  We have performed time-dependent density functional theory simulations for
the neutralization process of a hydrogen ion injected at 100eV onto the (110)
surface of tungsten material. We have also proposed a method for evaluating the
detection probability of electrons in a small region. This probability is
interpreted as that of detecting hydrogen in each state: positive ion, neutral
atom, and negative ion. As a result, the probabilities of detecting hydrogen
after a collision as a positive ion, neutral atom, and negative ion were
approximately 30 percent, 50 percent, and 20 percent, respectively.
