There is a software called RELIC.

But try your calculations by hand

first, calculate fexp by applying the standard formula. calculate the area of each absorption curve using Origin software.

then calculate fcal, using the value of reduced matrix elements of each transition. follow paper of WT Carnall.

then equate both fexp and fcal, you will get a set of equations (depending upon the number of transitions selected for calculations) with JO parameters and reduced elements on LHS and (Number)*10-20 on RHS.

Try to solve these equations. omega 2, omega 4 and omega 6 are variables in equations.

follow physics and chemistry of rare earth volume 25.

Thank you Mr Singh for your reply. Can you give some more details? Or introduce references with more details.

Harpreet Singh