http://en.wikipedia.org/wiki/En_passant
en-passant the complicated
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Whenever a pawn makes its two square move passing through a square attacked by an enemy pawn, that enemy pawn has the option to capture it in the next move, exactly the same way as if the pawn had move only one square. This can only happen in the imediate move after the advance.
It occurs allways among pawns, never among other pieces.
It is the only capture in chess in which the piece is not placed in the square of the captured piece.
I know little bitt about en passant IS EN PASSANT IS ONLY FOR PAWN CAPTURE.AND when a black pawn is in d3 and white Q move to d4 can the pawn capture the Q