Then = n (f g ). In other words, the discrete Fourier transform maps convolution to pointwise multiplication.
Hamiltonian matrix is then calculated using the discrete Fast Fourier Transform method to compute the kinetic energy part of the operator.
The interaction of chitosan and indomethacin after impregnation was then studied by Fourier transform infrared (FTIR) and Raman spectroscopy, respectively.
This is recorded by a high sample rate oscilloscope and a fast Fourier transform (FFT) analysis is performed on the collected signal.
Additional species can be measured with portable Fourier transform infrared spectrometers.