Particle analysis by laser mass spectrometry (PALMS) studies of ice nuclei and other low number density particles

2006 ◽  
Vol 258 (1-3) ◽  
pp. 21-29 ◽  
Author(s):  
Daniel J. Cziczo ◽  
David S. Thomson ◽  
Thomas L. Thompson ◽  
Paul J. DeMott ◽  
Daniel M. Murphy
Keyword(s):  
Mass Spectrometry ◽  
Particle Analysis ◽  
Laser Mass Spectrometry ◽  
Number Density ◽  
Ice Nuclei

scholarly journals Particle Analysis by Laser Mass Spectrometry WB-57F Instrument Overview

2000 ◽  
Vol 33 (1-2) ◽  
pp. 153-169 ◽  
Author(s):  
David S. Thomson ◽  
Mike E. Schein ◽  
Daniel M. Murphy
Keyword(s):  
Mass Spectrometry ◽  
Particle Analysis ◽  
Laser Mass Spectrometry

Solid state chemical ionization for characterization of organic compounds by laser mass spectrometry

Talanta ◽  
1989 ◽  
Vol 36 (1-2) ◽  
pp. 117-124 ◽  
Author(s):  
Kesagapillai Balasanmugam ◽  
Somayajula Kasi Viswanadham ◽  
David M. Hercules
Keyword(s):  
Mass Spectrometry ◽  
Solid State ◽  
Organic Compounds ◽  
Chemical Ionization ◽  
Laser Mass Spectrometry ◽  
State Chemical

Nano- and Femtosecond Laser Mass Spectrometry of Organic Molecules and Cluster

2009 ◽  
Author(s):  
Osama Abdel Rahman ◽  
Jürgen Grotemeyer ◽  
Tetuso Iguchi ◽  
Kenichi Watanabe
Keyword(s):  
Mass Spectrometry ◽  
Femtosecond Laser ◽  
Organic Molecules ◽  
Laser Mass Spectrometry

scholarly journals Sensitivities of Lagrangian modelling of mid-latitude cirrus clouds to trajectory data quality

2015 ◽  
Vol 15 (13) ◽  
pp. 7429-7447 ◽  
Author(s):  
E. Kienast-Sjögren ◽  
A. K. Miltenberger ◽  
B. P. Luo ◽  
T. Peter
Keyword(s):  
Cooling Rate ◽  
Temporal Resolution ◽  
Vertical Velocity ◽  
Input Data ◽  
Temperature Fluctuations ◽  
Box Model ◽  
Specific Humidity ◽  
Number Density ◽  
Ice Nuclei ◽  
Nuclei Number

Abstract. Simulations of cirrus are subject to uncertainties in model physics and meteorological input data. Here we model cirrus clouds along air mass trajectories, whose extinction has been measured with an elastic backscatter lidar at Jungfraujoch research station in the Swiss Alps, with a microphysical stacked box model. The sensitivities of these simulations to input data uncertainties (trajectory resolution, unresolved vertical velocities, ice nuclei number density and upstream specific humidity) are investigated. Variations in the temporal resolution of the wind field data (COSMO-Model at 2.2 km resolution) between 20 s and 1 h have only a marginal impact on the trajectory path, while the representation of the vertical velocity variability and therefore the cooling rate distribution are significantly affected. A temporal resolution better than 5 min must be chosen in order to resolve cooling rates required to explain the measured extinction. A further increase in the temporal resolution improves the simulation results slightly. The close match between the modelled and observed extinction profile for high-resolution trajectories suggests that the cooling rate spectra calculated by the COSMO-2 model suffice on the selected day. The modelled cooling rate spectra are, however, characterized by significantly lower vertical velocity amplitudes than those found previously in some aircraft campaigns (SUCCESS, MACPEX). A climatological analysis of the vertical velocity amplitude in the Alpine region based on COSMO-2 analyses and balloon sounding data suggests large day-to-day variability in small-scale temperature fluctuations. This demonstrates the necessity to apply numerical weather prediction models with high spatial and temporal resolutions in cirrus modelling, whereas using climatological means for the amplitude of the unresolved air motions does generally not suffice. The box model simulations further suggest that uncertainties in the upstream specific humidity (± 10 % of the model prediction) and in the ice nuclei number density (0–100 L−1) are more important for the modelled cirrus cloud than the unresolved temperature fluctuations if temporally highly resolved trajectories are used. For the presented case the simulations are incompatible with ice nuclei number densities larger than 20 L−1 and insensitive to variations below this value.

Laser mass-spectrometry for online diagnosis of reactive plasmas with many species

2011 ◽  
Vol 82 (6) ◽  
pp. 063110 ◽  
Author(s):  
Chun-Lei Feng ◽  
Liang Gao ◽  
Jia-Hong Liu ◽  
Lei Zhang ◽  
Hongbin Ding
Keyword(s):  
Mass Spectrometry ◽  
Laser Mass Spectrometry
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