把带有阻尼项的4阶薛定谔方程写成标准的哈密尔顿系统,将该哈密尔顿系统分裂成2个哈密尔顿子系统.一个子系统是可分的,可以构造显式的辛格式;而另一个子系统由点点的质量守恒可以精确求解.这样得到的数值格式整体上是辛格式,而且避免了通常辛格式需要迭代的弊端,提高了计算效率.
The Schrodinger equation with trapped term is rewrited into standard Hamiltonian system,which is splitted into two subsystems.One of them is separable and explicit symplectic scheme can be constructed.Another can be solved exactly due to its pointwise mass conservation law.The whole scheme is explicit symplectic integrator.Therefore,no iterative is required and computational efficiency is improved.