30.1.54 ExpDecay2

Function

$y=y_0+A_1e^{-(x-x_0)/t_1}+A_2e^{-(x-x_0)/t_2}$

Two-phase exponential decay function with time offset, x0 should be fixed.

Number: 6

Names: y0, x0, A1, t1, A2, t2

Meanings: y0 = offset, x0 = center, A1 = amplitude, t1 = time constant, A2 = amplitude, t2 = time constant

Lower Bounds: none

Upper Bounds: none

Note: different initial parameters are used for t1 and t2 so as to make sure t2 > t1 in the fitting results.

nlf_expdecay2(x,y0,x0,A1,t1,A2,t2)

FITFUNC\EXPDECY2.FDF