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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 837-839 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By the application of aerosol techniques for the deposition of well-defined particles of silver in combination with methane-based electron cyclotron resonance plasma etching, we have been able to fabricate nanometer sized columns of InP. Silver particles are produced via homogeneous nucleation out of silver vapor saturated nitrogen gas from a tube furnace at around 1100 °C and, after size selection, deposited on the surface of InP. Scanning electron microscope images show that equally sized particles of silver, with an effective diameter in the range 20–40 nm, can be generated and deposited on the semiconductor. In a dry etching process applied subsequently we transfer vertically the feature of the particles into the InP material underneath producing free-standing columns of InP with diameters as small as 50 nm.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-0662
    Keywords: Hygroscopic growth ; TDMA ; tandem differential mobility analyser ; aerosol particles ; cloud ; scavenging ; CCN
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The hygroscopic growth of individual aerosol particles has been measured with a Tandem Differential Mobility Analyser. The hygroscopic growth spectra were analysed in terms of diameter change with increasing RH from ≤20% to 85%. The measurements were carried out during the GCE cloud experiment at Kleiner Feldberg, Taunus, Germany in October and November 1990. Two groups of particles with different hygroscopic growth were observed. The less-hygroscopic group had average growth factors of 1.11, 1.04 and 1.02 for particle diameters of 50, 150 and 300 nm, respectively. The more-hygroscopic group had average growth factors of 1.34, 1.34, and 1.37 for the same particle diameters. The average fraction of less-hygroscopic particles was about 50%. Estimates of the soluble fractions of the particles belonging to the two groups are reported. Hygroscopic growth spectra for total aerosol, interstitial aerosol and cloud drop residuals were measured. A comparison of these hygroscopic growths of individual aerosol particles provides clear evidence for the importance of hygroscopic growth in nucleation scavenging. The measured scavenged fraction of particles as a function of diameter can be explained by the hygroscopic growth spectra.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 7 (1990), S. 250-255 
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The bipolar diffusion charging process is studied theoretically for aerosol particles in high purity argon and nitrogen. The Fuchs theory is extended by the incorporation of the free electron charging of the aerosol particles. The ion parameters for positive and negative ions are assumed to be identical. The influence of the free electrons explains the differences between the mean mobility and mean mass of negative and positive ions. The ratio of the electron number concentration to the number concentration of negative ions is used to fit the curves, calculated by the extended model, to the experimentally determined bipolar charge distribution in argon and nitrogen. The extended Fuchs model was found to be rather insensitive to variations in the mobility and mass compared with the model with four different ion parameters. Further experimental studies of the bipolar charge distribution in a gas mixture of pure nitrogen and sulfur hexafluoride, SF6, indicate the importance of the free electrons in the bipolar diffusion charging process.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2023-01-14
    Description: One year of hourly Particle Number Size Distribution (PNSD) measurements at three different location with different air masses. Different kinds of Mobility Particle Size Spectrometers, MPSS has been used for the measurements. --- Melpitz (2008), Central European background, Neo (2012), Clean Remote background Zeppelin (2010), Marine background --- Melpitz: Lat 51.53 deg, Long 12.93 deg Neo: Lat 36.83 deg, long 21.70 deg Zeppelin: lat 78.90, long 11.86 deg
    Keywords: DATE/TIME; Flag; Log-normal particle size distribution, normalized concentration at particle diameter 10.4 nm; Log-normal particle size distribution, normalized concentration at particle diameter 106.4 nm; Log-normal particle size distribution, normalized concentration at particle diameter 12.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 124.3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 14.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 145.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 16.5 nm; Log-normal particle size distribution, normalized concentration at particle diameter 169.5 nm; Log-normal particle size distribution, normalized concentration at particle diameter 19.3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 198 nm; Log-normal particle size distribution, normalized concentration at particle diameter 22.6 nm; Log-normal particle size distribution, normalized concentration at particle diameter 231.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 26.3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 270 nm; Log-normal particle size distribution, normalized concentration at particle diameter 3.5 nm; Log-normal particle size distribution, normalized concentration at particle diameter 30.8 nm; Log-normal particle size distribution, normalized concentration at particle diameter 315.3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 35.9 nm; Log-normal particle size distribution, normalized concentration at particle diameter 368.3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 4.1 nm; Log-normal particle size distribution, normalized concentration at particle diameter 4.8 nm; Log-normal particle size distribution, normalized concentration at particle diameter 42 nm; Log-normal particle size distribution, normalized concentration at particle diameter 430.1 nm; Log-normal particle size distribution, normalized concentration at particle diameter 49 nm; Log-normal particle size distribution, normalized concentration at particle diameter 5.6 nm; Log-normal particle size distribution, normalized concentration at particle diameter 502.3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 57.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 586.6 nm; Log-normal particle size distribution, normalized concentration at particle diameter 6.5 nm; Log-normal particle size distribution, normalized concentration at particle diameter 66.8 nm; Log-normal particle size distribution, normalized concentration at particle diameter 685 nm; Log-normal particle size distribution, normalized concentration at particle diameter 7.6 nm; Log-normal particle size distribution, normalized concentration at particle diameter 78 nm; Log-normal particle size distribution, normalized concentration at particle diameter 8.9 nm; Log-normal particle size distribution, normalized concentration at particle diameter 800 nm; Log-normal particle size distribution, normalized concentration at particle diameter 91.1 nm; Melpitz_obs; Particle Number Size Distribution (PNSD); Research station; RS
    Type: Dataset
    Format: text/tab-separated-values, 305228 data points
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  • 5
    Publication Date: 2023-01-14
    Description: One year of hourly Particle Number Size Distribution (PNSD) measurements at three different location with different air masses. Different kinds of Mobility Particle Size Spectrometers, MPSS has been used for the measurements. --- Melpitz (2008), Central European background, Neo (2012), Clean Remote background Zeppelin (2010), Marine background --- Melpitz: Lat 51.53 deg, Long 12.93 deg Neo: Lat 36.83 deg, long 21.70 deg Zeppelin: lat 78.90, long 11.86 deg
    Keywords: CAS; Cloud aerosol spectrometer; DATE/TIME; Flag; Log-normal particle size distribution, normalized concentration at particle diameter 108.24304 nm; Log-normal particle size distribution, normalized concentration at particle diameter 11.043329 nm; Log-normal particle size distribution, normalized concentration at particle diameter 119.53635 nm; Log-normal particle size distribution, normalized concentration at particle diameter 12.195511 nm; Log-normal particle size distribution, normalized concentration at particle diameter 13.467904 nm; Log-normal particle size distribution, normalized concentration at particle diameter 132.00792 nm; Log-normal particle size distribution, normalized concentration at particle diameter 14.873049 nm; Log-normal particle size distribution, normalized concentration at particle diameter 145.78069 nm; Log-normal particle size distribution, normalized concentration at particle diameter 16.424797 nm; Log-normal particle size distribution, normalized concentration at particle diameter 160.99041 nm; Log-normal particle size distribution, normalized concentration at particle diameter 177.787 nm; Log-normal particle size distribution, normalized concentration at particle diameter 18.138443 nm; Log-normal particle size distribution, normalized concentration at particle diameter 196.33603 nm; Log-normal particle size distribution, normalized concentration at particle diameter 20.030879 nm; Log-normal particle size distribution, normalized concentration at particle diameter 216.82033 nm; Log-normal particle size distribution, normalized concentration at particle diameter 22.120758 nm; Log-normal particle size distribution, normalized concentration at particle diameter 239.44182 nm; Log-normal particle size distribution, normalized concentration at particle diameter 24.42868 nm; Log-normal particle size distribution, normalized concentration at particle diameter 26.977394 nm; Log-normal particle size distribution, normalized concentration at particle diameter 264.42347 nm; Log-normal particle size distribution, normalized concentration at particle diameter 29.792023 nm; Log-normal particle size distribution, normalized concentration at particle diameter 292.01153 nm; Log-normal particle size distribution, normalized concentration at particle diameter 32.900311 nm; Log-normal particle size distribution, normalized concentration at particle diameter 322.47793 nm; Log-normal particle size distribution, normalized concentration at particle diameter 356.12298 nm; Log-normal particle size distribution, normalized concentration at particle diameter 36.332895 nm; Log-normal particle size distribution, normalized concentration at particle diameter 393.27831 nm; Log-normal particle size distribution, normalized concentration at particle diameter 40.12361 nm; Log-normal particle size distribution, normalized concentration at particle diameter 434.31017 nm; Log-normal particle size distribution, normalized concentration at particle diameter 44.309821 nm; Log-normal particle size distribution, normalized concentration at particle diameter 479.623 nm; Log-normal particle size distribution, normalized concentration at particle diameter 48.932792 nm; Log-normal particle size distribution, normalized concentration at particle diameter 529.66344 nm; Log-normal particle size distribution, normalized concentration at particle diameter 54.038091 nm; Log-normal particle size distribution, normalized concentration at particle diameter 584.92475 nm; Log-normal particle size distribution, normalized concentration at particle diameter 59.67604 nm; Log-normal particle size distribution, normalized concentration at particle diameter 645.95163 nm; Log-normal particle size distribution, normalized concentration at particle diameter 65.902213 nm; Log-normal particle size distribution, normalized concentration at particle diameter 713.34562 nm; Log-normal particle size distribution, normalized concentration at particle diameter 72.77798 nm; Log-normal particle size distribution, normalized concentration at particle diameter 787.77102 nm; Log-normal particle size distribution, normalized concentration at particle diameter 80.371116 nm; Log-normal particle size distribution, normalized concentration at particle diameter 88.756466 nm; Log-normal particle size distribution, normalized concentration at particle diameter 98.016683 nm; Neo_obs; Particle Number Size Distribution (PNSD)
    Type: Dataset
    Format: text/tab-separated-values, 355194 data points
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  • 6
    Publication Date: 2023-01-14
    Description: One year of hourly Particle Number Size Distribution (PNSD) measurements at three different location with different air masses. Different kinds of Mobility Particle Size Spectrometers, MPSS has been used for the measurements. --- Melpitz (2008), Central European background, Neo (2012), Clean Remote background Zeppelin (2010), Marine background --- Melpitz: Lat 51.53 deg, Long 12.93 deg Neo: Lat 36.83 deg, long 21.70 deg Zeppelin: lat 78.90, long 11.86 deg
    Keywords: AEROS; Aerosol sampler; DATE/TIME; Flag; Log-normal particle size distribution, normalized concentration at particle diameter 100 nm; Log-normal particle size distribution, normalized concentration at particle diameter 10 nm; Log-normal particle size distribution, normalized concentration at particle diameter 11.22 nm; Log-normal particle size distribution, normalized concentration at particle diameter 112.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 12.59 nm; Log-normal particle size distribution, normalized concentration at particle diameter 125.9 nm; Log-normal particle size distribution, normalized concentration at particle diameter 14.13 nm; Log-normal particle size distribution, normalized concentration at particle diameter 141.3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 15.85 nm; Log-normal particle size distribution, normalized concentration at particle diameter 158.5 nm; Log-normal particle size distribution, normalized concentration at particle diameter 17.78 nm; Log-normal particle size distribution, normalized concentration at particle diameter 177.8 nm; Log-normal particle size distribution, normalized concentration at particle diameter 19.95 nm; Log-normal particle size distribution, normalized concentration at particle diameter 199.5 nm; Log-normal particle size distribution, normalized concentration at particle diameter 22.39 nm; Log-normal particle size distribution, normalized concentration at particle diameter 223.9 nm; Log-normal particle size distribution, normalized concentration at particle diameter 25.12 nm; Log-normal particle size distribution, normalized concentration at particle diameter 251.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 28.18 nm; Log-normal particle size distribution, normalized concentration at particle diameter 281.8 nm; Log-normal particle size distribution, normalized concentration at particle diameter 31.62 nm; Log-normal particle size distribution, normalized concentration at particle diameter 316.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 35.48 nm; Log-normal particle size distribution, normalized concentration at particle diameter 354.8 nm; Log-normal particle size distribution, normalized concentration at particle diameter 39.81 nm; Log-normal particle size distribution, normalized concentration at particle diameter 398.1 nm; Log-normal particle size distribution, normalized concentration at particle diameter 44.67 nm; Log-normal particle size distribution, normalized concentration at particle diameter 446.7 nm; Log-normal particle size distribution, normalized concentration at particle diameter 50.12 nm; Log-normal particle size distribution, normalized concentration at particle diameter 501.2 nm; Log-normal particle size distribution, normalized concentration at particle diameter 56.23 nm; Log-normal particle size distribution, normalized concentration at particle diameter 562.3 nm; Log-normal particle size distribution, normalized concentration at particle diameter 63.1 nm; Log-normal particle size distribution, normalized concentration at particle diameter 631 nm; Log-normal particle size distribution, normalized concentration at particle diameter 70.79 nm; Log-normal particle size distribution, normalized concentration at particle diameter 707.9 nm; Log-normal particle size distribution, normalized concentration at particle diameter 79.43 nm; Log-normal particle size distribution, normalized concentration at particle diameter 89.13 nm; Particle Number Size Distribution (PNSD); Zeppelin_Observ
    Type: Dataset
    Format: text/tab-separated-values, 282588 data points
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  • 7
    Publication Date: 2023-01-30
    Description: Atmospheric aerosol measurements were conducted at the Melpitz observatory, Germany. The data was collected during 2012 to 2016, measured by Mobility Particle Size Spectrometer (T-MPSS).
    Keywords: Aerosol chemistry; Aerosol number concentration; Cloud Concensation Nuclei; DATE/TIME; Log-normal particle size distribution; Melpitz_obs; Mobility Particle Size Spectrometer (MPSS); Particle Number Size Distribution (PNSD); Research station; RS
    Type: Dataset
    Format: text/tab-separated-values, 5646816 data points
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  • 8
    Publication Date: 2023-07-11
    Description: Long-term measurements on aerosol activation characteristics help to understand the aerosol indirect effects (AIEs) and narrow down the uncertainties of AIEs simulation; however, they are still scarce. Atmospheric aerosol measurements were conducted at the Melpitz observatory (51.53°N, 12.93°E, 86 m above sea level), 50 km to the northeast of Leipzig, Germany. The aerosol particles observed at Melpitz can be regarded as representative for the central European rural background conditions. The data was collected during 2012 to 2016, including the measurements of monodosperse CCN, particle number size distribution, and aerosol chemical composition, which was measured by DMT-CCNC, T-MPSS, and ACSM & MAAP.
    Keywords: Aerosol chemistry; Cloud Concensation Nuclei; Particle Number Size Distribution (PNSD)
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 9
    Publication Date: 2023-07-11
    Description: Atmospheric aerosol measurements were conducted at the Melpitz observatory, Germany. The data was collected during 2012 to 2016, measured by Aerosol Chemical Speciation Monitor (ACSM) and Multi-angle absorption photometer (MAAP).
    Keywords: Aerosol Chemical Speciation Monitor (ACSM); Aerosol chemistry; Aerosols; Ammonium; Black carbon, aerosol; Calculated; Chloride; Cloud Concensation Nuclei; DATE/TIME; Hygroscopicity; Melpitz_obs; Multi-angle absorption photometer (MAAP); Nitrate; Organic matter; Particle Number Size Distribution (PNSD); Research station; RS; Sulfate
    Type: Dataset
    Format: text/tab-separated-values, 224351 data points
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  • 10
    Publication Date: 2023-12-02
    Description: Atmospheric aerosol measurements were conducted at the Melpitz observatory, Germany. The data was collected during 2012 to 2016, measured by Droplet Measurement Technologies Cloud Condensation Nucleus Counter (DMT-CCNC).
    Keywords: Aerosol chemistry; Aerosol number concentration; CCNC; Cloud Concensation Nuclei; Cloud condensation nuclei; Cloud Condensation Nuclei Counter; Condensation nuclei; Critical diameter; DATE/TIME; Hygroscopicity; Melpitz_obs; Number; Parameter; Particle Number Size Distribution (PNSD); Quotient; Research station; RS; Supersaturation
    Type: Dataset
    Format: text/tab-separated-values, 2732511 data points
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