def __init__(self):
    self.position_nm = Point(0.0, 0.0, 0.0)
    self.direction = Point(0.0, 0.0, (- 1.0))
    self.kinetic_energy_keV = 6.0
    self.mass_amu = 39.962
    self.atomic_number = 18
def __init__(self):
    self.position_nm = Point(0.0, 0.0, 0.0)
    self.direction = Point(0.0, 0.0, (- 1.0))
    self.kinetic_energy_keV = 6.0
    self.mass_amu = 39.962
    self.atomic_number = 18