Collision-induced dissociation of protonated water clusters

Berthias, Francis; Buridon, V.; Abdoul‐Carime, H.; Farizon, B.; Farizon, M.; Dinh, Phuong Mai; Reinhard, P.‐G.; Suraud, E.; Märk, T.D.

doi:10.1103/physreva.89.062705

Cited by 10 publications

(7 citation statements)

References 33 publications

(65 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e) Impact distributions, P ( R ), plotted as a function of the distance R between the impact point and the centroid of the distribution. The areas under the curves are proportional to the branching ratios 14. The black curve, which is normalized to the maximum value attained by the red curve, corresponds to the impact of the non‐dissociated beam.…”

mentioning

confidence: 99%

“…Thet otal kinetic energy released (KER) during the dissociation is partitioned because of momentum conservation, that is,t he evaporated molecule acquires an additional velocity randomly oriented in the center-of-mass reference frame (CMF) of the parent droplet. Differently from previous mass spectrometric measurements of the average kinetic energy release in decaying metastable water cluster ions, [13] the present experiment combines velocity map imaging with the correlated ion and neutral time-of-flight mass spectrometry technique on an event-by-event basis [14][15][16] (COINTOF MS). Measurements are performed on alarge number of individual droplets (typically 10 6 )t hereby obtaining the velocity distribution.…”

mentioning

confidence: 99%

“…The areas under the curves are proportional to the branching ratios. [14] The black curve, which is normalized to the maximum value attained by the red curve, corresponds to the impact of the non-dissociated beam. f) H 2 Ovelocity distributions recovered from the recorded impact positions (continuous lines, red: m = 1, blue: m = 2, green: m = 3; the violet continuousl ine represents their sum).…”

mentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2015

View full text Add to dashboard Cite

The velocity of a molecule evaporated from a mass-selected protonated water nanodroplet is measured by velocity map imaging in combination with a recently developed mass spectrometry technique. The measured velocity distributions allow probing statistical energy redistribution in ultimately small water nanodroplets after ultrafast electronic excitation. As the droplet size increases, the velocity distribution rapidly approaches the behavior expected for macroscopic droplets. However, a distinct high-velocity contribution provides evidence of molecular evaporation before complete energy redistribution, corresponding to non-ergodic events.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The total kinetic energy released (KER) during the dissociation is partitioned because of momentum conservation, that is, the evaporated molecule acquires an additional velocity randomly oriented in the center‐of‐mass reference frame (CMF) of the parent droplet. Differently from previous mass spectrometric measurements of the average kinetic energy release in decaying metastable water cluster ions,13 the present experiment combines velocity map imaging with the correlated ion and neutral time‐of‐flight mass spectrometry technique on an event‐by‐event basis14–16 (COINTOF MS). Measurements are performed on a large number of individual droplets (typically 10 6 ) thereby obtaining the velocity distribution.…”

mentioning

confidence: 99%

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

et al. 2015

View full text Add to dashboard Cite

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.

show abstract

“…The total kinetic energy released (KER) during dissociation was partitioned owing to momentum conservation; i.e., the evaporated molecules acquired an additional velocity randomly oriented in the center-of-mass reference frame of the parent droplet, which resulted in a characteristic change in the impact position within the detection plane. Measurements combining velocity map imaging with the correlated ion and a neutral time-of-flight mass spectrometry technique (COINTOF MS) (25, 26, 48–52) were performed on an event-by-event basis for a large number of individual droplets (typically 10 6 ). The event-by-event analysis of the recorded data was performed in the ROOT software framework (53).…”

Section: Methodsmentioning

confidence: 99%

Impact of a hydrophobic ion on the early stage of atmospheric aerosol formation

Feketeová

Bertier

Salbaing

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

SignificanceGas-to-particle conversion, also known as atmospheric aerosol nucleation, is responsible for about half of the global cloud condensation nuclei. It has been further argued that homogenous ternary nucleation including water is the major pathway for atmospheric aerosol formation. In contrast to earlier results on pure protonated water clusters, the shape of the measured velocity distributions of water molecules evaporated from excited water clusters doped with pyridinium, an abundant anthropogenic ion in the troposphere, shows evidence for out-of-equilibrium evaporation prior to thermalization. Water molecule evaporation is found to be much slower for the doped clusters, indicating in turn how such contaminants facilitate the growth of water clusters and consequently the nucleation processes at the early stages of atmospheric aerosol formation.

show abstract

Collision-induced dissociation of protonated water clusters

Cited by 10 publications

References 33 publications

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

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

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

Impact of a hydrophobic ion on the early stage of atmospheric aerosol formation

Contact Info

Product

Resources

About