Temperature sensitivity of molecular oxygen resonant-enhanced multiphoton ionization spectra involving the C3Πg intermediate state
Temperature sensitivity of molecular oxygen resonant-enhanced multiphoton ionization spectra involving the C3Πg intermediate state
复制标题
涉及C3Πg中间态的分子氧共振增强多光子电离谱的温度敏感性
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Adams
中科院分区：
文献类型：
--
作者：
Yue Wu;Zhili Zhang;S. Adams
研究了利用共振增强多光子电离的相干微波瑞利散射测量O2转动温度的方法，以确定温度灵敏度和测量范围。$$Left({3ssigma})的分子氧里德堡态
右)C{{}^{3}}PI_{g}左({v^{素数}=2}
8)$$3SσC3Πgv‘=2已被选为2+1 REMPI过程中的中间状态，该过程已知提供相对较强的REMPI信号。代表双光子{C{{}^{3}}PI_{g}左({v^{素数}=2})的旋转分辨光谱
8)Leftarrow Leftarrow X{{}^{3}}varSigma_{g}^{-}Left({v^{Prime}=0}
$$C3Πgv‘=2←←X3Σg-v“=0在几种气体条件下得到了转变，包括纯氧、类空气合成气体、环境空气以及从室温(~300K)到火焰温度(~1700K)的火焰环境。建立了一个O2 REMPI光谱模型，模拟了实验谱线强度随O2基态温度的变化规律。该模型已在低温(~5℃)条件下进行了验证，并在较宽的温度范围内应用于各种氧气环境，总误差小于±10%。目前的O2 REMPI光谱模型在精度和适合提供旋转温度测量的谱线数量方面都比以前报道的版本有所改进。这项工作详细介绍了一个优化的模型，该模型在各种温度范围内将模拟光谱与完整的实验光谱带进行拟合，包括低温(<；300K)和高温(>；1300kK)。
The technique of measuring O2 rotational temperature by coherent microwave Rayleigh scattering from resonance-enhanced multiphoton ionization (Radar REMPI) has been studied to determine temperature sensitivity and range. The molecular oxygen Rydberg state of $$left( {3ssigma }
ight)C{{}^{3}}Pi_{g} left( {v^{prime } = 2}
ight)$$3sσC3Πgv′=2 has been selected as the intermediate state in the 2 + 1 REMPI process, which is known to provide a relatively strong REMPI signal. Rotational-resolved spectra representing the two-photon $$C{{}^{3}}Pi_{g} left( {v^{prime } = 2}
ight) leftarrow leftarrow X{{}^{3}}varSigma _{g}^{ - } left( {v^{prime prime } = 0}
ight)$$C3Πgv′=2←←X3Σg-v″=0 transition have been obtained under several gas conditions including pure oxygen, air-like syngas, ambient air, and flame environments from room temperature (~300 K) to flame temperature (~1700 K). An O2 REMPI spectral model has been developed to simulate the experimental spectral line intensity distribution which is dependent on the O2 ground-state temperature. The model has been verified at a low-temperature condition (~5 K) and then applied to various oxygen environments over an extended temperature range with an overall error of less than ±10 %. The current O2 REMPI spectral model is an improvement over a previously reported version in both accuracy and the quantity of lines fit to provide rotational temperature measurements. This work details an optimized model that fits simulated spectra to full experimental spectral bands over various conditions with a wide temperature range, including both low temperature (<300 K) and high temperature ranges (>1300 K).