Collisional excitation kinetics forO(3sSo5)andO(3pP35)states using laser absorption spectroscopy in shock-heated weakly ionizedO2-Ar mixture,Physical Review E

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Collisional excitation kinetics forO(3sSo5)andO(3pP35)states using laser absorption spectroscopy in shock-heated weakly ionizedO2-Ar mixture
Physical Review E ( IF 2.2 ) Pub Date : 2021-06-21 , DOI: 10.1103/physreve.103.063211
Yang Li ₁ , Yu Wang ₁ , David F Davidson ₁ , Ronald K Hanson ₁

Affiliation

Collisional excitation kinetics for atomic oxygen is studied behind reflected shock waves in

1 % O_{2} / Ar

mixtures over 10 000–11 000K using laser absorption spectroscopy of the O(

3 s {}^{5}S^{o}

) to

O (3 p {}^{5}P_{3}

) transition at 777 nm and the

O (3 p {}^{5}P_{3}

) to O(

3 d {}^{5}D_{2, 3, 4}^{o}

) transitions at 926 nm. Four time histories are inferred simultaneously from the absorbance of the two transitions: the population density of level 4 of atomic oxygen, i.e., the O(

3 s {}^{5}S^{o}

) state,

n_{4}

; the population density of level 6 of atomic oxygen, i.e., the

O (3 p {}^{5}P_{3}

) state,

n_{6}

; the electron number density,

n_{e}

; and the heavy-particle translational temperature,

T_{tr}

. Atomic oxygen in the levels 4 and 6 are not in equilibrium with the ground-state atomic oxygen as the measurements of

n_{4}

and

n_{6}

are generally 3–20 times smaller than the corresponding values under Boltzmann equilibrium at

T_{tr}

. However, these two states are close to partial equilibrium with each other within the test time, indicating strong heavy-particle cross coupling between levels 4 and 6 of atomic oxygen. A simplified two-temperature collisional-radiative (CR) model is developed to study the thermal and chemical nonequilibrium of atomic oxygen following shock heating. The four measured time histories are used to optimize the 12 collisional rate constants in the CR model using a stochastic gradient descent (SGD) algorithm. The time-history results, diagnostic methods, and collisional-radiative model presented in the current study are potentially useful in studies of high-enthalpy air, plasma processing, or other applications involving weakly ionized oxygen.

中文翻译：

O(3sSo5)和O(3pP35)态的碰撞激发动力学在冲击加热的弱电离O2-Ar混合物中使用激光吸收光谱

原子氧的碰撞激发动力学在反射冲击波的背后研究

1 % 哦_{2} / 氩气

使用 O(

3 秒 {}^{5}秒^{○}

）至

哦 (3 磷 {}^{5}磷_{3}

) 777 nm 处的跃迁和

哦 (3 磷 {}^{5}磷_{3}

）也（

3 d {}^{5}D_{2, 3, 4}^{○}

) 在 926 nm 处跃迁。从两个跃迁的吸光度同时推断出四个时间历程：原子氧的 4 级人口密度，即 O(

3 秒 {}^{5}秒^{○}

）状态，

n_{4}

; 原子氧6级的人口密度，即

哦 (3 磷 {}^{5}磷_{3}

）状态，

n_{6}

; 电子数密度，

n_{电子}

; 和重粒子平移温度，

吨_{tr}

. 4 级和 6 级的原子氧与基态原子氧不平衡，因为

n_{4}

和

n_{6}

通常比在 Boltzmann 平衡下的相应值小 3-20 倍

吨_{tr}

. 然而，这两种状态在测试时间内彼此接近部分平衡，表明原子氧的 4 和 6 级之间存在强烈的重粒子交叉耦合。开发了一种简化的两温度碰撞辐射 (CR) 模型来研究冲击加热后原子氧的热和化学非平衡。四个测量的时间历史用于使用随机梯度下降 (SGD) 算法优化 CR 模型中的 12 个碰撞率常数。当前研究中提出的时程结果、诊断方法和碰撞辐射模型可能对高焓空气、等离子体处理或其他涉及弱电离氧的应用的研究有用。

更新日期：2021-06-21

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