Lifetimes and quenching of B2Σ+ PO by atmospheric gases
Lifetimes and quenching of B2Σ+ PO by atmospheric gases
复制标题
B2Σ+ PO 的寿命和大气气体猝灭
DOI：
--
复制
发表时间：
1986
期刊：
影响因子：
--
通讯作者：
L. J. Decker
中科院分区：
文献类型：
--
作者：
K. N. Wong;W. Anderson;A. J. Kotlar;M. Dewilde;L. J. Decker
在气相PO的B2 π +<$X2 π体系中，用脉冲激光激发荧光，测量了B态在v '= 0时的寿命.在Ar或He载气压力为1.2托时，对几个选定的J'能级进行旋转分辨测量，发现寿命与激发的旋转能级无关。较早的测量相对荧光强度在v '= 0振动级数被重新解释提取依赖于核间距的电子跃迁矩。使用这个过渡时刻，没有寿命依赖于旋转水平是可以预期的，即使在低压。速率常数的B状态PO的N2，O2，CO2，和H2O的淬火，其上限为He和Ar的报告。发现O2与基态PO反应。进行速率常数的粗略测量。将结果与其他两个已知的测量结果进行比较。速率常数与以前的测量结果非常一致，但与此不太一致。
Pulsed laser excited fluorescence in the B 2Σ+ ← X 2π system of gas phase PO was used to measure the lifetime for v’=0 of the B state. Rotationally resolved measurements for a few selected J’ levels, at Ar or He carrier gas pressures of ∼2 Torr, reveal no dependence of the lifetime on the rotational level excited. Earlier measurements of relative fluorescence intensities in the v’=0 vibrational progression were reinterpreted to extract the dependence of the electronic transition moment on internuclear distance. Using this transition moment, no lifetime dependence on rotational level is to be expected, even at low pressures. Rate constants for quenching of the B state PO by N2, O2, CO2, and H2O, and upper limits thereof for He and Ar are reported. O2 was found to react with ground state PO. A crude measurement of the rate constant was performed. The result is compared to two other known measurements. The rate constant is in excellent agreement with the previous measurement, but in poor agreement with that ...