Transient grating spectroscopy is used to observe slowly forming thermal gratings in a mixture (non-combusting CO/air at ≤0.7 MPa) of two gases that are individually transparent. Thermalization in the mixture implies a photochemical process at 532 nm that populates the metastable singlet level 1Δg in O2 through collision-assisted absorption in O2 pairs. The laser intensity dependence of this process is measured.
- Active oxygen
- Singlet O (Δ)
- Transient grating spectroscopy
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics