P-odd effects in transitions between hydrogen, potassium and cesium hyperfine-structure components

The E1-amplitude is calculated for transitions between the H, K and Cs hyperfine-structure components. For H this amplitude is induced by the V-A part of the electron-nucleon weak interaction. The K and Cs E1-transition is a result of the electron electro-magnetic interaction with the anapole moment of the nucleus. Possibility is discussed to make experiments using a hydrogen maser and magnetic cells with K and Cs vapour. It is shown that, with the line widths reached now in these cells, the experimental observation of the P-odd E1-amplitude in K and Cs becomes fairy real