Amendment 2 to Solicitation for Ultra - High Vacuum Sample Backout Chamber Extension of Time

2026-11-03

AMENDMENT 2 : Extension of time 1 week from February 25 , 2026 to new date for responses March 4 , 2026 . AMENDMENT TO SOLICITATION FOR VENDOR QUESTIONSSolicitation 1333ND26QNB030068 Ultra High Vacuum Sample Backout ChamberVendor Question 1 : To accurately provide a quote for the chamber and frame , I would need a drawing , STEP file , and / or sketch , as a written description alone is not sufficient for an accurate quote . NIST Response : There are many ways to design and assemble a system with the capabilities that we are requesting . We have not provided a technical drawing to allow the vendor the flexibility to design a system to meet our specifications as they see fit . We will evaluate on conformance to specifications , not a particular design . Vendor Question 2 : Regarding Technical Specification b . “ Partial pressure for masses > 44 AMU : < 5e - 11 Torr ”: How is this intended to be controlled / measured with a base pressure of 1e - 8 Torr . NIST Response : We will verify the stated specification with an RGA unit in our lab . Ultimately , this specification is to ensure that the UHV system is not contaminated with higher amu contaminants . The overall pressure is allowed to be 1e - 8 Torr due to lower amu components ( e . g . water ) that we can more readily get rid of with a bake - out . We are not equipped to do the requisite UHV cleaning for higher mass contaminants ( silicones , oils , etc .) so this requirement ensures the vendor provides us with a UHV - clean system . Vendor Question 3 : Will a cylindrical chamber work rather than a cube or a sphere , so long as the volume requirements are met and there are enough ports ? NIST Response : A cylindrical chamber with the same 12 ” opening dimensions would also suffice . Vendor Question 4 : What is the geometry of the sample types to be going into the chamber ? Is it like a wafer ? NIST Response : We will be using this chamber on a variety of sample sizes and shapes . As defined in the attached Combined Synopsis Solicitation , Statement of Work and applicable Clauses and Provisions .

Rocky Mountain E-Purchasing System

2026-05-06