function ret       = velocityDistributionFunction(this, velocity)
    ret =   sqrt(2 / pi) * (Helper.PhysicsConstants.Dy164Mass/(Helper.PhysicsConstants.BoltzmannConstant * this.OvenTemperatureinKelvin)) ...
          * velocity^3 * exp(-velocity^2.*(Helper.PhysicsConstants.Dy164Mass / (2 * Helper.PhysicsConstants.BoltzmannConstant ...
          * this.OvenTemperatureinKelvin)));
end