fit_tscan Intermediate Example¶

Intermediate usage example for fit_tscan utility. Yon can find example file from TRXASprefitpack-example fit_tscan subdirectory.

Go to osc sub directory of fit_tscan directory.
In osc sub directory, you can find example_osc_1.txt, example_osc_2.txt, example_osc_3.txt, example_osc_4.txt files. These examples are generated from Library example, fitting with time delay scan (model: sum of exponential decay and damped oscillation).

Finding oscillation component¶

Before fitting with oscillation, first find oscillation component.
Type fit_tscan -h Then it prints help message. You can find detailed description of arguments in the utility section of this document.
Type fit_tscan example_osc --num_file 4 --mode decay --irf g --fwhm_G 0.1 -t0 0 0 0 0 --tau 0.5 20 2000 --no_base -o decay --method_glb ampgo
After fitting process is finished, you can see both fitting result plot and report for fitting result in the console. Upper part of plot shows fitting curve and experimental data. Lower part of plot shows residual of fit (data-fit).
You can find oscillation feature in residual panel of time scan 1.

png png png png

Guessing initial lifetime and period for oscillation feature.
Type fit_tscan example_osc --num_file 4 --mode both --irf g --fwhm_G 0.1 -t0 0 0 0 0 --tau 0.5 10 1000 --tau_osc 1.5 --period_osc 0.5 --no_base -o osc --method_glb ampgo. In this example, we change fitting mode to both that is add convolution of damped oscillation and instrumental response function component. Moreover we set initial lifetime --tau_osc and period --period_osc for such component.
After fitting process is finished, you can see oscillation feature is well fited in residual panel of time scan 1.

png

phase_example_osc.txt contains phase factor of each oscillation component in each time delay scan
fit_decay_example_osc.txt contains decay part of fitting curve of time delay scan
fit_osc_example_osc.txt contains oscillation part of fitting curve of time delay scan