Possible missing of a minus sign in calculating pair interaction(Question)

[JulietteGerald]

Hi,
thanks for your nice work and detailed documentation. This programm helps me greatly with my research.

When I was reading the source code on calculating the pair interaction, I think the programm may have missed a minus sign. According to the theory, the interaction term should read

(I directly snipped it from your paper.) There is a (-1)^{L_2} sign term in it. However, I did not find such term in your programm. (Also, the \sqrt{(2L_1+1)(2L_2+1)} seems to be missing as well, however, this term is by chance cancled out in calculating the dipole-dipole interaction .) I could be wrong, but still decided to raise this issue. What do you think?

best

Zihan

[nikolasibalic]

Hello Zihan @JulietteGerald ,

Thank you for taking time to notify me of this! I will have to remind myself of this part of the code and theory as I haven't looked into this for quite some time. I will do that this weekend, and let you know!

Best wishes,
Nikola

[JulietteGerald]

Hi Nikola, @nikolasibalic

Great! Take your time.

Best,
Zihan