Thermal desorption spectroscopy, water

While A

metal-water interactions are better probed by thermal desorption spectroscopy (TDS) in which heat is used to detach molecules from a surface. TDS data are in parallel with A (and AX) data. This is illustrated in Fig. 19.35 The spectrum of Ag(110) shows only one peak at 150 K, corresponding to ice sublimation. This means that Ag-H20 interactions are weaker than H20-H20 interactions (although they are still able to change the structure of the... 

Ag(lll) [4, 5]. According to the data of thermal desorption spectroscopy (TDS), the Ag-H20 interactions are weaker than H2O-H2O interactions, and the activity of Cu(llO) is higher than that of (111) and (100) faces. The M-H2O interactions are stronger on Cu than on Ag. A surface of Pt(lll) is more reactive than that of sd metals, but the high-temperature TDS peak for Pt(lll) is very close to that of Cu(llO). More complex spectra are exhibited by Ni(llO), which is known to be easily oxidized and thus tends to react strongly with water molecules [5, 74]. 

Benzene may be analyzed by several tech-niqnes, which include GC, MS, IR spectroscopy, and hydrocarbon analyzer. Its analysis at the ppb level in wastewater, groundwater, and potable water may be performed by a GC equipped with a photoionization detector and using the purge and trap or thermal desorption techniques. GC-FID may be employed to analyze benzene at ppm range. GC/MS is an excellent confirmatory test. Benzene may be identified by its primary characteristic ion with an m/z ratio of... 

Observations from the temperature-programmed desorption experiments suggest that molecules, e.g. water, may be transported through the bulk structure of the heteropoly oxometalates. Further evidence for such a possibility as well as for the thermal stability of the heteropoly oxometalates may be obtained from photoacoustic (PAS) FTIR spectroscopy... 

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