dads_svd

TRXASprefitpack.driver.dads_svd(escan_time: ndarray, fwhm: float, tau: ndarray, base: Optional[bool] = True, irf: Optional[str] = 'g', eta: Optional[float] = None, intensity: Optional[ndarray] = None, cond_num: Optional[float] = 0) → Tuple[ndarray, ndarray]

Calculate decay associated difference spectrum from experimental energy scan data (using svd)

Parameters

• escan_time – time delay for each energy scan data

• fwhm – full width at half maximum of instrumental response function

• tau – life time for each component

• base – whether or not include baseline [default: True]

• irf –

  shape of instrumental response function [default: g]

  • ’g’: normalized gaussian distribution,

  • ’c’: normalized cauchy distribution,

  • ’pv’: pseudo voigt profile \((1-\eta)g(t, {fwhm}) + \eta c(t, {fwhm})\)

• eta – mixing parameter for pseudo voigt profile (only needed for pseudo voigt profile)

• intensity – intensity of energy scan dataset

• cond_num – conditional number to turncate svd

Returns

Tuple of calculated decay associated difference spectrum of each component, and retrieved energy scan intensity from dads and decay components

Note

To calculate decay associated difference spectrum of n component exponential decay, you should measure at least n energy scan