National Institute of Standards & Technology, Acquisition & Assistance Div., Bldg. 301, Rm B117, Gaithersburg, MD 20899

66 -- HIGH RESOLUTION X-RAY OPTICS POSITIONING SYSTEMS FOR PREPARATION AND ANALYSIS OF X-RAY BEAMS SOL 53SBNB860102 DUE 072898 POC Anita Tolliver, Contract Specialist/Contracting Officer, #301/975-6308, Fax # 301/963-7732 WEB: NIST Contracts Homepage, http://www.nist.gov/admin/od/contract/contract.htm. E-MAIL: NIST Contracts Office, Contract@nist.gov. The National Institute of Standards and Technology (NIST) intends to award a purchase order on or about July 29, 1998 to Blake Industries, Incorporated on a sole-source basis for a positioning and shielding assembly of an x-ray beam monochromator; and a positioning assembly for an analyzer described by the following specifications: The required items include the positioning and shielding assembly of an x-ray beam monochromator which shall be able to condition the emission spectra of a Cu target to produce beams with a divergence of 5 or 12 arcsec. A second component shall consist of the positioning assembly for an analyzer with a divergence of 5 or 12 arcsec with an additional goniometer for positioning a detector. The monochromator shall utilize the Bartells geometry and be capable of independently positioning the two channel cut crystal optics in either of two, symmetric and asymmetric, channels. The analyzer shall also be capable of utilizing either of the two channels of the crystal optic. Each crystal optic shall be secured using magnetically assisted kinematic mounts and be positioned with tilt stages utilizing trapezoidal flexural structures which can rotate the crystal about an axis parallel to the x-ray beam and no more than 4mm from it, translation stages to alternate between the two channels, and rotation stages to position the crystals at the diffraction angle. The rotation and translation stages, as well as the actuators for the tilt stages shall be supplied by NIST. The monochromator assembly shall include suitable shielding and slit systems and be built such that the positioning equipment is located above the optics. A tangent arm assembly for positioning of the sample goniometer assembly shall be included. Substitution of components from alternative vendors, even if said components could meet our performance specifications, would require a complete redesign of the monochromator and analyzer assemblies. This would place an unacceptable complication on the successful realization of the functioning monochromator and analyzer assemblies. The authority for this non-competitive acquisition is 41 USC 253(c)(1). This notice is not a request for quotations; however, interested parties may identify their interest and capability to satisfy the Government's requirement NLT the response date. The Government will verbally request a written quotation from Blake Industries, Incorporated. A determination by the Government not to compete this proposed purchase order based upon responses to this notice is solely within the discretion of the contracting officer. A solicitation document is not available. See numbered Note 26. Posted 07/14/98 (W-SN222774). (0195)

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