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Vinci
Data Processing & Analysis
Data File Types
Vinci generates two types of data files: Experiment and Analysis files. Both file types are created in ASCII format and can be identified by their extension and the associated icon.
Experiment files, also called raw data files, include all data and the experimental parameters of a specific measurement (monochromator settings, temperature, sample concentration, polarizer position; or modulation frequency in a lifetime measurement). Experiment files cannot be modified which ensures the authenticity of the experimental conditions for future data acquisition.
Analysis files are generated every time a mathematical operator is applied to an Experiment file.
Processing Data Files Using Math Operators
Data files can be combined and superimposed. Several mathematical operators can be applied to a file:
- Normalization of the y-axis at set points of the x-axis
- Reformatting of the x-axis
- Determination of the reciprocal
- Calculation of the area and of the median of a spectrum along with the higher-order moments; smoothing (average, median, Savitzky-Golay)
- Calculation of derivative of the n-order
- Conversion to wavenumbers
Arithmetic operations between two files include subtraction, addition, multiplication and division. Moreover, spectral correction can be applied to technical spectra, and spectra acquired on the same sample can be averaged. The <Undo> key in the toolbar allows reversing any mathematical operator applied to a data file.
Fitting Models for Time-Resolved Data
Time-resolved fluorescence data analysis is performed by comparing a model (decay time or rotational correlation time) with the acquired data using a Marquardt-Levenberg algorithm as the minimization routine for the χ2-function. The model that yields the lowest value for the χ2-function is chosen for the system. The analysis includes fitting routines for multiple decay times (exponential, non-exponential, lifetime distributions); rotational correlation times (isotropic, anisotropic, and hindered rotators); the display of time-resolved and phase- and modulation-resolved spectra.
Fitting Time-Resolved Data Using a User-Defined Model
Vinci allows for a user to input a custom analysis model and the custom equation is minimized using the experimental data for the χ2-function.
Simulation of Time-Resolved Data
Vinci analysis also includes a simulation routine that allows the user to simulate time-resolved fluorescence data. Customized frequency response of single, multiple- and non-exponential decays, as well as lifetime distributions can be generated based on user-defined inputs for the decay times and fractional contributions. Similarly, anisotropy decays for isotropic, anisotropic and hindered rotators can be simulated and visualized.