F
Frank Helleis
Researcher at Max Planck Society
Publications - 31
Citations - 1029
Frank Helleis is an academic researcher from Max Planck Society. The author has contributed to research in topics: Mass spectrometry & Particle. The author has an hindex of 16, co-authored 30 publications receiving 853 citations. Previous affiliations of Frank Helleis include University of Chester.
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Journal ArticleDOI
Civil Aircraft for the regular investigation of the atmosphere based on an instrumented container: The new CARIBIC system
Carl A. M. Brenninkmeijer,Paul J. Crutzen,F. Boumard,T. Dauer,Barbara Dix,Ralf Ebinghaus,D. Filippi,Hubertus Fischer,Harald Franke,Udo Frieß,Jost Heintzenberg,Frank Helleis,M. Hermann,H. H. Kock,C. Koeppel,Jos Lelieveld,Markus Leuenberger,Bengt G. Martinsson,S. Miemczyk,H. P. Moret,Hung N. Nguyen,Peter Nyfeler,David E. Oram,Debbie O’Sullivan,Stuart A. Penkett,U. Platt,M. Pupek,M. Ramonet,B. Randa,M. . Reichelt,T. S. Rhee,J. Rohwer,K. Rosenfeld,D. Scharffe,Hans Schlager,Ulrich Schumann,Franz Slemr,Detlev Sprung,Paul Stock,R. Thaler,Francesco L. Valentino,P. F. J. van Velthoven,A. Waibel,A. Wandel,K. Waschitschek,Alfred Wiedensohler,Irène Xueref-Remy,Andreas Zahn,U. Zech,Helmut Ziereis +49 more
TL;DR: CARIBIC as mentioned in this paper is a flying observatory for the measurement of atmospheric gases and trace compounds onboard a Boeing 767-300 ER of LTU International Airways during long-distance flights from 1997 to 2002.
Journal ArticleDOI
Model Calculations of Aerosol Transmission and Infection Risk of COVID-19 in Indoor Environments.
Jos Lelieveld,Jos Lelieveld,Frank Helleis,Stephan Borrmann,Yafang Cheng,Frank Drewnick,Gerald H. Haug,Thomas Klimach,Jean Sciare,Jean Sciare,Hang Su,Ulrich Pöschl +11 more
TL;DR: It is suggested that aerosols from highly infective subjects can effectively transmit COVID-19 in indoor environments, and active room ventilation and the ubiquitous wearing of face masks may reduce the individual infection risk by a factor of five to ten, similar to high-volume, high-efficiency particulate air (HEPA) filtering.
Journal ArticleDOI
Particulate trimethylamine in the summertime Canadian high Arctic lower troposphere
Franziska Köllner,Franziska Köllner,Johannes Schneider,Megan D. Willis,Thomas Klimach,Frank Helleis,Heiko Bozem,Daniel Kunkel,Peter Hoor,Julia Burkart,W. Richard Leaitch,Amir A. Aliabadi,Amir A. Aliabadi,Jonathan P. D. Abbatt,Andreas Herber,Stephan Borrmann,Stephan Borrmann +16 more
TL;DR: In this paper, size-resolved and vertical profile measurements of single particle chemical composition (sampling altitude range 50-3000m) were conducted in the Canadian high Arctic during an aircraft-based measurement campaign (NETCARE 2014).
Journal ArticleDOI
Reactive uptake of ClONO2 on aqueous bromide solutions
TL;DR: In this article, the reactive uptake of ClNO2 on pure water, NaBr, and mixed NaBr/NaCl solutions was studied using a wetted wall flow tube equipped with a quadrupole mass spectrometer.
Journal ArticleDOI
Temperature-dependent rate constants and product branching ratios for the gas-phase reaction between methylperoxy and chlorine monoxide radicals
TL;DR: In this paper, the authors measured the reaction of CH 3 O 2 radicals with ClO in the temperature range 225-355 K using the discharge-flow /mass spectrometry technique.