Alexey Adamov
A5048066605- Mass Spectrometry Techniques and Applications
- Atmospheric chemistry and aerosols
- Analytical Chemistry and Chromatography
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Analytical chemistry methods development
- Advanced Chemical Sensor Technologies
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Spectroscopy and Laser Applications
- Metabolomics and Mass Spectrometry Studies
- Ion-surface interactions and analysis
- nanoparticles nucleation surface interactions
- Chemical Thermodynamics and Molecular Structure
- Pesticide Residue Analysis and Safety
- Various Chemistry Research Topics
- Catalytic Processes in Materials Science
- Laser-induced spectroscopy and plasma
- Pharmacological Effects and Assays
- Crystallization and Solubility Studies
- Microfluidic and Capillary Electrophoresis Applications
- Analytical Chemistry and Sensors
- Toxic Organic Pollutants Impact
- Isotope Analysis in Ecology
- Nuclear Physics and Applications
National Research Nuclear University MEPhI
2004-2024
University of Helsinki
2005-2016
Helsinki Institute of Physics
2013-2016
Institute of Engineering Physics
2004
Nucleation of aerosol particles from trace atmospheric vapours is thought to provide up half global cloud condensation nuclei. Aerosols can cause a net cooling climate by scattering sunlight and leading smaller but more numerous droplets, which makes clouds brighter extends their lifetimes. Atmospheric aerosols derived human activities are have compensated for large fraction the warming caused greenhouse gases. However, despite its importance climate, nucleation poorly understood. Recently,...
Abstract About half of present-day cloud condensation nuclei originate from atmospheric nucleation, frequently appearing as a burst new particles near midday 1 . Atmospheric observations show that the growth rate often accelerates when diameter is between one and ten nanometres 2,3 In this critical size range, are most likely to be lost by coagulation with pre-existing 4 , thereby failing form typically 50 100 across. Sulfuric acid vapour involved in nucleation but too scarce explain...
Abstract Atmospheric aerosols and their effect on clouds are thought to be important for anthropogenic radiative forcing of the climate, yet remain poorly understood 1 . Globally, around half cloud condensation nuclei originate from nucleation atmospheric vapours 2 It is that sulfuric acid essential initiate most particle formation in atmosphere 3,4 , ions have a relatively minor role 5 Some laboratory studies, however, reported organic without intentional addition acid, although...
From neutral to new Many of the particles in troposphere are formed situ, but what fraction all tropospheric do they constitute and how exactly made? Bianchi et al. report results from a high-altitude research station. Roughly half were newly by condensation highly oxygenated multifunctional compounds. A combination laboratory results, field measurements, model calculations revealed that nucleation is more than 10 times faster ion-induced nucleation, particle growth rates size-dependent,...
Observations made in the CLOUD chamber at CERN illuminate atmospheric particle formation.
Abstract. As demonstrated in a number of investigations, gaseous sulfuric acid plays central role atmospheric aerosol formation. Using chemical ionization mass spectrometer the gas-phase and OH concentration were measured Hyytiälä, SMEAR II station, Southern Finland during 24 March to 28 June 2007. Clear diurnal cycles observed as well differences between new particle formation event days non-event days. Typically, daily maximum concentrations gas phase varied from 3×105 2×106 molec cm−3...
For atmospheric sulfuric acid (SA) concentrations the presence of dimethylamine (DMA) at mixing ratios several parts per trillion by volume can explain observed boundary layer new particle formation rates. However, concentration and molecular composition neutral (uncharged) clusters have not been reported so far due to lack suitable instrumentation. Here we report on experiments from Cosmics Leaving Outdoor Droplets chamber European Organization for Nuclear Research revealing particles...
Significance A mechanism for the formation of atmospheric aerosols via gas to particle conversion highly oxidized organic molecules is found be dominant aerosol process in preindustrial boundary layer over land. The inclusion this a global model raises baseline concentrations and could lead reduction 27% estimates anthropogenic radiative forcing.
Abstract The growth of freshly formed aerosol particles can be the bottleneck in their survival to cloud condensation nuclei. It is therefore crucial understand how grow atmosphere. Insufficient experimental data has impeded a profound understanding nano-particle under atmospheric conditions. Here we study CLOUD (Cosmics Leaving OUtdoors Droplets) chamber, starting from formation molecular clusters. We present measured rates at sub-3 nm sizes with different atmospherically relevant...
We investigated the nucleation of sulfuric acid together with two bases (ammonia and dimethylamine), at CLOUD chamber CERN. The chemical composition positive, negative, neutral clusters was studied using three Atmospheric Pressure interface-Time Of Flight (APi-TOF) mass spectrometers: were operated in positive negative mode to detect ions, while third equipped a nitrate ion ionization source allowing detection clusters. Taking into account possible fragmentation that can happen during...
Abstract In the present work, mechanisms of Atmospheric Pressure Chemical Ionisation (APCI) in air and positive polarity were studied for selected thiophenes (Thiophene – T, 2-Methylthiophene 2MT, 2,5-Dimethylthiophene 2,5DMT, Benzothiophene BT 2-Methylbenzothiophene 2MBT). Using Ion Mobility Spectrometry (IMS) IMS combined with Mass (IMS-MS) techniques, reduced ion mobilities ions formed via APCI determined as well their m/z structures. The ionisation mechanism was discussed limits...
Abstract Chemical standards for positive ion mode electrospray ionization mobility spectrometry/mass spectrometry (ESI(+)‐IMS/MS) are suggested. The low clustering tendency of tetraalkylammonium halides makes them ideal chemical ESI(+)‐IMS/MS. A homologous series these compounds forms a useful external standard instrument testing and resolution calibration an IMS instrument. Selected homologues or mixture can be used as in the analytical runs. Absolute relative reduced mobilities were...
Abstract An ion mobility spectrometer that can easily be installed as an intermediate component between a commercial triple‐quadrupole mass and its original atmospheric pressure ionization (API) sources was developed. The curtain gas from the is also used drift gas. design of allows reasonably fast installation (about 1 h), thus considered accessory spectrometer. module independently operated device when equipped with Faraday cup detector. tube consists inlet, desolvation, drift, extraction...
Abstract. This study presents the difference between oxidised organic compounds formed by α-pinene oxidation under various conditions in CLOUD environmental chamber: (1) pure ozonolysis (in presence of hydrogen as hydroxyl radical (OH) scavenger) and (2) OH (initiated nitrous acid (HONO) photolysis ultraviolet light) absence ozone. We discuss results from three Atmospheric Pressure interface Time-of-Flight (APi-TOF) mass spectrometers measuring simultaneously composition naturally charged...
Abstract Sulfuric acid is widely recognized as a very important substance driving atmospheric aerosol nucleation. Based on quantum chemical calculations it has been suggested that the quantitative detection of gas phase sulfuric (H 2 SO 4 ) by use Chemical Ionization Mass Spectrometry (CIMS) could be biased in presence amines such dimethylamine (DMA). An experiment (CLOUD7 campaign) was set up at CLOUD (Cosmics Leaving OUtdoor Droplets) chamber to investigate H CIMS atmospherically relevant...
This study demonstrates how positive ion atmospheric pressure photoionization-ion mobility spectrometry-mass spectrometry (APPI-IMS-MS) can be used to produce different ionic forms of an analy te and these separated. When hexane:toluene (9:1) is as a solvent, 2,6-di-tert-butylpyridine (2,6-DtBPyr) 2,6-di-tert-4-methylpyridine (2,6-DtB-4-MPyr) efficiently radical cations [M]+ protonated [M + H]+ molecules, whereas, when the sample solvent hexane, molecules are mainly formed. Interestingly,...
Ionized acetates were used as model compounds to describe gas-phase behavior of oxygen containing with respect their formation dimers in ion mobility spectrometry (IMS). The ions created using corona discharge at atmospheric pressure and separated a drift tube before analysis the by mass spectrometry. At ambient operational temperature our instrument, all studied formed dimers. Using homolog series n-alkyl-acetates, we found that collision cross section dimer was smaller than monomer same...
Abstract Negative corona discharge atmospheric pressure chemical ionization (APCI) was used to investigate phenols with varying numbers of tert ‐butyl groups using ion mobility spectrometry–mass spectrometry (IMS‐MS). The main characteristic observed for all the phenolic compounds deprotonated molecule [M–H] − . 2‐ ‐Butylphenol showed one peak in mass‐selected spectrum measured under nitrogen atmosphere. When air as a nebulizer gas an oxygen addition seen mass and, interestingly, this new...
This article presents the combination of an aspiration-type ion mobility spectrometer with a mass spectrometer. The interface between aspiration and was designed to allow for quick mounting onto Sciex API-300 triple quadrupole developed instrumentation is used gathering fundamental information on spectrometry. Performance instrument demonstrated using 2,6-di-tert-butyl pyridine dimethyl methylphosphonate.
Abstract. As demonstrated in a number of investigations, gaseous sulfuric acid plays central role atmospheric aerosol formation. Using chemical ionization mass spectrometer the gas-phase and OH concentration were measured Hyytiälä, SMEAR II station, Southern Finland during 24 March to 28 June 2007. Clear diurnal cycles observed as well differences between new particle formation event days non-event days. The typical daily maximum concentrations gas phase varied from 3·105 2·106 molec cm−3...
Negative polarity atmospheric pressure chemical ionization of selected chlorinated hydrocarbons (tetrachloromethane CCl4 and hexachloroethane C2Cl6, dichloromethane CH2Cl2, trichloromethane CHCl3, 1,1,1,2-tetrachloroethane 1,1,1,2-C2H2Cl4, 1,1,2,2-tetrachloroethane 1,1,2,2,-C2H2Cl4 1,1,2-trichloroethane 1,1,2-C2H3Cl3, 1,1,2-C2HCl3) was studied using ion mobility spectrometry (IMS) IMS combined with time-of-flight mass spectrometer (IMS-TOF MS) techniques, in the dry air at two different...