Program overview

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The main window of R to DF shows the result of the KKR analysis, the obtained dielectric function of the material of interest:

The Objects menu item of the main window gives access to the following subwindows:

	Input spectrum: Intensity reflectance
	This window is used to define the intensity reflectance spectrum that is the input of the KKR analysis. This spectrum consists of three parts: The original measured reflectance spectrum framed by the low and high frequency extrapolations. The required data are set in the following subwindows:

	Experimental data
	Here the experimental data are imported and displayed.
	Low frequency extrapolation
	This subwindow is used to define the low frequency extrapolation. The user-defined data are displayed together with the experimental data such that the user can easily inspect the quality of the extrapolated curve.
	High frequency extrapolation
	Similar to the low frequency extrapolation, this window allows the settings for the high frequency end of the reflectance spectrum.
	Extrapolation thresholds
	This dialog is used to set the wavenumber thresholds where R to DF switches from the low frequency extrapolation to the measured data and from the measured data to the high frequency extrapolation.

	Response function in time domain
	This subwindow of the main window shows the response function in the time domain which is the intermediate and central quantity of the KKR analysis. In order to check the quality of the extrapolations it might be useful to inspect this function.
	Complex amplitude reflectance constructed by KKR
	This window shows the complex amplitdue reflection coefficient computed with the reconstructed phase.

	Dynamic conductivity computed from the dielectric function
	This window shows the complex dynamic conductivity constructed from the obtained dielectric function.

After all settings have been done by the user, the Do KKR command is used to compute the final result. Usually the obtained dielectric function is inspected, and the extrapolations are modified several times until a satisfying dielectric function is achieved. This can be exported to an ASCII text file with the Export command.
If you have to do the KKR analysis several times for similar input spectra you should save the configuration in a binary file with the File|Save As command. The recommended extension is .kkr . Later you can reload this configuration with File|Open whenever you have to solve a similar problem and re-use the current settings.
When R to DF is started it looks for a configuration called start.kkr in the folder of the executable program file. If such a file exists the program loads it as start configuration. If you want to you can replace this default configuration file by settings of your choice.