The National Institute of Standards and Technology (NIST) is seeking to procure Helium-3 gas on a sole-source basis from Linde Gas & Equipment, Inc. for its Quantum Sensors Group, which requires the gas for advanced refrigeration systems that enable high-performance sensor technology. The procurement involves supplying 30 standard temperature and pressure liters of gaseous Helium-3 with an atomic purity exceeding 99.9%, delivered in a securely valved vessel compatible with standard gas manifold connections, within eight weeks after receipt of order. Interested parties that can meet these specifications must submit their capabilities in writing to the primary contact, Lisa Stevens, at lisa.stevens@nist.gov by the response deadline, as this notice is not a solicitation but a means to assess potential competition for the contract expected to be awarded by July 1, 2025.