‡Exhibit (a)(1)(F)

This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below). The Offer (as defined below) is made solely by the Offer to Purchase dated December 20, 2010 and the related Letter of Transmittal and any amendments or supplements thereto. Purchaser (as defined below) is not aware of any jurisdiction where the making of the Offer is prohibited by any administrative or judicial action pursuant to any valid state statute. If Purchaser becomes aware of any valid state statute prohibiting the making of the Offer or the acceptance of the Shares, Purchaser will make a good faith effort to comply with that state statute. If, after a good faith effort, Purchaser cannot comply with the state statute, the Offer will not be made to, nor will tenders be accepted from or on behalf of, the holders of Shares in that state. In any jurisdiction where the securities, blue sky or other laws require the Offer to be made by a licensed broker or dealer, the Offer will be deemed to be made on behalf of Purchaser or by one or more registered brokers or dealers licensed under the laws of such jurisdiction.

Notice of Offer to Purchase for Cash

All Outstanding Shares of Common Stock

of

Dionex Corporation

at

$118.50 Net Per Share

Pursuant to the Offer to Purchase Dated December 20, 2010

by

Weston D Merger Co.

an indirect wholly owned subsidiary of

Thermo Fisher Scientific Inc.

Weston D Merger Co., a Delaware corporation (“Purchaser”) and an indirect wholly owned subsidiary of Thermo Fisher Scientific Inc., a Delaware corporation (“Thermo Fisher”), is offering to purchase all outstanding shares of common stock, par value $0.001 per share (the “Shares”), of Dionex Corporation, a Delaware corporation (“Dionex”), at a purchase price of $118.50 per Share, net to the seller in cash, without interest and less any applicable withholding taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase dated December 20, 2010 (the “Offer to Purchase”) and in the related Letter of Transmittal (which, together with any amendments or supplements thereto, collectively constitute the “Offer”). Tendering stockholders whose Shares are registered in their names and who tender directly to American Stock Transfer & Trust Company (the “Depositary”) will not be charged brokerage fees or commissions or, except as set forth in Instruction 6 of the Letter of Transmittal, transfer taxes on the purchase of Shares pursuant to the Offer. Tendering stockholders whose Shares are registered in the name of their broker, bank or other nominee should consult such nominee to determine if any fees may apply. Following the consummation of the Offer, and subject to the conditions described in the Offer to Purchase, Purchaser intends to effect the Merger (as defined below).

THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, AT THE END OF WEDNESDAY, JANUARY 19, 2011, UNLESS THE OFFER IS EXTENDED.

The Offer is conditioned upon, among other things, (i) there being validly tendered in accordance with the terms of the Offer, prior to the expiration date of the Offer and not withdrawn, a number of Shares that, together with the Shares then owned by Thermo Fisher and/or Purchaser, represents at least a majority of the total number of Shares outstanding on a fully diluted basis (the “Minimum Condition”), (ii) expiration or termination of the applicable waiting period (and any extension thereof) under the Hart-Scott-Rodino Antitrust Improvement Act of 1976, as amended, and the regulations promulgated thereunder, and there having been obtained required or advisable foreign antitrust clearances (the “Antitrust Condition”). The Offer is also subject to the other conditions described in the Offer to Purchase.

The Offer is being made pursuant to an Agreement and Plan of Merger, dated as of December 12, 2010, among Thermo Fisher, Purchaser and Dionex (the “Merger Agreement”). The Merger Agreement provides, among other things, that after consummation of the Offer, Purchaser will merge with and into Dionex (the “Merger”), with Dionex continuing as the

surviving corporation and an indirect wholly owned subsidiary of Thermo Fisher. At the effective time of the Merger, each outstanding Share (other than any Shares held by Thermo Fisher, Purchaser, Dionex or any wholly owned subsidiary of Dionex, and any shares held by stockholders who validly exercise their appraisal rights in connection with the Merger) will be cancelled and extinguished and automatically converted into the right to receive the price per Share paid in the Offer (the “Offer Price”) without interest. The Merger Agreement is more fully described in Section 13 of the Offer to Purchase.

The Board of Directors of Dionex (the “Dionex Board”) has unanimously (i) determined that the Merger Agreement and the transactions contemplated by the Merger Agreement, including the Offer and the Merger, are advisable and in the best interests of Dionex’s stockholders and (ii) adopted the Merger Agreement and approved the transactions contemplated by the Merger Agreement, including the Offer and the Merger. The Dionex Board recommends that Dionex’s stockholders accept the Offer and tender their Shares in the Offer and (if required by Delaware law) adopt the Merger Agreement.

Upon the terms and subject to the conditions of the Offer (including, if the Offer is extended or amended, the terms and conditions of any extension or amendment), Purchaser will purchase, as promptly as practicable after the expiration of the Offer, all Shares validly tendered and not withdrawn prior to 12:00 Midnight, New York City time, at the end of Wednesday, January 19, 2011 (or any later time to which Purchaser, subject to the terms of the Merger Agreement, extends the period of time during which the Offer is open (the “Expiration Date”)). Purchaser (i) may, if any condition to the Offer is not satisfied or waived on any scheduled Expiration Date, extend the Expiration Date for an additional period or successive periods of up to ten business days each until all of the conditions are satisfied or waived, (ii) will extend the Offer for any period required by any applicable law, any interpretation or position of the SEC, the staff thereof or the NASDAQ Stock Market applicable to the Offer and, for periods of up to ten business days per extension, until the Antitrust Condition has been satisfied, and (iii) to the extent requested by Dionex, if any condition to the Offer is not satisfied or waived on any scheduled Expiration Date, will extend the Expiration Date for an additional period or successive periods of up to ten business days each until all of the conditions are satisfied or waived. Purchaser will not and has no obligation to extend the Expiration Date beyond June 12, 2011 unless, as of such date, all of the conditions to the Offer are satisfied other than the Antitrust Condition and the condition that Purchaser is not prohibited from consummating the Offer or the Merger by any applicable injunction or court order relating to antitrust or similar laws (and there is no pending action that would be reasonably expected to result in a prohibition), in which case such date will be extended by an additional 90 days.

Any extension, termination or amendment of the Offer will be followed as promptly as practicable by public announcement thereof to be made no later than 9:00 a.m., New York City time, on the next business day after the previously scheduled Expiration Date. During any extension of the Offer, all Shares previously tendered and not withdrawn will remain subject to the Offer and subject to the rights of a tendering stockholder to withdraw such stockholder’s Shares.

In accordance with Rule 14d-11 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and the Merger Agreement, Purchaser expressly reserves the right to provide, at its option, a subsequent offering period following the Expiration Date (a “Subsequent Offering Period”). If provided, a Subsequent Offering Period will be an additional period of time, following the expiration of the Offer and the purchase of Shares in the Offer, during which stockholders may tender any Shares not previously tendered in the Offer. If a Subsequent Offering Period is made available, (i) it will remain open for such period or periods as Purchaser will specify of at least three business days, (ii) Shares may be tendered in the same manner as was applicable to the Offer except that any Shares tendered may not be withdrawn, (iii) Purchaser will immediately accept and promptly pay for Shares as they are tendered and (iv) the price per Share will be the same as the Offer Price. Purchaser may extend any initial Subsequent Offering Period by any period or periods, provided that the aggregate duration of the Subsequent Offering Period (including extensions thereof) is no more than 20 business days. Pursuant to Rule 14d-7(a)(2) under the Exchange Act, withdrawal rights do not apply to Shares tendered during a Subsequent Offering Period. A Subsequent Offering Period, if one is provided, is not an extension of the Offer, which already would have been completed. For purposes of the Offer, a “business day” means any day other than a Saturday, Sunday or a U.S. federal holiday and consists of the time period from 12:01 a.m. through 12:00 Midnight, New York City time. If Purchaser elects to provide or extend a Subsequent Offering Period, Purchaser will make a public announcement of such Subsequent Offering Period or extension no later than 9:00 a.m., New York City time, on the next business day after the Expiration Date or the date of termination of the prior Subsequent Offering Period.

2

Purchaser also reserves the right to waive, in whole or in part, any of the conditions to the Offer and to change the Offer Price, provided that Dionex’s consent is required for Purchaser to (i) reduce the number of Shares subject to the Offer, (ii) reduce the Offer Price, (iii) change, modify or waive the Minimum Condition, (iv) add any conditions to the Offer in addition to those set forth in Section 15 of the Offer to Purchase, (v) except as described above, extend or otherwise change the Expiration Date, (vi) change the form of consideration payable in the Offer or (vii) otherwise amend, modify or supplement any other terms of the Offer.

In order to take advantage of the Offer, a tendering stockholder must either (i) complete and sign the Letter of Transmittal in accordance with the instructions in the Letter of Transmittal, have such stockholder’s signature guaranteed (if required by Instruction 1 to the Letter of Transmittal), mail or deliver the Letter of Transmittal (or a facsimile copy) and any other required documents to the Depositary, and either deliver the certificates representing the tendered Shares along with the Letter of Transmittal to the Depositary or tender such Shares pursuant to the procedures for book-entry transfer set forth in Section 3 of the Offer to Purchase or (ii) request such stockholder’s broker, dealer, commercial bank, trust company or other nominee to effect the transaction. If Shares are registered in the name of a broker, dealer, commercial bank, trust company or other nominee, a tendering stockholder must contact such broker, dealer, commercial bank, trust company or other nominee to tender such Shares. If a tendering stockholder desires to tender Shares, and certificates evidencing such Shares are not immediately available, or if a tendering stockholder cannot comply with the procedures for book-entry transfer described in the Offer to Purchase on a timely basis, or cannot deliver all required documents to the Depositary prior to the expiration of the Offer, such tendering stockholder may tender Shares by following the procedures for guaranteed delivery set forth in Section 3 of the Offer to Purchase.

For purposes of the Offer, Purchaser will be deemed to have accepted for payment tendered Shares when, as and if Purchaser gives oral or written notice of Purchaser’s acceptance to the Depositary. Purchaser will pay for Shares accepted for payment pursuant to the Offer by depositing the purchase price with the Depositary, which will act as agent for tendering stockholders for the purpose of receiving payments from Purchaser and transmitting such payments to tendering stockholders. Under no circumstances will Purchaser pay interest on the consideration paid for Shares pursuant to the Offer, regardless of any extension of the Offer or any delay in making such payment.

In all cases (including during any Subsequent Offering Period), Purchaser will pay for Shares accepted for payment pursuant to the Offer only after timely receipt by the Depositary of (i) certificates representing such Shares or timely confirmation of the book-entry transfer of such Shares into the Depositary’s account at the Book-Entry Transfer Facility (as defined in the Offer to Purchase) pursuant to the procedures set forth in Section 3 of the Offer to Purchase, (ii) a properly completed and duly executed Letter of Transmittal (or facsimile thereof) with all required signature guarantees or, in the case of a book-entry transfer, an Agent’s Message (as defined in Section 3 of the Offer to Purchase) in lieu of the Letter of Transmittal, and (iii) any other documents required by the Letter of Transmittal.

Except as otherwise provided in the Offer to Purchase, tenders of Shares made in the Offer are irrevocable. Shares tendered pursuant to the Offer may be withdrawn at any time before the Expiration Date and, unless previously accepted for payment as provided herein, may also be withdrawn after February 18, 2011. For a withdrawal to be effective, a written, telegraphic or facsimile transmission notice of withdrawal with respect to the Shares must be timely received by the Depositary at one of its addresses set forth on the back cover of the Offer to Purchase, and the notice of withdrawal must specify the name of the person who tendered the Shares to be withdrawn, the number of Shares to be withdrawn and the name of the registered holder of Shares, if different from that of the person who tendered such Shares. If the Shares to be withdrawn have been delivered to the Depositary, a signed notice of withdrawal with (except in the case of Shares tendered by an Eligible Institution (as defined in the Offer to Purchase)) signatures guaranteed by an Eligible Institution must be submitted before the release of such Shares. In addition, such notice must specify, in the case of Shares tendered by delivery of certificates, the serial numbers shown on the specific certificates evidencing the Shares to be withdrawn or, in the case of Shares tendered by book-entry transfer, the name and number of the account at the Book-Entry Transfer Facility to be credited with the withdrawn Shares. Withdrawals may not be rescinded, and Shares withdrawn will thereafter be deemed not validly tendered. However, withdrawn Shares may be retendered at any time before the Expiration Date by following the tender procedures described in Section 3 of the Offer to Purchase.

The exchange of Shares for cash pursuant to the Offer, during a Subsequent Offering Period or pursuant to the Merger will be a taxable transaction for U.S. federal income tax purposes and may also be a taxable transaction under applicable state, local and other tax laws. All stockholders should consult with their own tax advisors as to the particular tax consequences of exchanging their Shares pursuant to the Offer, during a Subsequent Offering Period or pursuant to the Merger.

3

The information required to be disclosed by paragraph (d)(1) of Rule 14d-6 of the General Rules and Regulations under the Securities Exchange Act of 1934, as amended, is contained in the Offer to Purchase and is incorporated herein by reference.

Dionex has provided to Purchaser its list of stockholders and security position listings for the purpose of disseminating the Offer to holders of Shares. The Offer to Purchase, the related Letter of Transmittal and other related materials will be mailed to record holders of Shares and will be furnished to brokers, dealers, commercial banks, trust companies and similar persons whose names, or the names of whose nominees, appear on the stockholder list or, if applicable, who are listed as participants in a clearing agency’s security position listing, for subsequent transmittal to beneficial owners of Shares.

The Offer to Purchase and the related Letter of Transmittal contain important information that should be read carefully before any decision is made with respect to the Offer.

Questions and requests for assistance and copies of the Offer to Purchase, the Letter of Transmittal and all other tender offer materials may be directed to the Information Agent at its address and telephone numbers set forth below and will be furnished promptly at Purchaser’s expense. Neither Thermo Fisher nor Purchaser will pay any fees or commissions to any broker or dealer or any other person (other than to the Information Agent, the dealer managers for the Offer and the Depositary) in connection with the solicitation of tenders of Shares pursuant to the Offer.

The Information Agent for the Offer is:

501 Madison Avenue, 20th floor

New York, New York 10022

Shareholders may call toll free (877) 825-8964

Banks and Brokers may call collect (212) 750-5833

The Dealer Managers for the Offer are:

Barclays Capital Inc. 745 Seventh Avenue, 3rd Floor New York, New York 10019 Attention: Equity Corporate Services	J.P. Morgan Securities, LLC 383 Madison Ave, 5th Floor New York, New York 10179 Toll free: (877) 371-5947
Toll Free: (888) 610-5877

December 20, 2010

4