Factors Affecting the Spectral Response in a TG/FT-IR Experiment

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We discuss situations where thermogravimetric/Fourier transform infrared (TG/FT-IR) plots are obtained which differ substantially from the expected ones. The most common of these situations involves samples that release atmospheric components (H2O, CO2) at low temperatures. It is shown that the phenomena are mainly related to the purging action of the carrier gas, which strongly influences the spectroscopic portion of the TG/FT-IR plot. Such an influence, as well as the different situations originating from it, is discussed and explained on the basis of an analogy with the operational mode of a conventional dispersive spectrometer.

Keywords: Carrier gas purging action; Spectroscopic-thermogravimetric matching; TG/FT-IR

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702944027822

Affiliations: 1: Dipartimento di Chimica Fisica, Università di Pavia, Viale Taramelli 16, 27100 Pavia, Italy 2: Stazione Sperimentale per i Combustibili, Via A. De Gasperi 3, 20097 San Donato Milanese, Italy

Publication date: December 1, 1994

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