11. For a sinusoidal plane wave propagating along z axis the orbital angular momentum density vanishes. 12. It also has an odd parity and therefore odd orbital angular momentum " l ". 13. A related definition is to conceive orbital angular momentum as a " plane element ". 14. In this case C = L ^ 2, the square of the orbital angular momentum . 15. These modes have a singular phase profile and are eigenfunctions of the photon orbital angular momentum . 16. This orbital angular momentum of light can be observed in the orbiting motion of trapped particles. 17. In addition to this the electrons possess orbital angular momentum , as is characteristic of CNT electrons. 18. Simply-stated, it involves coupling of the electron spin with the orbital angular momentum of non-circular orbits. 19. "The bad news is that nobody knows a reliable way to measure the orbital angular momentum ," 20. So " 1s " means the lowest energy state where the electron has no orbital angular momentum .
