These electrons of negative energy should be capable of producing coherent - elastic photon scattering .
The recoil momentum during absorption and emission of the photon is transferred to the total atom while the electrons remain in their state of negative energy .
These electrons of negative energy should be capable of producing coherent - elastic photon scattering because the recoil momentum during absorption and emission of the photon is transferred to the total atom while the electrons remain in their state of negative energy .