Chemical Meters/Analyzers
type: Concept

TDMA
type: Concept
change note: 2021-12-15 08:29:40.0 [tstevens] Insert Concept add broader relation (TDMA [fae09965-8500-4041-b2c8-fc9ada6c4682,835999] - Chemical Meters/Analyzers [3d25724b-832f-4a61-b0b2-4f2ccecdba94,827335]);
definition: SEADM’s Tandem Differential Mobility Analyzer (TDMA) enables to study a wide range of nano-aerosol processes by analyzing the change of electrical mobility experienced by the nanoparticles. Electrical mobility is a well-proved method to elucidate structural and size characteristics of ions, and has been successfully applied for the study of processes such as evaporation, condensation, chemical reactions, charge reduction (or charge evaporation), nucleation, etc. TDMA features the renowned DMAs first developed by SEADMs cofounder, Prof. Juan Fernandez de la Mora, from Yale, including an ultra-high resolution, high transmission parallel plate DMA (termed DMA P5 system) before the process chamber, and a suitably lighter cylindrical DMA (termed Half Mini) afterwards. The system produces particularly rich information when exploited to investigate molecular ions or small clusters, since particle diameter is in this case discrete, and a series of well defined peaks rather than a continuum mobility spectrum is obtained.
in scheme: instruments