The National Institute of Standards and Technology (NIST) intends to negotiate a sole source contract with ANSYS Inc. for the procurement of Ansys Zemax OpticStudio Platinum and Premium software. This acquisition is essential for NIST's project aimed at characterizing extreme ultraviolet (EUV) scintillator materials, which are crucial for developing optical systems that convert EUV radiation into visible light for measurement purposes. The software is uniquely required due to its built-in fluorescence modeling capabilities, which are not available from any other vendor, making ANSYS the sole provider of this proprietary software. Interested parties may submit responses to the government contacts listed, but no solicitation package will be issued, and the contract will be a Firm Fixed Price purchase order under NAICS Code 513210, with a size standard of $47 million.