NASA/NSSC intends to issue a sole source contract to Thermo Electron North America LLC for a Thermo Scientific service plan for the HELIX MC Plus Noble Gas Isotope Ratio Mass Spectrometer. Performance of the services will be located at NASA’s Goddard Space Flight Center (GSFC). No budget amount is specified in the description. Interested organizations may submit their capabilities and qualifications in writing by 3:00 p.m. Central Standard Time on June 11, 2026, for consideration of a competitive procurement. The government will evaluate submissions solely to decide whether to compete this requirement.