Diffuse reflectance infrared Fourier transform spectrometry DRIFTS

The samples were characterized by X-ray diffraction (XRD) transmission and high-resolution electron microscopy (TEM and HREM) microelectrophoresis X-ray photoelectron spectroscopy (XPS), also known as electron spectroscopy for chemical analysis (ESCA) secondary ion mass spectrometry (SIMS) and diffuse reflectance Fourier transform (DRIFT) infrared absorption spectroscopy. 

Because of its highly discriminative capability, Fourier transform infrared (FTIR) spectrometry is valuable for identification of unknown compounds by comparison of sample spectra to reference spectra or by spectral interpretation (Somsen et al., 1995). IR spectra have been obtained on eluted samples or directly on TLC plates. About 5 pg is usually required for the elution method, which involves scraping of the zone and elution from the layer material onto an IR-transparent substance such as KBr (Issaq, 1983). Spectra can be measured directly on TLC plates by diffuse reflectance Fourier transform (DRIFT) IR spectrometry (Zuber et al, 1984). For in situ DRIFT-IR spectrometry, which requires 1-10 pg of compound, solvents must be removed from the layer and spectra corrected... 

The two examples below demonstrate further developments in SSITKA for investigating heterogeneous reactions. The group of Burch and Meunier at Queen s University Belfast developed a set-up combining in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and on-line mass spectrometry (MS) with... 

Tunstall,S.,Amarasiriwardena,D.(2002) Characterization of lead and lead leaching properties of lead glazed ceramics from the Solis Valley, Mexico, using inductively coupled plasma-mass spectrometry (ICP-MS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFT). Microchemical Journal, 73, 335-347. 

Diffuse Reflectance-. Diffuse reflectance, or diffuse reflectance infrared Fourier transform spectrometry (DRIFTS), exploits surface interactions and reflection. Although samples still are mixed with KBr, there is no need to press the mixture into a clear pellet. The technique is also more sensitive than traditional dispersive IR and requires less material than a pellet. The sample is mixed with KBr to create a dilute solid solution of reasonably uniform small crystal size. The mixture is placed in a small cup, and the IR beam is directed onto the surface, where... 

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