Parameter Bound scheme

Static Spectrum fitting

• fwhm: broadening parameter

  • lower bound: 0.5*fwhm_init

  • upper bound: 2*fwhm_init

• peak_factor : parameter to shift or scale peak position

  • lower bound: 0.5*peak_factor_init

  • upper bound: 2*peak_factor_init

Time Delay fitting

Parameter bound scheme

• fwhm: temporal width of x-ray pulse

  • lower bound: 0.5*fwhm_init

  • upper bound: 2*fwhm_init

• t_0: timezero for each scan

  • lower bound: t_0 - 2*fwhm_init

  • upper bound: t_0 + 2*fwhm_init

• tau: life_time of each component

  • if tau < 0.1

    • lower bound: tau/2

    • upper bound: 1

  • if 0.1 < tau < 1

    • lower bound: 0.05

    • upper bound: 10

  • if 1 < tau < 10

    • lowe bound: 0.5

    • upper bound: 50

  • if 10 < tau < 100

    • lower bound: 5

    • upper bound: 500

  • if 100 < tau < 1000

    • lower bound: 50

    • upper bound: 2000

  • if 1000 < tau < 5000 then

    • lower bound: 500

    • upper bound: 10000

  • if 5000 < tau < 50000 then

    • lower bound: 2500

    • upper bound: 100000

  • if 50000 < tau < 500000 then

    • lower bound: 25000

    • upper bound: 1000000

  • if 500000 < tau < 1000000 then

    • lower bound: 250000

    • upper bound: 2000000

  • if 1000000 < tau then

    • lower bound: tau/4

    • upper bound: 4*tau