direct transfer gas flow system

in spectrochemical analysis
https://doi.org/10.1351/goldbook.D01775
A system in which the purge gas transports the analyte directly to the sampling or excitation sources.
Source:
PAC, 1992, 64, 261. (Nomenclature, symbols, units and their usage in spectrochemical analysis - XIII. Terms related to chemical vapour generation (IUPAC Recommendations 1992)) on page 263 [Terms] [Paper]