H 2 Omolecule acquires an additionalt ransverse velocity, V t, (with respect to the original flight direction of the droplet) and reaches the detectorplaced at adistance D = 250 mm from the collision point. The impact position, R,o fthe evaporated molecule on the detector is related to the velocity, V,o fthe evaporated molecule in the center-of-mass reference frame of the nanodroplet.

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A novel “correlated ion and neutral time of flight” method: Event-by-event detection of neutral and charged fragments in collision induced dissociation of mass selected ions

Cited by 15 publications

References 14 publications

Collision-induced dissociation of protonated water clusters

Collision-induced dissociation of protonated water clusters

Proton Migration in Clusters Consisting of Protonated Pyridine Solvated by Water Molecules

Velocity of a Molecule Evaporated from a Water Nanodroplet: Maxwell–Boltzmann Statistics versus Non‐Ergodic Events

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