Zobrazeno 1 - 10
of 276
pro vyhledávání: '"H. Vehkamäki"'
Publikováno v:
Atmospheric Chemistry and Physics, Vol 23, Pp 5993-6009 (2023)
Kinetics of collision-sticking processes between vapor molecules and clusters of low-volatility compounds govern the initial steps of atmospheric new particle formation. Conventional non-interacting hard-sphere models underestimate the collision rate
Externí odkaz:
https://doaj.org/article/448ee5d4bb19414691dd94938b76800f
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 11155-11172 (2022)
Ion–dipole collisions can facilitate the formation of atmospheric aerosol particles and play an important role in their detection in chemical ionization mass spectrometers. Conventionally, analytical models, or simple parametrizations, have been us
Externí odkaz:
https://doaj.org/article/1f436703d8a34581a6b2effdb0c85d72
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 10099-10114 (2022)
Ice clouds can form at low and moderate supercooling through heterogeneous ice nucleation on atmospheric particles. Typically, the nucleation requires active sites with special chemical and physical properties, including surface topology and roughnes
Externí odkaz:
https://doaj.org/article/b2996d17f15b4bd49edbdebab1e4c23c
Autor:
D. Alfaouri, M. Passananti, T. Zanca, L. Ahonen, J. Kangasluoma, J. Kubečka, N. Myllys, H. Vehkamäki
Publikováno v:
Atmospheric Measurement Techniques, Vol 15, Pp 11-19 (2022)
Sulfuric acid and dimethylamine vapours in the atmosphere can form molecular clusters, which participate in new particle formation events. In this work, we have produced, measured, and identified clusters of sulfuric acid and dimethylamine using an e
Externí odkaz:
https://doaj.org/article/bcaa73bf0d0c40afaa22b8695c90d854
Autor:
S. Gani, L. Kohl, R. Baalbaki, F. Bianchi, T. M. Ruuskanen, O.-P. Siira, P. Paasonen, H. Vehkamäki
Publikováno v:
Geoscience Communication, Vol 4, Pp 507-516 (2021)
Authorship conflicts are a common occurrence in academic publishing, and they can have serious implications for the careers and well-being of the involved researchers as well as the collective success of research organizations. In addition to not inv
Externí odkaz:
https://doaj.org/article/48665db383b349bda091b8f1b87f4e2c
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 13227-13246 (2021)
The formation, properties, and lifetime of secondary organic aerosols in the atmosphere are largely determined by gas–particle partitioning coefficients of the participating organic vapours. Since these coefficients are often difficult to measure a
Externí odkaz:
https://doaj.org/article/bd2ee0a92c4a417f82b4e8caa8d14feb
Autor:
A. Shcherbacheva, T. Balehowsky, J. Kubečka, T. Olenius, T. Helin, H. Haario, M. Laine, T. Kurtén, H. Vehkamäki
Publikováno v:
Atmospheric Chemistry and Physics, Vol 20, Pp 15867-15906 (2020)
We address the problem of identifying the evaporation rates for neutral molecular clusters from synthetic (computer-simulated) cluster concentrations. We applied Bayesian parameter estimation using a Markov chain Monte Carlo (MCMC) algorithm to deter
Externí odkaz:
https://doaj.org/article/c1aaf3575fc341b8b61f7915b7718283
Publikováno v:
Atmospheric Measurement Techniques, Vol 13, Pp 3581-3593 (2020)
Identification of atmospheric molecular clusters and measurement of their concentrations by atmospheric pressure interface time-of-flight (APi-TOF) mass spectrometers may be affected by systematic error due to possible decomposition of clusters insid
Externí odkaz:
https://doaj.org/article/010c52732a2a4469970e9d25f896dc0b
Publikováno v:
Atmospheric Chemistry and Physics, Vol 19, Pp 13355-13366 (2019)
Collisions of molecules and clusters play a key role in determining the rate of atmospheric new particle formation and growth. Traditionally the statistics of these collisions are taken from kinetic gas theory assuming spherical noninteracting partic
Externí odkaz:
https://doaj.org/article/ddd9c46a40534214a9f20fc9d220e3cf
Autor:
E. Baranizadeh, B. N. Murphy, J. Julin, S. Falahat, C. L. Reddington, A. Arola, L. Ahlm, S. Mikkonen, C. Fountoukis, D. Patoulias, A. Minikin, T. Hamburger, A. Laaksonen, S. N. Pandis, H. Vehkamäki, K. E. J. Lehtinen, I. Riipinen
Publikováno v:
Geoscientific Model Development, Vol 9, Iss 8, Pp 2741-2754 (2016)
The particle formation scheme within PMCAMx-UF, a three-dimensional chemical transport model, was updated with particle formation rates for the ternary H2SO4–NH3–H2O pathway simulated by the Atmospheric Cluster Dynamics Code (ACDC) using quantum
Externí odkaz:
https://doaj.org/article/79001193701944bbbf6dc6f6d4ccefdc