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【简答题】
已知椭圆的中心是坐标原点O，焦点在x轴上，离心率为 2 2 ，又椭圆上任一点到两焦点的距离和为 2 2 ，过点M（0， - 1 3 ）与x轴不垂直的直线l交椭圆于P、Q两点． （1）求椭圆的方程； （2）在y轴上是否存在定点N，使以PQ为直径的圆恒过这个点？若存在，求出N的坐标，若不存在，说明理由．
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