Concept information
Preferred term
PALMS
Definition
- Particle Analysis by Laser Mass Spectrometry (PALMS) is a laser ionization mass spectrometer which makes in-situ measurements of the chemical composition of individual aerosol particles. Aerosols are brought into a vacuum system and individual particles are detected by light scattered as they cross the beam of a continuous laser. The scattered light signal gives a rough indication of the size of the particle and provides a trigger for an excimer laser (193nm), which is pulsed so its beam hits the particle to ionize molecules and atoms. These ions are analyzed with a time of flight mass spectrometer to provide a complete mass spectrum from each particle. The instrument is capable of measuring particles from 0.2 to 3 microns in diameter. Analysis is complete less then 1 millisecond after the aerosols enter the inlet. The instrument can acquire either positive or negative ion spectra. (en)
Broader concept
URI
https://gcmd.earthdata.nasa.gov/kms/concept/a211773e-5959-40dc-8b33-f7d5880d57f3
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