Dismissal of her petition may not give you any cause of action. however, you may consult your lawyer with your documents.

It depends on the order of the Court. If the Court has rendered unchallenged findings that your wife's allegations were false, then you can sue her for defamation and damages.

If petition was dismissed on technical grounds, then you cannot use the judgment to sue.

in case the petition was disposed off on merits, and you have ample proof that she lied on oath, you may take a legal action against her.