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**1 - 2**of**2**### Angular momentum of light with plane phase front

"... We consider two different types of angular momentum of electromagnetic radiation. 1) Moment of linear momentum, which we consider as orbital angular momentum. 2) Spin, which is not a moment of momentum; its origin is a circular polarization. We show that a circularly polarized light beam with plane ..."

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We consider two different types of angular momentum of electromagnetic radiation. 1) Moment of linear momentum, which we consider as orbital angular momentum. 2) Spin, which is not a moment of momentum; its origin is a circular polarization. We show that a circularly polarized light beam with plane phase front carries angular momentum of both types, spin and orbital angular momentum, contrary to the standard electrodynamics. Because of the conservation laws of momentum and total angular momentum, spin and moment of momentum have concrete values. These two types of angular momentum are spatially separated. Flux of spin and flux of moment of momentum act on an absorber independently. An experiment is described, which can verify this supposition. Key words: Classical spin; optical torque; optical experiment

### Spin is not a moment of momentum

"... Unambiguous definitions of energy-momentum and spin tensors are cited. It is shown that moment of momentum (i.e. angular momentum) and spin are different concepts, but spin is absent in the modern classical electrodynamics. Nevertheless, angular momentum and spin of a rotating dipole radiation is ca ..."

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Unambiguous definitions of energy-momentum and spin tensors are cited. It is shown that moment of momentum (i.e. angular momentum) and spin are different concepts, but spin is absent in the modern classical electrodynamics. Nevertheless, angular momentum and spin of a rotating dipole radiation is calculated. We notice Jackson’s and Becker’s mistakes, which convinced them of the similarity between spin and angular momentum, and we show that the equality between these concepts is false. PACS numbers:75.10.Hk, 41.20.Jb