Studies on the production of O2(a1Δg, υ = 0) and O2(b1Σg+, υ = 0) from collisional removal of O2(A3Σu+, υ′ = 6–10)
Studies on the production of O2(a1Δg, υ = 0) and O2(b1Σg+, υ = 0) from collisional removal of O2(A3Σu+, υ′ = 6–10)
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碰撞去除 O2(A3Σu+, υ′ = 6–10) 生成 O2(a1Δg, υ = 0) 和 O2(b1Σg+, υ = 0) 的研究
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发表时间：
2007
期刊：
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通讯作者：
T. Slanger
中科院分区：
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作者：
D. Pejaković;R. Copeland;P. Cosby;T. Slanger
[1] 在 240 K 的温度下，研究了通过 O2 和 N2 碰撞去除 O2(A3Σu+) 来产生两种亚稳态 O2 物质 O2(a1Δg, υ = 0) 和 O2(b1Σg+, υ = 0)。采用状态选择双激光技术，其中第一束激光的输出将基态 O2 分子激发到特定的振动能级 (6 ≤ υ′ ≤ 10) 处于 A3Σu+ 态，第二个激光的输出随后通过中间 d1Πg 里德堡态通过共振增强多光子电离来探测 O2(a1Δg, υ = 0) 和 O2(b1Σg+, υ = 0) 群体。对于我们实验相对较短的时间尺度（~10−4 Torr·s），我们发现 O2 碰撞去除 O2(A3Σu+, υ′) 时产生的 O2(a1Δg, υ = 0) 量子产率在 υ′ = 7–9 时近似恒定，而在 υ′ = 6 和 10 时下降 30–40%。 O2(b1Σg+, υ = 0) 产率几乎是恒定的。 ν′ = 8–10 时为常数，当 υ′ = 6 和 7 时降低约 50%。在合成空气中测量的 O2(A3Σu+, υ′ = 8) 中最终的 O2(a1Δg, υ = 0) 和 O2(b1Σg+, υ = 0) 产量几乎等于在纯 O2 中测量的结果，表明 N2 对撞机不会显着影响导致产生两个亚稳态物种。然而，在较短的实验时间内，合成空气中 O2(a1Δg, υ = 0) 群体的积累比 O2 慢得多。
[1] Production of two metastable O2 species, O2(a1Δg, υ = 0) and O2(b1Σg+, υ = 0), from collisional removal of O2(A3Σu+) by O2 and N2 is investigated at a temperature of 240 K. A state-selective two-laser technique is used, in which the output of the first laser excites ground-state O2 molecules to a specific vibrational level (6 ≤ υ′ ≤ 10) in the A3Σu+ state, and the output of the second laser subsequently probes the O2(a1Δg, υ = 0) and O2(b1Σg+, υ = 0) populations by resonance-enhanced multiphoton ionization via the intermediate d1Πg Rydberg state. For the relatively short timescales of our experiment (∼10−4 Torr·s), we find that the O2(a1Δg, υ = 0) quantum yield from collisional removal of O2(A3Σu+, υ′) by O2 is approximately constant for υ′ = 7–9, and decreases by 30–40% for υ′ = 6 and 10. The O2(b1Σg+, υ = 0) yield is nearly constant for υ′ = 8–10, and decreases by about 50% for υ′ = 6 and 7. The eventual O2(a1Δg, υ = 0) and O2(b1Σg+, υ = 0) yields from O2(A3Σu+, υ′ = 8) measured in synthetic air are nearly equal to those measured in pure O2, suggesting that N2 collider does not significantly affect the relaxation pathways leading to the production of the two metastable species. However, at short experimental times the buildup of the O2(a1Δg, υ = 0) population is considerably slower in synthetic air than in O2.