  The quaterionic formulation of quantum mechanics yields the unified quantum
wave equation (UQWEs). From these equations, Dirac, Klein - Gordon and
Schrodinger equations can be derived. While the UQWEs represent a matter wave
(de Broglie), the Maxwell equations represent a transverse wave (field). Owing
to UQWEs, the spin-0 and spin-1/2 particle are described by a wavepacket
consisting of waves traveling to the left and to the right with speed of light.
UQWEs show that spin-0 and spin-1/2 are in continuous states of creation and
annihilation that are compatible with Heisenberg uncertainty relation. The
creation - annihilation process is a result of the time translation property of
the particle wavefunction. These are $E'=E-im_0c^2$ and $E'=E\pm m_0c^2$, for
Klein-Gordon' and Dirac' particles, respectively. It is found that
$\frac{\hbar}{m_0c^2}$ is the period of the creation -annihilation process.
