MATTSON TECHNOLOGY THIRD QUARTER EARNINGS CONFERENCE CALL TO BE HEARD LIVE ON WEBSITE

Fremont, Calif. — October 12, 2000—: Mattson Technology, (NASDAQ: MTSN), today announced that a conference call reviewing its third quarter fiscal 2000 results will be publicly available via the Internet beginning with a live webcast at 2:00 p.m. Pacific time, on Thursday, Oct. 19, 2000.

The webcast will be publicly available on Mattson's website at http://www.mattson.com. In addition to the live webcast, replays will be available to the public on Mattson's website through Thursday, Oct. 26, 2000, or users can call for a replay at 719 457 0820, pass code 827345 one hour after the conclusion of the teleconference.

About Mattson Technology

Mattson Technology Inc., is a leading supplier of thermal, plasma and wet semiconductor processing equipment. The company's products combine advanced process technology on a high productivity platform, backed by industry-leading support. Since beginning operations in 1989, the company's core vision has been to help bring technology leadership and productivity gains to semiconductor manufacturers worldwide. Headquartered in Fremont, Calif., the company maintains sales and support centers throughout the United States, Europe, Asia/Pacific and Japan. For more information, please contact Mattson Technology Inc., 2800 Bayview Drive, Fremont, Calif. 94538. Telephone: (800) MATTSON. Fax: (510) 657-0165. Internet:www.mattson.com