The US Geological Survey (USGS) is conducting market research to identify qualified businesses capable of providing components for Scanning Differential Optical Absorption Spectrometer (Scanning DOAS) instruments, which are used to monitor sulfur dioxide in volcanic gas plumes. This is a sources sought notice for planning purposes only, not a request for proposals, and the government will not pay for any response costs. Responses must be submitted electronically to yangzhideng@usgs.gov by 05/12/2026 at 1500 PST. The applicable NAICS code is 334519 with a size standard of 600 employees, and the Product Service Code is 6630. No budget amount or performance location is specified in the description.