Extensive water cluster fragmentation after low energy electron ionization

Lengyel, Jozef; Pysanenko, Andriy; Poterya, Viktoriya; Kočišek, Jaroslav; Fárnı́k, Michal

doi:10.1016/j.cplett.2014.08.038

Cited by 50 publications

(63 citation statements)

References 54 publications

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“…From Figure 1a2-b2, it is evident that PI increases the signal intensity (2-3 times higher than EI) and promotes the extension of the detected clusters mass range in comparison with EI. This is in agreement with the higher expected fragmentation after electron ionization found for water clusters [31]. The comparison with pure water clusters spectra reported in a previous work [5] reveals that the clusters mass distribution is very similar only for the more diluted solution (V E /V S = 5%) (Figure 1a1 and a2).…”

Section: Mass Spectrometric Analysis Of Ethanol-water Clusterssupporting

confidence: 79%

Insights on Clusters Formation Mechanism by Time of Flight Mass Spectrometry. 1. The Case of Ethanol–Water Clusters

Apicella

Passaro

2015

J. Am. Soc. Mass Spectrom.

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Abstract. In the present work, water clusters with the addition of an electrophilic molecule such as ethanol have been studied by time of flight mass spectrometry (TOFMS). Mass distributions of molecular clusters of ethanol, water, and ethanolwater mixed clusters were obtained by two different ionization methods: electron ionization (EI) and picosecond laser photo-ionization (PI) at a wavelength of 355 nm. It was shown that short pulse laser ionization increases the signal intensity and promotes the extension of the detected mass range of the clusters in comparison with EI. Much larger clusters were detected in our experiments with respect to the current literature. The autocorrelation function (AF) was introduced in the analysis of the composition of the water clusters in terms of fundamental periodicities for obtaining information on clusters formation mechanisms. Besides, it was found that ethanol molecules are capable of substitutional interaction with hydrogen-bonded water clusters in ethanol-water binary mixtures but the self-association of ethanol was the dominant process. Moreover, the increase of ethanol concentration promotes both the formation of hydrated ethanol clusters and the self-association of ethanol clusters in ethanol-water binary mixtures. The formation of water-rich clusters and subsequent metastable fragmentation were found to be the dominant processes determining the water-rich cluster distribution, irrespective of the ionization process, while the ionization process significantly affects the ethanol-rich cluster distribution.

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Section: Mass Spectrometric Analysis Of Ethanol-water Clusterssupporting

confidence: 79%

Insights on Clusters Formation Mechanism by Time of Flight Mass Spectrometry. 1. The Case of Ethanol–Water Clusters

Apicella

Passaro

2015

J. Am. Soc. Mass Spectrom.

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“…Heavy fragmentation was observed e.g. for large ionized water or ammonia clusters [42,43]. The present simulations demonstrate that enough excess energy is available even when the weakly bound electron is detached from the chloride anion.…”

Section: Discussionmentioning

confidence: 74%

Fragmentation of HCl–water clusters upon ionization: Non-adiabatic ab initio dynamics study

Hollas

Svoboda

Slavı́ček

2015

Chemical Physics Letters

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“…The molecular aggregates are ionized by single-photon ionization close to the lowest ionization threshold using a homebuilt, tunable VUV laser at energies between 6 and 18 eV. Single-photon threshold ionization is in general a soft ionization method even for the weakly-bound molecular aggregates studied here [33][34][35][36][37][38]. The ions are mass separated using a Wiley-McLaren type time-of-flight (TOF) configuration, which has been optimized for better time-focusing compared with the recently described configuration in ref.…”

Section: Methodsmentioning

confidence: 99%

“…For many compounds, threshold VUV ionization is a soft ionization method and thus minimizes fragmentation. This is even the case for weakly-bound molecular aggregates [33][34][35][36][37][38], which are the subject of the present investigation. Furthermore, the tunability of the VUV laser makes this ionization method broadly applicable to many compounds.…”

Section: Introductionmentioning

confidence: 91%

Can we Observe Gas Phase Nucleation at the Molecular Level?

Ferreiro

Gartmann

Schläppi

et al. 2015

Zeitschrift Für Physikalische Chemie

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We propose and discuss an experiment for the study of neutral gas phase nucleation on a molecular level using propane as the condensable gas. The experiment combines a uniform Laval expansion with soft mass spectrometric detection. The uniform Laval expansion allows nucleation experiments under welldefined conditions while the mass spectrometric detection provides molecularlevel information on the molecular aggregates formed. It is discussed how one could observe the onset of nucleation and retrieve the size of the critical nucleus from the mass spectra.

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Extensive water cluster fragmentation after low energy electron ionization

Cited by 50 publications

References 54 publications

Insights on Clusters Formation Mechanism by Time of Flight Mass Spectrometry. 1. The Case of Ethanol–Water Clusters

Insights on Clusters Formation Mechanism by Time of Flight Mass Spectrometry. 1. The Case of Ethanol–Water Clusters

Fragmentation of HCl–water clusters upon ionization: Non-adiabatic ab initio dynamics study

Can we Observe Gas Phase Nucleation at the Molecular Level?

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