Author: Jonathan O. Allen
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 190
Book Description
The Analysis of Aerosol Time-of-flight Mass Spectrometry Data
Author: David Philip Fergenson
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 302
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 302
Book Description
Quantitative Analysis of Aerosol Time-of-flight Mass Spectrometry Data Using YAADA
Author: Jonathan O. Allen
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 190
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 190
Book Description
Using Aerosol Time-of-flight Mass Spectrometry (ATOFMS) Data to Gain New Insights Into the Temporal Profiles, Composition, and Evolution of Individual Particles in the Troposphere
Author: Don-Yuan Liu
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 608
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 608
Book Description
Aerosol Time-of-flight Mass Spectrometry (ATOFMS) as a Real-time Monitor of Individual Aerosol Particles in Field Studies
Author: Kimberly A. Prather
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 102
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 102
Book Description
Analysis of Atmospheric Aerosol Processes Using Single Particle Mass Spectrometry
Author: Jeffrey Robert Whiteaker
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 644
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 644
Book Description
Analysis Concepts Of Aerosols by On-Line Aerosol Mass Spectrometry
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
It is known that aerosols have an impact on climate, air quality and health. To better characterize these effects, the knowledge of the aerosol particle properties, such as size and chemical composition, at the individual level is needed. Toward this purpose, a Single Particle Aerosol Laser Mass Spectrometer (SPALMS) has been designed and developed to characterize in details the organic fraction of particles. The instrument samples the aerosol with a nozzle system and sizes particles individually by laser velocimetry. The single particle constituents are then volatilized (desorption) and ionized (ionization) by laser. The resulting cations and anions are analyzed with a bipolar time-of-flight mass spectrometer. The resulting mass spectra provide a "fingerprint" of the particle composition. Thus the SPALMS instrument evaluates the mixing state, external versus internal, of the aerosol and allows the investigation of the chemical composition size dependency of the particles. The desorption and ionization steps are critical to obtain a good qualitative chemical analysis of the particle. Indeed many processes take place during these steps which fragment and alter the initial molecules in the particle. The simultaneous desorption and ionization with a single laser (337 nm) combined with a bipolar mass spectrometer is well suited for the analysis of mineral particles. On the other hand, organics in particles are better analyzed by operating first the constituents desorption with an infra-red laser (10.6 micrometers) and then the ionization shortly after with an ultra-violet laser (248 nm). Indeed molecules are softly ionized via a SPI or REMPI process. In this manner the resulting mass spectra are more representative of the particle composition since organics are less fragmented. As the SPALMS instrument involves many different measurement steps based of very different principles, it is equipped with many data acquisition devices (up to 12 channels) to record the correspo.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
It is known that aerosols have an impact on climate, air quality and health. To better characterize these effects, the knowledge of the aerosol particle properties, such as size and chemical composition, at the individual level is needed. Toward this purpose, a Single Particle Aerosol Laser Mass Spectrometer (SPALMS) has been designed and developed to characterize in details the organic fraction of particles. The instrument samples the aerosol with a nozzle system and sizes particles individually by laser velocimetry. The single particle constituents are then volatilized (desorption) and ionized (ionization) by laser. The resulting cations and anions are analyzed with a bipolar time-of-flight mass spectrometer. The resulting mass spectra provide a "fingerprint" of the particle composition. Thus the SPALMS instrument evaluates the mixing state, external versus internal, of the aerosol and allows the investigation of the chemical composition size dependency of the particles. The desorption and ionization steps are critical to obtain a good qualitative chemical analysis of the particle. Indeed many processes take place during these steps which fragment and alter the initial molecules in the particle. The simultaneous desorption and ionization with a single laser (337 nm) combined with a bipolar mass spectrometer is well suited for the analysis of mineral particles. On the other hand, organics in particles are better analyzed by operating first the constituents desorption with an infra-red laser (10.6 micrometers) and then the ionization shortly after with an ultra-violet laser (248 nm). Indeed molecules are softly ionized via a SPI or REMPI process. In this manner the resulting mass spectra are more representative of the particle composition since organics are less fragmented. As the SPALMS instrument involves many different measurement steps based of very different principles, it is equipped with many data acquisition devices (up to 12 channels) to record the correspo.
The Design and Construction of an Aerosol Time-of-flight Mass Spectrometer for Ambient Aerosol Analysis
Author: Trent Eric Nordmeyer
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 468
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 468
Book Description
Development, Characterization, and Refinement of a Transportable Aerosol Time-of-flight Mass Spectrometer
Author: Tas Dienes
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 400
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 400
Book Description
Further Development and Application of Laser Desorption Ionization (LDI) Using Aerosol Time-of-flight Mass Spectrometry (ATOFMS)
Author: Ryan Jay Wenzel
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 454
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 454
Book Description
Refinement, Calibration, and Field Studies Involving Transportable Aerosol Time-of-flight Mass Spectrometers
Author: Sylvia H. Pastor
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 396
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 396
Book Description