Photon yields of several reactions producing diatomic strontium oxide and halides, and SrO ( A ′ 1Π– X  1Σ): A new band system

• Published in: The Journal of chemical physics 1975-04, Vol.62 (8), p.3131-3136
• Main Authors: Capelle, Gene A., Broida, H. P., Field, Robert W.
• Format: Article
• Language: English
• ISSN: 0021-9606; 1089-7690
• DOI: 10.1063/1.430859

Strontium atoms were reacted with N2O, O3, O2, NO, Br2, Cl2, and F2 in a flow system to produce the diatomic oxide or halide. Photon yields were measured from these reactions in a bath of argon at pressures of 1.1–9.5 Torr. Photon yields in excess of 6×10−2 for the SrO A 1Σ–X 1Σ band system were observed with both N2O and O3. The total photon yield with F2 producing SrF is also high, exceeding 1×10−2, most of which is due to A 2Π→X 2Σ photons; the B 2Σ, C 2Π, D 2Σ, and E 2Π→X 2Σ systems are also observed, but they give progressively smaller contributions to the total yield. The previously unobserved SrO (A′ 1Π–X 1Σ) band system was seen in chemiluminescence from Sr+O3 and Sr+N2O reactions. Bandhead measurements allowed determination of molecular constants. The constants that correspond to the most probable SrO A′ 1Π vibrational numbering are ν00 = 9310(8), ωe = 472.8(14), ωexe = 2.06(6), Be = 0.2565(20), and αe = 0.0017(3) cm−1.