综合吸收光谱测量2-尼托醇和纳乙烯
Zhongmei Yang1, Meng Wang1,2, Dean S Venables2
1China Machinery Industry Federation Key Laboratory of Multiphase Flow Measurement, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
International journal of molecular sciences
|October 29, 2025
概括
这项研究引入了一种新的系统,用于在高温下测量有机化合物的气体吸收截面. 综合吸收光谱法为大气建模提供了至关重要的准确数据.
科学领域:
- 大气化学 大气化学
- 频谱学是一种光谱学.
- 化学物理 化学物理
背景情况:
- 精确的气相吸收截面对于大气和高温过程建模至关重要.
- 对于低挥发性有机化合物 (LVOCs) 的现有数据经常显示出差异,特别是在高温下.
研究的目的:
- 开发和验证LVOCs,特别是半挥发性有机化合物 (SVOCs) 的气相吸收截面的高精度测量系统.
- 在大气相关条件下确定这些截面的温度依赖性.
主要方法:
- 使用集成吸收光谱 (IAS) 与温度控制的入口和电池 (473 K) 和载气相结合.
- 测量了UV-Vis范围 (250-400nm) 中的2-尼托芬醇 (2-NP) 和纳夫他林的吸收截面.
主要成果:
- 在473K的2-NP的确定峰值截面:2.31 × 10−17 cm2/分子 (260 nm) 和1.16 × 10−17 cm2/分子 (335 nm).
- 测量到的烯截面从1.62 × 10−17 减至1.28 × 10−17 cm2/分子 (258-280 nm) 在473 K.下降.
- 在高温下观察到光谱扩大和峰值截面缩小,与热力学理论一致,并解决低温数据差异.
结论:
- 开发的IAS系统提供了一种可靠的方法,用于在高温下量化SVOCs的吸收截面.
- 该系统生成的高温数据通过解决现有的数据冲突来提高大气模型的可靠性.
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