A smog chamber study coupling a photoionization aerosol electron/ion spectrometer to VUV synchrotron radiation: organic and inorganic-organic mixed aerosol analysis

Baeza‐Romero, M. T.; Gaie-Levrel, François; Mahjoub, Ahmed; López-Arza, Vicente; Garcı́a, Gustavo; Nahon, Laurent

doi:10.1140/epjd/e2016-70264-8

Eur. Phys. J. D

2016

DOI: 10.1140/epjd/e2016-70264-8

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A smog chamber study coupling a photoionization aerosol electron/ion spectrometer to VUV synchrotron radiation: organic and inorganic-organic mixed aerosol analysis

M. T. Baeza‐Romero

François Gaie-Levrel

Ahmed Mahjoub

et al.

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Cited by 14 publications

(15 citation statements)

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“…-low-energy interactions of charged particles (electrons [1][2][3][4][5][6][7], protons [8], positrons [9]), and photons [10] with atoms and molecules of biological [1][2][3][4]7,8], astrochemical [10], industrial, and environmental [5,6,9] interest; -molecular evolution of astrochemical ices [11][12][13]; -planetary atmospheric physics [14]; -atmospheric pressure photoionization and fragmentation of organic and inorganic aerosols [15]; -processes and applications of atmospheric pressure plasmas in astrochemical [16,17] and biomedical fields [17,18].…”

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confidence: 99%

“…The article by Baeza-Romero et al proposed the use of a new instrument, a smog chamber in which a photoionization aerosol electron/ion spectrometer is coupled with VUV synchrotron radiation [15]. Organic aerosols are known to affect atmospheric processes significantly, and thus, human health.…”

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confidence: 99%

“…Organic aerosols are known to affect atmospheric processes significantly, and thus, human health. This newly developed instrument was tested for on-line analysis of these organic and inorganic/organic mixed aerosols [15]. Several interesting results were presented, for example, the ozonolysis of α-pinene and the uptake of glyoxal by ammonium sulfate [15].…”

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confidence: 99%

“…This newly developed instrument was tested for on-line analysis of these organic and inorganic/organic mixed aerosols [15]. Several interesting results were presented, for example, the ozonolysis of α-pinene and the uptake of glyoxal by ammonium sulfate [15]. The authors monitored the concentration of ozone in real time, together with particle size distribution and chemical composition.…”

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confidence: 99%

“…The authors monitored the concentration of ozone in real time, together with particle size distribution and chemical composition. They also discussed further improvement of this instrumentation [15].…”

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confidence: 99%

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Low-energy interactions related to atmospheric and extreme conditions

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This Topical Issue, entitled "Low-Energy Interactions Related to Atmospheric and Extreme Conditions", showcases a collection of eighteen articles that reported recent theoretical and experimental findings pertaining to the following topics:-low-energy interactions of charged particles (electrons [1-7] The contributed articles revealed that, in recent years, processes involving any kind of low-energy projectile (below a few keV) over a wide range of conditions have been recognized as important to many interdisciplinary research areas that span both the fundamental and applied sciences. For example, many studies on the topic of low-energy interactions (LEIs) have focused on probing gas or condensed phases under high-vacuum conditions. These studies model processes that can occur under physiological, industrial, atmospheric, or extreme conditions, the latter of which represent those that experience high levels of radiation in space. Therefore, this issue focuses on the most recent advances in the field of lowenergy processes, both at the fundamental and applied levels of elementary processes, and provides a state-of-theart description of current developments and discoveries. What follows is a brief summary of the most important conclusions derived from the collective findings. Over the last two decades, many LEI studies have focused on isolated biomolecules in the gas and condensed phases to understand and predict more accurately the reaction pathways and detailed mechanisms of damage to cellular components, such as DNA and proteins. In this issue,Śmia lek summarized and highlighted the pioneering work, together with the most prominent findings about DNA damage from an atomic and molecular physics perspective; this timely discussion contributes to a deeper understanding of the fundamental processes in cellular systems [7]. In her colloquium paper,Śmia lek also discussed experimental issues and challenges experienced in the precise estimation of cross sections for DNA damage [7]. Similarly, in another contributed article, Rackwitz et al. discussed the difficulties in establishing a reliable cross section for DNA damage, particularly strand breaks [3]. To overcome these challenges, the authors proposed a novel method to quantify absolute cross sections of strand breaks that low-energy electrons induce in oligonucleotides (synthesized, single-stranded DNA). Using this technique, oligonucleotides (with and without radiosensitizers) were supported on a DNA origami triangle and irradiated with 10 eV electrons. Thereafter, the cross sections of damage were determined based on the analysis of atomic force microscopic images [3].In addition toŚmia lek's summary of the current state of our understanding of DNA damage [7], other contributed articles reported recent experimental results for other biologically-important molecules, primarily amino

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Low-energy interactions related to atmospheric and extreme conditions

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The Distant Double Bond Determines the Fate of the Carboxylic Group in the Dissociative Photoionization of Oleic Acid

et al. 2017

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The valence threshold photoionization of oleic acid has been studied using synchrotron VUV radiation and imaging photoelectron photoion coincidence (iPEPICO) spectroscopy. An oleic acid aerosol beam was impacted on a copper thermodesorber, heated to 130 °C, to evaporate the particles quantitatively. Upon threshold photoionization, oleic acid produces the intact parent ion first, followed by dehydration at higher energies. Starting at ca. 10 eV, a large number of fragment ions slowly rise suggesting several fragmentation coordinates with quasi-degenerate activation energies. However, water loss is the dominant low-energy dissociation channel, and it is shown to be closely related to the unsaturated carbon chain. In the lowest-barrier process, one of the four allylic hydrogen atoms is transferred to the carboxyl group to form the leaving water molecule and a cyclic ketone fragment ion. A statistical model to analyze the breakdown diagram and measured rate constants yields a 0 K appearance energy of 9.77 eV, which can be compared with the density functional theory result of 9.19 eV. Alternative H-transfer steps yielding a terminal C=O group are ruled out based on energetics and kinetics arguments. Some of the previous photoionization mass spectrometric studies also reported 2 amu and 26 amu loss fragment ions, corresponding to hydrogen and acetylene loss. We could not identify such peaks in the mass spectrum of oleic acid.

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Experimental study on synchrotron radiation photoionization of secondary organic aerosol derived from styrene ozonolysis

Huang

Wang

Shan

et al. 2023

J Chinese Chemical Soc

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Secondary organic aerosol (SOA) produced by ozonolysis of styrene and other alkene compounds is a major part of fine particles in urban atmospheres. The atmospheric ozonolysis process of styrene is simulated in a smog chamber, and the formed SOA particles are detected on-line by a synchronous radiation vacuum ultraviolet photoionization mass spectrometer (VUV-PIMS) in this study. Through molecular ion peaks in the photonionization mass spectra of SOA and the corresponding photoionization efficiency curve, combined with off-line measurement verification of ultraviolet visible and infrared absorption spectra, it is determined that formaldehyde, formic acid, benzene, phenol, benzaldehyde, and benzoic acid are the main constituents of styrene SOA. These provide new information for studying the atmospheric ozonolysis oxidation mechanism of styrene. VUV-PIMS can get over complicated sample preparation procedures, secondary pollution, and other shortcomings of the off-line method and is a useful instrument to measure constituents and unveil the formation process of SOA particles.

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A smog chamber study coupling a photoionization aerosol electron/ion spectrometer to VUV synchrotron radiation: organic and inorganic-organic mixed aerosol analysis

Cited by 14 publications

References 48 publications

Low-energy interactions related to atmospheric and extreme conditions

Low-energy interactions related to atmospheric and extreme conditions

The Distant Double Bond Determines the Fate of the Carboxylic Group in the Dissociative Photoionization of Oleic Acid

Experimental study on synchrotron radiation photoionization of secondary organic aerosol derived from styrene ozonolysis

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