  We report a solar jet phenomenon associated with the C5.4 class flare on 2014
November 11. The data of jet was provided by Solar Dynamics Observatory (SDO),
X-Ray Telescope (XRT) aboard Hinode, Interface Region Imaging Spectrograph
(IRIS) and Domeless Solar Telescope (DST) at Hida Observatory, Kyoto
University. These plentiful data enabled us to present this series of papers to
discuss the entire processes of the observed phenomena including the energy
storage, event trigger, and energy release. In this paper, we focus on the
energy release process of the observed jet, and mainly describe our spectral
analysis on the H-alpha data of DST to investigate the internal structure of
the H-alpha jet and its temporal evolution. This analysis reveals that in the
physical quantity distributions of the H-alpha jet, such as line-of-sight
velocity and optical thickness, there is a significant gradient in the
direction crossing the jet. We interpret this internal structure as the
consequence of the migration of energy release site, based on the idea of
ubiquitous reconnection. Moreover, by measuring the horizontal flow of the fine
structures in jet, we succeeded in deriving the three-dimensional velocity
field and the line-of-sight acceleration field of the H-alpha jet. The analysis
result indicates a part of ejecta in the H-alpha jet experienced the additional
acceleration after it had been ejected from the lower atmosphere. This
secondary acceleration was specified to occur in the vicinity of the
intersection between the trajectories of the H-alpha jet and X-ray jet observed
by Hinode/XRT. We propose that a fundamental cause of this phenomenon is the
magnetic reconnection involving the plasmoid in the observed jet.
