Diffuse reflectance IR Fourier transform

Diffuse Reflectance IR Fourier Transform Spectroscopy (DRIFTS) can be employed with high surface area catalytic samples that are not sufficiently transparent to be studied in transmission. In this technique, the diffusely scattered IR radiation from a sample is collected, refocussed, and analysed. Samples can be measured in the form of loose powders. 

IR-transparent Cap2 crystal (d) diffuse reflectance IR Fourier transform spectrum of PDI self-assembled on 2-3.5pm-size Ag powder [45],... 

Diffuse-reflectance IR Fourier transform spectrometry (DRIFTS) is an effective way of directly obtaining IR spectra on powdered samples with a minimum of sample preparation.In addition to saving time in sample preparation, il permits conventional IR spectral data to be gathered on samples not appreciably altered from their original stale. The widespread use of diffuse-reflectance measurements had to await the general availability of F TIR instruments in the mid-107()s because tlie intensity of radiation reflected from powders is loo low to be measured at medium resolution and adequate signal-lo-noise ratios with dispersive instruments. 

Diffuse Reflectance IR Fourier Transform (DRIFT) Spectroscopy of Air Oxidation... 

Diffuse Reflection IR Fourier Transform Spectroscopy (DRIFT)... 

Two methods, diffuse reflectance IR Fourier transform spectroscopy (DRIFTS) and standard transmittance Fourier transform IR spectroscopy (FTIR), were compared to quantitatively determine the amoimts of silicon dioxide and phosphorous pentoxide in mixed water samples. For these studies a range of concentrations of each pure compound were prepared and IR spectra obtained on them. The spectra were analyzed in the regions of 750 to 820 cm for SiOi and 950 to 1050 cm for P2O5 chosen because their respective IR absorptions have minimal overlap in these regions. Using Beer s law plot program from the instrument, a Perkin Elmer 1000, standard curves were established for each compound and used to determine the amoimts of each compoimd in mixed samples. 

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