Cluster cross sections from pickup measurements: Are the established methods consistent?

Fedor, Juraj; Poterya, Viktoriya; Pysanenko, Andriy; Fárnı́k, Michal

doi:10.1063/1.3633474

Cited by 31 publications

(50 citation statements)

References 61 publications

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“…We have observed the variation of the pickup cross section for various molecules already previously for argon clusters. 7 The pickup cross section is determined by the strength and extent of the interaction potential between the picked-up molecule and the cluster constituents and also by the mass of the molecule and relative velocity. The later issue is discussed below.…”

Section: Discussionmentioning

confidence: 99%

“…IV. The previous investigations 7,8 showed that this simple model described the final velocity dependence very accurately for argon clusters.…”

Section: B Pickup Cross Sectionmentioning

confidence: 99%

“…7 The method is based on the assumption that water clusters in the beam are slowed down by the pickup due to the momentum transfer, and the velocity change increases with the number of guest molecules. Let us assume cluster of a size N with an initial velocity v i colliding with k stationary molecules in the pickup cell which stick to the cluster.…”

Section: B Pickup Cross Sectionmentioning

confidence: 99%

“…9 We concluded that only the first method yielded the correct and reliable results. 7 This method utilizes the fact that the mean cluster sizē N in supersonic expansions is known and can be controlled by the cluster source conditions. [10][11][12][13] We determine the cross section from variation of the beam velocity with the pickup pressure as outlined in Sec.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we have examined two methods for determining these cross sections with Ar N cluster beams. 7 Our measurements were based on two approaches proposed for determination of the mean clusters size in molecular beams: (i) velocity decrease due to the pickup of molecules by the cluster; 8 (ii) Poisson distribution measurements. 9 We concluded that only the first method yielded the correct and reliable results.…”

Section: Introductionmentioning

confidence: 99%

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Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections

Lengyel

Kočišek

Poterya

et al. 2012

The Journal of Chemical Physics

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Uptake of several atmospheric molecules on free ice nanoparticles was investigated. Typical examples were chosen: water, methane, NO x species (NO, NO 2 ), hydrogen halides (HCl, HBr), and volatile organic compounds (CH 3 OH, CH 3 CH 2 OH). The cross sections for pickup of these molecules on ice nanoparticles (H 2 O) N with the mean size ofN ≈ 260 (diameter ∼2.3 nm) were measured in a molecular beam experiment. These cross sections were determined from the cluster beam velocity decrease due to the momentum transfer during the pickup process. For water molecules molecular dynamics simulations were performed to learn the details of the pickup process. The experimental results for water are in good agreement with the simulations. The pickup cross sections of ice particles of several nanometers in diameter can be more than 3 times larger than the geometrical cross sections of these particles. This can have significant consequences in modelling of atmospheric ice nanoparticles, e.g., their growth.

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Section: Discussionmentioning

confidence: 99%

“…IV. The previous investigations 7,8 showed that this simple model described the final velocity dependence very accurately for argon clusters.…”

Section: B Pickup Cross Sectionmentioning

confidence: 99%

Section: B Pickup Cross Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections

Lengyel

Kočišek

Poterya

et al. 2012

The Journal of Chemical Physics

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Understanding the Formation and Growth of New Atmospheric Particles at the Molecular Level through Laboratory Molecular Beam Experiments

Wang,

Zhan,

et al. 2024

ChemPlusChem

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Atmospheric new particle formation (NPF), which exerts comprehensive implications for climate, air quality and human health, has received extensive attention. From molecule to cluster is the initial and most important stage of the nucleation process of atmospheric new particles. However, due to the complexity of the nucleation process and limitations of experimental characterization techniques, there is still a great uncertainty in understanding the nucleation mechanism at the molecular level. Laboratory‐based molecular beam methods can experimentally implement the generation and growth of typical atmospheric gas‐phase nucleation precursors to nanoscale clusters, characterize the key physical and chemical properties of clusters such as structure and composition, and obtain a series of their physicochemical parameters, including association rate coefficients, electron binding energy, pickup cross section and pickup probability and so on. These parameters can quantitatively illustrate the physicochemical properties of the cluster, and evaluate the effect of different gas phase nucleation precursors on the formation and growth of atmospheric new particles. We review the present literatures on atmospheric cluster formation and reaction employing the experimental method of laboratory molecular beam. The experimental apparatuses were classified and summarized from three aspects of cluster generation, growth and detection processes.

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Mass spectrometry of aerosol particle analogues in molecular beam experiments

Fárnı́k

Lengyel

2017

Mass Spectrometry Reviews

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Nanometer-size particles such as ultrafine aerosol particles, ice nanoparticles, water nanodroplets, etc, play an important, however, not yet fully understood role in the atmospheric chemistry and physics. These species are often composed of water with admixture of other atmospherically relevant molecules. To mimic and investigate such particles in laboratory experiments, mixed water clusters with atmospherically relevant molecules can be generated in molecular beams and studied by various mass spectrometric methods. The present review demonstrates that such experiments can provide unprecedented details of reaction mechanisms, and detailed insight into the photon-, electron-, and ion-induced processes relevant to the atmospheric chemistry. After a brief outline of the molecular beam preparation, cluster properties, and ionization methods, we focus on the mixed clusters with various atmospheric molecules, such as hydrated sulfuric acid and nitric acid clusters, N O and halogen-containing molecules with water. A special attention is paid to their reactivity and solvent effects of water molecules on the observed processes.

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Cluster cross sections from pickup measurements: Are the established methods consistent?

Cited by 31 publications

References 61 publications

Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections

Uptake of atmospheric molecules by ice nanoparticles: Pickup cross sections

Understanding the Formation and Growth of New Atmospheric Particles at the Molecular Level through Laboratory Molecular Beam Experiments

Mass spectrometry of aerosol particle analogues in molecular beam experiments

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