S-state | Article about s-state by The Free Dictionary
A single-particle state whose orbital angular momentum quantum number is zero.
References in periodicals archive
As noted by Martin and Glauber , the polarization of the photon in S-state
orbital electron capture is also sensitive to the phase of the vector and axial-vector couplings in the low-energy interaction Hamiltonian  if the anti-neutrino is no longer assumed to be strictly right-handed.
Because the s-state
is asymmetric, for one of these fields the magnetization will reverse by rotating in the same direction throughout the sample.