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3-Pentanone LIF at elevated temperatures and pressures: measurements and modeling

机译:3-戊酮LIF在高温和高压下:测量和建模

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摘要

The objective of this study is to investigate 3-pentanone fluorescence experiments in a constant volume vessel at high temperature and high pressure to underline the influent parameters in conditions close to those encountered in internal combustion engines. To obtain quantitative analysis, measured fluorescence signals must be corrected by considering the influence of preponderant parameters such as temperature, pressure and gas composition. Quantitative dependences of fluorescence on thermodynamic parameters are measured and compared with the predictions of a photophysical model, which combines the effects of temperature, pressure, excitation wavelength on fluorescence quantum yield. The increase of 3-pentanone fluorescence with pressure is due to the vibrational relaxation of energy levels. The fluorescence decreases with increasing temperature, except at low temperature where the fluorescence increase is due to an activation of intersystem crossing between triplet toward singlet levels. The influences of thermodynamic parameters are based on an increase of the non-radiative decay rate with the vibrational energy level of excited electronic state and the important collisions to remove the excess vibrational energy. Experimental and calculated results show a satisfactory agreement.
机译:这项研究的目的是在高温高压下在恒定容积的容器中研究3-戊酮荧光实验,以强调进水参数在接近内燃机的条件下。为了获得定量分析,必须通过考虑诸如温度,压力和气体成分等主要参数的影响来校正测得的荧光信号。测量了荧光对热力学参数的定量依赖性,并将其与光物理模型的预测结果进行了比较,该模型结合了温度,压力,激发波长对荧光量子产率的影响。 3-戊酮荧光随压力的增加是由于能级的振动弛豫。荧光随着温度的升高而降低,除了在低温下,荧光的升高是由于三重态向单峰态之间的系统间交叉的激活所致。热力学参数的影响是基于非辐射衰减率随激发电子态的振动能级以及重要的碰撞的增加而产生的,以消除多余的振动能。实验和计算结果显示出令人满意的一致性。

著录项

  • 来源
    《Applied physics. B, Lasers and optics》 |2007年第1期|p.193-204|共12页
  • 作者

    V. MODICA; C. MORIN; P. GUIBERT;

  • 作者单位

    Laboratoire de Mecanique Physique, Universite Pierre et Marie Curie (Paris 6) - CNRS FRE 2867, 2, place de la Gare de Ceinture, 78210 Saint-Cyr-l'Ecole, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

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