Comparing Results To Literature

[Lufter]

Hi,
I am new to the ARC package, and while reading through the documentation on using ARC to calculate the dipole matrix element of the Cesium D2 Transition 6S_{1/2}-->6P_{3/2}, I noticed that the value was not what I expected. For example,

ARC is showing that the dipole matrix element is <j||er||j'> = 6.334 ea_0, while the Steck's Cs D line note is suggesting <j||er||j'> = 4.4786(40) ea0. I feel I might have misunderstood how to correctly read the results from ARC.

I also noticed that there is a potential typo in the documentation,

The sign of $q$ should be the opposite

[nikolasibalic]

Hi @Lufter

Thank you for your question. Note that there are two definitions of reduced d.m.e. one that is symmetric in j, j', and the other one that is not. Notations for both are not universal so in each publication you need to double check.

In ARC we use < || > for symmetric, and ( || ) for asymmetric. In Steck notation is opositie. You can get both values from ARC calling getReducedMatrixElementJ and getReducedMatrixElementJ_asymmetric.

I hope that helps.

[Lufter]

Thank you!