1
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Halonen R, Neefjes I, Reischl B. Further cautionary tales on thermostatting in molecular dynamics: Energy equipartitioning and non-equilibrium processes in gas-phase simulations. J Chem Phys 2023; 158:2890473. [PMID: 37184012 DOI: 10.1063/5.0148013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 04/25/2023] [Indexed: 05/16/2023] Open
Abstract
Molecular dynamics (MD) simulations of gas-phase chemical reactions are typically carried out on a small number of molecules near thermal equilibrium by means of various thermostatting algorithms. Correct equipartitioning of kinetic energy among translations, rotations, and vibrations of the simulated reactants is critical for many processes occurring in the gas phase. As thermalizing collisions are infrequent in gas-phase simulations, the thermostat has to efficiently reach equipartitioning in the system during equilibration and maintain it throughout the actual simulation. Furthermore, in non-equilibrium simulations where heat is released locally, the action of the thermostat should not lead to unphysical changes in the overall dynamics of the system. Here, we explore issues related to both obtaining and maintaining thermal equilibrium in MD simulations of an exemplary ion-molecule dimerization reaction. We first compare the efficiency of global (Nosé-Hoover and Canonical Sampling through Velocity Rescaling) and local (Langevin) thermostats for equilibrating a system of flexible compounds and find that of these three only the Langevin thermostat achieves equipartition in a reasonable simulation time. We then study the effect of the unphysical removal of latent heat released during simulations involving multiple dimerization events. As the Langevin thermostat does not produce the correct dynamics in the free molecular regime, we only consider the commonly used Nosé-Hoover thermostat, which is shown to effectively cool down the reactants, leading to an overestimation of the dimerization rate. Our findings underscore the importance of thermostatting for the proper thermal initialization of gas-phase systems and the consequences of global thermostatting in non-equilibrium simulations.
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Affiliation(s)
- Roope Halonen
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Ivo Neefjes
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, Helsinki FI-00014, Finland
| | - Bernhard Reischl
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, Helsinki FI-00014, Finland
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2
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Cai R, Yin R, Yan C, Yang D, Deng C, Dada L, Kangasluoma J, Kontkanen J, Halonen R, Ma Y, Zhang X, Paasonen P, Petäjä T, Kerminen VM, Liu Y, Bianchi F, Zheng J, Wang L, Hao J, Smith JN, Donahue NM, Kulmala M, Worsnop DR, Jiang J. The missing base molecules in atmospheric acid-base nucleation. Natl Sci Rev 2022; 9:nwac137. [PMID: 36196118 PMCID: PMC9522409 DOI: 10.1093/nsr/nwac137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 07/06/2022] [Accepted: 07/08/2022] [Indexed: 11/30/2022] Open
Abstract
Transformation of low-volatility gaseous precursors to new particles affects aerosol number concentration, cloud formation and hence the climate. The clustering of acid and base molecules is a major mechanism driving fast nucleation and initial growth of new particles in the atmosphere. However, the acid–base cluster composition, measured using state-of-the-art mass spectrometers, cannot explain the measured high formation rate of new particles. Here we present strong evidence for the existence of base molecules such as amines in the smallest atmospheric sulfuric acid clusters prior to their detection by mass spectrometers. We demonstrate that forming (H2SO4)1(amine)1 is the rate-limiting step in atmospheric H2SO4-amine nucleation and the uptake of (H2SO4)1(amine)1 is a major pathway for the initial growth of H2SO4 clusters. The proposed mechanism is very consistent with measured new particle formation in urban Beijing, in which dimethylamine is the key base for H2SO4 nucleation while other bases such as ammonia may contribute to the growth of larger clusters. Our findings further underline the fact that strong amines, even at low concentrations and when undetected in the smallest clusters, can be crucial to particle formation in the planetary boundary layer.
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Affiliation(s)
- Runlong Cai
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing , 100084 , China
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
| | - Rujing Yin
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing , 100084 , China
| | - Chao Yan
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
- Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology , Beijing , 100029 , China
| | - Dongsen Yang
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology , Nanjing , 210044 , China
| | - Chenjuan Deng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing , 100084 , China
| | - Lubna Dada
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
- Laboratory of Atmospheric Chemistry, Paul Scherrer Institute , Villigen , 5232 , Switzerland
| | - Juha Kangasluoma
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
| | - Jenni Kontkanen
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
| | - Roope Halonen
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University , 135 Yaguan Road , Tianjin , 300350 , China
| | - Yan Ma
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology , Nanjing , 210044 , China
| | - Xiuhui Zhang
- Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology , Beijing , 100081 , China
| | - Pauli Paasonen
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
| | - Tuukka Petäjä
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
| | - Veli-Matti Kerminen
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
| | - Yongchun Liu
- Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology , Beijing , 100029 , China
| | - Federico Bianchi
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
| | - Jun Zheng
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology , Nanjing , 210044 , China
| | - Lin Wang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University , Shanghai , 200433 , China
| | - Jiming Hao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing , 100084 , China
| | - James N Smith
- Chemistry Department, University of California , Irvine , CA 92697 , USA
| | - Neil M Donahue
- Center for Atmospheric Particle Studies, Carnegie Mellon University , Pittsburgh , PA 15213 , USA
- Department of Chemistry, Carnegie Mellon University , Pittsburgh , PA 15213 , USA
| | - Markku Kulmala
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
| | - Douglas R Worsnop
- Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki , Helsinki , 00014 , Finland
- Aerodyne Research Inc., Billerica , MA , MA 01821 , USA
| | - Jingkun Jiang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University , Beijing , 100084 , China
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3
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Niman JW, Kamerin BS, Kresin VV, Krohn J, Signorell R, Halonen R, Hansen K. Shells in CO 2 clusters. Phys Chem Chem Phys 2022; 24:5343-5350. [PMID: 35191436 DOI: 10.1039/d1cp05866e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abundance spectra of (CO2)N clusters up to N ≈ 500 acquired under a wide range of adiabatic expansion conditions are analyzed within the evaporative ensemble framework. The analysis reveals that the cluster stability functions display a strikingly universal pattern for all expansion conditions. These patterns reflect the inherent properties of individual clusters. From this analysis the size-dependent cluster binding energies are determined, shell and subshell closing sizes are identified, and cuboctahedral packing ordering for sizes above N ≈ 130 is confirmed. It is demonstrated that a few percent variation in the dissociation energies translates into significant abundance variations, especially for the larger clusters.
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Affiliation(s)
- John W Niman
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA
| | - Benjamin S Kamerin
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA
| | - Vitaly V Kresin
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA
| | - Jan Krohn
- Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog Weg 2, CH-8093 Zürich, Switzerland
| | - Ruth Signorell
- Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog Weg 2, CH-8093 Zürich, Switzerland
| | - Roope Halonen
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Klavs Hansen
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China.,Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.
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4
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Dingilian K, Lippe M, Kubečka J, Krohn J, Li C, Halonen R, Keshavarz F, Reischl B, Kurtén T, Vehkamäki H, Signorell R, Wyslouzil BE. New Particle Formation from the Vapor Phase: From Barrier-Controlled Nucleation to the Collisional Limit. J Phys Chem Lett 2021; 12:4593-4599. [PMID: 33971093 PMCID: PMC8154860 DOI: 10.1021/acs.jpclett.1c00762] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 04/19/2021] [Indexed: 06/12/2023]
Abstract
Studies of vapor phase nucleation have largely been restricted to one of two limiting cases-nucleation controlled by a substantial free energy barrier or the collisional limit where the barrier is negligible. For weakly bound systems, exploring the transition between these regimes has been an experimental challenge, and how nucleation evolves in this transition remains an open question. We overcome these limitations by combining complementary Laval expansion experiments, providing new particle formation data for carbon dioxide over a uniquely broad range of conditions. Our experimental data together with a kinetic model using rate constants from high-level quantum chemical calculations provide a comprehensive picture of new particle formation as nucleation transitions from a barrier-dominated process to the collisional limit.
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Affiliation(s)
- Kayane
K. Dingilian
- William
G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - Martina Lippe
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir-Prelog-Weg2, 8093 Zürich, Switzerland
| | - Jakub Kubečka
- Institute
for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - Jan Krohn
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir-Prelog-Weg2, 8093 Zürich, Switzerland
| | - Chenxi Li
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir-Prelog-Weg2, 8093 Zürich, Switzerland
| | - Roope Halonen
- Institute
for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - Fatemeh Keshavarz
- Institute
for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - Bernhard Reischl
- Institute
for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - Theo Kurtén
- Department
of Chemistry, Faculty of Science, University
of Helsinki, FI-00014 Helsinki, Finland
| | - Hanna Vehkamäki
- Institute
for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
| | - Ruth Signorell
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir-Prelog-Weg2, 8093 Zürich, Switzerland
| | - Barbara E. Wyslouzil
- William
G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, United States
- Department
of Chemistry and Biochemistry, The Ohio
State University, Columbus, Ohio 43210, United States
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5
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Halonen R, Tikkanen V, Reischl B, Dingilian KK, Wyslouzil BE, Vehkamäki H. Homogeneous nucleation of carbon dioxide in supersonic nozzles II: molecular dynamics simulations and properties of nucleating clusters. Phys Chem Chem Phys 2021; 23:4517-4529. [PMID: 33595558 DOI: 10.1039/d0cp05653g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Large scale molecular dynamics simulations of the homogeneous nucleation of carbon dioxide in an argon atmosphere were carried out at temperatures between 75 and 105 K. Extensive analyses of the nucleating clusters' structural and energetic properties were performed to quantify these details for the supersonic nozzle experiments described in the first part of this series [Dingilian et al., Phys. Chem. Chem. Phys., 2020, 22, 19282-19298]. We studied ten different combinations of temperature and vapour pressure, leading to nucleation rates of 1023-1025 cm-3 s-1. Nucleating clusters possess significant excess energy from monomer capture, and the observed cluster temperatures during nucleation - on both sides of the critical cluster size - are higher than that of the carrier gas. Despite strong undercooling with respect to the triple point, most clusters are clearly liquid-like during the nucleation stage. Only at the lowest simulation temperatures and vapour densities, clusters containing over 100 molecules are able to undergo a second phase transition to a crystalline solid. The formation free energies retrieved from the molecular dynamics simulations were used to improve the classical nucleation theory by introducing a Tolman-like term into the classical liquid-drop model expression for the formation free energy. This simulation-based theory predicts the simulated nucleation rates perfectly, and improves the prediction of the experimental rates compared to self-consistent classical nucleation theory.
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Affiliation(s)
- Roope Halonen
- Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014, Helsinki, Finland.
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6
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Dingilian KK, Halonen R, Tikkanen V, Reischl B, Vehkamäki H, Wyslouzil BE. Homogeneous nucleation of carbon dioxide in supersonic nozzles I: experiments and classical theories. Phys Chem Chem Phys 2020; 22:19282-19298. [PMID: 32815933 DOI: 10.1039/d0cp02279a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We studied the homogeneous nucleation of carbon dioxide in the carrier gas argon for concentrations of CO2 ranging from 2 to 39 mole percent using three experimental methods. Position-resolved pressure trace measurements (PTM) determined that the onset of nucleation occurred at temperatures between 75 and 92 K with corresponding CO2 partial pressures of 39 to 793 Pa. Small angle X-ray scattering (SAXS) measurements provided particle size distributions and aerosol number densities. Number densities of approximately 1012 cm-3, and characteristic times ranging from 6 to 13 μs, resulted in measured nucleation rates on the order of 5 × 1017 cm-3 s-1, values that are consistent with other nucleation rate measurements in supersonic nozzles. Finally, we used Fourier transform infrared (FTIR) spectroscopy to identify that the condensed CO2 particles were crystalline cubic solids with either sharp or rounded corners. Molecular dynamics simulations, however, suggest that CO2 forms liquid-like critical clusters before transitioning to the solid phase. Furthermore, the critical clusters are not in thermal equilibrium with the carrier gas. Comparisons with nucleation theories were therefore made assuming liquid-like critical clusters and incorporating non-isothermal correction factors.
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Affiliation(s)
- Kayane K Dingilian
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA.
| | - Roope Halonen
- Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014, Helsinki, Finland
| | - Valtteri Tikkanen
- Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014, Helsinki, Finland
| | - Bernhard Reischl
- Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014, Helsinki, Finland
| | - Hanna Vehkamäki
- Institute for Atmospheric and Earth System Research/Physics, University of Helsinki, P.O. Box 64, FI-00014, Helsinki, Finland
| | - Barbara E Wyslouzil
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA. and Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA
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7
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Halonen R, Kuula L, Lahti J, Makkonen T, Räikkönen K, Pesonen AK. BDNF genotype moderates the impact of sleep characteristics on overnight visual learning. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Pesonen AK, Makkonen T, Halonen R, Elovainio M, Kuula L. Presleep cortisol level associates with higher cortical arousal in REM and NREM sleep. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Halonen R, Zapadinsky E, Vehkamäki H. Deviation from equilibrium conditions in molecular dynamic simulations of homogeneous nucleation. J Chem Phys 2018; 148:164508. [PMID: 29716220 DOI: 10.1063/1.5023304] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We present a comparison between Monte Carlo (MC) results for homogeneous vapour-liquid nucleation of Lennard-Jones clusters and previously published values from molecular dynamics (MD) simulations. Both the MC and MD methods sample real cluster configuration distributions. In the MD simulations, the extent of the temperature fluctuation is usually controlled with an artificial thermostat rather than with more realistic carrier gas. In this study, not only a primarily velocity scaling thermostat is considered, but also Nosé-Hoover, Berendsen, and stochastic Langevin thermostat methods are covered. The nucleation rates based on a kinetic scheme and the canonical MC calculation serve as a point of reference since they by definition describe an equilibrated system. The studied temperature range is from T = 0.3 to 0.65 ϵ/k. The kinetic scheme reproduces well the isothermal nucleation rates obtained by Wedekind et al. [J. Chem. Phys. 127, 064501 (2007)] using MD simulations with carrier gas. The nucleation rates obtained by artificially thermostatted MD simulations are consistently lower than the reference nucleation rates based on MC calculations. The discrepancy increases up to several orders of magnitude when the density of the nucleating vapour decreases. At low temperatures, the difference to the MC-based reference nucleation rates in some cases exceeds the maximal nonisothermal effect predicted by classical theory of Feder et al. [Adv. Phys. 15, 111 (1966)].
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Affiliation(s)
- Roope Halonen
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
| | - Evgeni Zapadinsky
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
| | - Hanna Vehkamäki
- Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
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10
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Kuula L, Merikanto I, Makkonen T, Halonen R, Lahti M, Lahti J, Heinonen K, Räikkönen K, Pesonen AK. Schizotypal traits are associated with sleep spindles and REM in adolescence. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Merikanto I, Kuula L, Makkonen T, Bódizs R, Halonen R, Heinonen K, Lahti J, Räikkönen K, Pesonen AK. Morningness is associated with lower sleep spindle amplitudes and intensities during adolescence. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Xie HB, Elm J, Halonen R, Myllys N, Kurtén T, Kulmala M, Vehkamäki H. Atmospheric Fate of Monoethanolamine: Enhancing New Particle Formation of Sulfuric Acid as an Important Removal Process. Environ Sci Technol 2017; 51:8422-8431. [PMID: 28651044 DOI: 10.1021/acs.est.7b02294] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Monoethanolamine (MEA), a potential atmospheric pollutant from the capture unit of a leading CO2 capture technology, could be removed by participating H2SO4-based new particle formation (NPF) as simple amines. Here we evaluated the enhancing potential of MEA on H2SO4-based NPF by examining the formation of molecular clusters of MEA and H2SO4 using combined quantum chemistry calculations and kinetics modeling. The results indicate that MEA at the parts per trillion (ppt) level can enhance H2SO4-based NPF. The enhancing potential of MEA is less than that of dimethylamine (DMA), one of the strongest enhancing agents, and much greater than methylamine (MA), in contrast to the order suggested solely by their basicity (MEA < MA < DMA). The unexpectedly high enhancing potential is attributed to the role of -OH of MEA in increasing cluster binding free energies by acting as both a hydrogen bond donor and acceptor. After the initial formation of one H2SO4 and one MEA cluster, the cluster growth mainly proceeds by first adding one H2SO4, and then one MEA, which differs from growth pathways in H2SO4-DMA and H2SO4-MA systems. Importantly, the effective removal rate of MEA due to participation in NPF is comparable to that of oxidation by hydroxyl radicals at 278.15 K, indicating NPF as an important sink for MEA.
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Affiliation(s)
- Hong-Bin Xie
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
- Department of Physics, University of Helsinki , P.O. Box 64, FIN-00014 Helsinki, Finland
| | - Jonas Elm
- Department of Physics, University of Helsinki , P.O. Box 64, FIN-00014 Helsinki, Finland
| | - Roope Halonen
- Department of Physics, University of Helsinki , P.O. Box 64, FIN-00014 Helsinki, Finland
| | - Nanna Myllys
- Department of Physics, University of Helsinki , P.O. Box 64, FIN-00014 Helsinki, Finland
| | - Theo Kurtén
- Department of Chemistry, University of Helsinki , P.O. Box 55, FIN-00014 Helsinki, Finland
| | - Markku Kulmala
- Department of Physics, University of Helsinki , P.O. Box 64, FIN-00014 Helsinki, Finland
| | - Hanna Vehkamäki
- Department of Physics, University of Helsinki , P.O. Box 64, FIN-00014 Helsinki, Finland
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13
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Elm J, Myllys N, Olenius T, Halonen R, Kurtén T, Vehkamäki H. Formation of atmospheric molecular clusters consisting of sulfuric acid and C8H12O6 tricarboxylic acid. Phys Chem Chem Phys 2017; 19:4877-4886. [DOI: 10.1039/c6cp08127d] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present the structures and thermochemical properties of (MBTCA)1−3(H2SO4)1−4 atmospheric molecular clusters.
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Affiliation(s)
- Jonas Elm
- Division of Atmospheric Sciences
- Department of Physics
- University of Helsinki
- FI-00014 Helsinki
- Finland
| | - Nanna Myllys
- Division of Atmospheric Sciences
- Department of Physics
- University of Helsinki
- FI-00014 Helsinki
- Finland
| | - Tinja Olenius
- Department of Environmental Science and Analytical Chemistry (ACES) and Bolin Centre for Climate Research
- Stockholm University
- 10691 Stockholm
- Sweden
| | - Roope Halonen
- Division of Atmospheric Sciences
- Department of Physics
- University of Helsinki
- FI-00014 Helsinki
- Finland
| | - Theo Kurtén
- Department of Chemistry
- University of Helsinki
- FI-00014 Helsinki
- Finland
| | - Hanna Vehkamäki
- Division of Atmospheric Sciences
- Department of Physics
- University of Helsinki
- FI-00014 Helsinki
- Finland
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14
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Partanen L, Vehkamäki H, Hansen K, Elm J, Henschel H, Kurtén T, Halonen R, Zapadinsky E. Effect of Conformers on Free Energies of Atmospheric Complexes. J Phys Chem A 2016; 120:8613-8624. [DOI: 10.1021/acs.jpca.6b04452] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lauri Partanen
- Laboratory
of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Finland
| | - Hanna Vehkamäki
- Department
of Physics, University of Helsinki, P.O. Box 64 (Gustaff Hällströmin
katu 2a), FIN-00014 University of Helsinki, Finland
| | - Klavs Hansen
- Tianjin
International Center of Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai district, Tianjin 300072, P. R. China
- Department
of Physics, University of Gothenburg, 41296 Gothenburg, Sweden
| | - Jonas Elm
- Department
of Physics, University of Helsinki, P.O. Box 64 (Gustaff Hällströmin
katu 2a), FIN-00014 University of Helsinki, Finland
| | - Henning Henschel
- Department
of Physics, University of Helsinki, P.O. Box 64 (Gustaff Hällströmin
katu 2a), FIN-00014 University of Helsinki, Finland
| | - Theo Kurtén
- Laboratory
of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Finland
| | - Roope Halonen
- Department
of Physics, University of Helsinki, P.O. Box 64 (Gustaff Hällströmin
katu 2a), FIN-00014 University of Helsinki, Finland
| | - Evgeni Zapadinsky
- Department
of Physics, University of Helsinki, P.O. Box 64 (Gustaff Hällströmin
katu 2a), FIN-00014 University of Helsinki, Finland
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Myllys N, Elm J, Halonen R, Kurtén T, Vehkamäki H. Coupled Cluster Evaluation of the Stability of Atmospheric Acid–Base Clusters with up to 10 Molecules. J Phys Chem A 2016; 120:621-30. [DOI: 10.1021/acs.jpca.5b09762] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nanna Myllys
- University of Helsinki, Department of Physics, FIN-00014 Helsinki, Finland
| | - Jonas Elm
- University of Helsinki, Department of Physics, FIN-00014 Helsinki, Finland
| | - Roope Halonen
- University of Helsinki, Department of Physics, FIN-00014 Helsinki, Finland
| | - Theo Kurtén
- University of Helsinki, Department of Chemistry, FIN-00014 Helsinki, Finland
| | - Hanna Vehkamäki
- University of Helsinki, Department of Physics, FIN-00014 Helsinki, Finland
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16
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Abstract
The aim of this study was to compare the measured and the calculated concentrations of indoor radon caused by building materials at 23 workplaces. The measured concentrations of radon were clearly higher than the calculated radon concentrations from the building materials, which indicated that the main source of indoor radon was the soil under and around the buildings. The highest means of continuously (933 Bq m(-3)) and integrated (169 Bq m(-3)) measured and calculated (from 70 to 169 Bq m(-3)) concentrations of radon were found in hillside locations. On the other hand, the median (27 and 43 Bq m(-3)) and maximum (626 and 1002 Bq m(-3)) values of calculated indoor radon concentrations exhaled from construction materials were the highest at the ground level places. On average, only 7-19% of the radon seemed to originate from the construction materials.
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Affiliation(s)
- P Korhonen
- Uusimaa Regional Institute of Occupational Health, Helsinki, Finland
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