Item 8.01. Other Events.

On January 20, 2009, Zygo Corporation ("Zygo") furnished written notice to Electro Scientific Industries, Inc. ("ESI") that Zygo's Board of Directors had withdrawn its recommendation in favor of adoption of the Agreement and Plan of Merger and Reorganization, dated as of October 15, 2008, by and among ESI, Zirkon Merger Sub, LLC and Zygo, as amended (the "Merger Agreement"). A copy of the notice of withdrawal is furnished as Exhibit 99.1 hereto. In addition, on January 20, 2009, Zygo issued a press release announcing that Zygo had notified ESI of the Zygo Board's withdrawal of its recommendation. The press release is furnished as Exhibit 99.2 hereto.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits. 99.1 Letter from Zygo to ESI, dated January 20, 2009, notifying ESI of withdrawal of recommendation by the Zygo Board. 99.2 Press Release, issued on January 20, 2009, entitled "Zygo Board Withdraws Recommendation in Favor of Electro Scientific Industries, Inc. Merger."

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