Projection on n quantum number

[NW]

Hello,

As I read on the following link, we can use Projection on l and m quantum numbers.
Is it possible to use projection function for n quantum number too (e.g. n_quantum_numbers=[5])?

https://docs.quantumatk.com/manual/Types/Projection/Projection.html

Thanks,

[Petr Khomyakov]

Please explain what is the meaning of this kind of projection.

[Anders Blom]

First of all, the main quantum number is quite confusing when we deal with pseudopotentials. But more importantly, n is just an enumeration quantum number, whereas what you typically want to achieve with projections is to study symmetries and similar, which is related to the (l,m) quantum numbers.