Accurate Measurement of the Optical Properties of Single Aerosol Particles Using Cavity Ring-Down Spectroscopy.
Accurate Measurement of the Optical Properties of Single Aerosol Particles Using Cavity Ring-Down Spectroscopy.
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DOI：
10.1021/acs.jpca.2c01246
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发表时间：
2022-05-05
期刊：
影响因子：
--
通讯作者：
Orr-Ewing AJ
中科院分区：
文献类型：
--
作者：
Cotterell MI;Knight JW;Reid JP;Orr-Ewing AJ
气溶胶光学特性的敏感和准确的量化的新方法是必要的，以提高目前的理解独特的物理化学的空气中的颗粒，并探索其在不同领域的作用，如化学制造，医疗保健和大气科学。我们率先使用腔衰荡光谱（CRDS），与并发的角度分辨弹性光散射测量，询问悬浮在光学和电动势阱中的单个气溶胶粒子的光学特性。这种方法能够对已知尺寸的单个颗粒的光学特性（例如消光截面）进行稳健的量化。我们的测量现在可以区分散射和吸收对整体消光的贡献，从中可以检索复折射率的真实的和虚分量并将其与化学成分联系起来。在这篇专题文章中，我们展示了这种创新的测量平台可以对球形和非球形颗粒进行准确和精确的光学测量，无论是在CRDS探测波长下的非吸收还是吸收。我们讨论了目前的限制，我们的方法和物理和大气化学的主要挑战，现在可以解决由CRDS测量悬浮在受控环境中的单个气溶胶颗粒。
New approaches for the sensitive and accurate quantification of aerosol optical properties are needed to improve the current understanding of the unique physical chemistry of airborne particles and to explore their roles in fields as diverse as chemical manufacturing, healthcare, and atmospheric science. We have pioneered the use of cavity ring-down spectroscopy (CRDS), with concurrent angularly resolved elastic light scattering measurements, to interrogate the optical properties of single aerosol particles levitated in optical and electrodynamic traps. This approach enables the robust quantification of optical properties such as extinction cross sections for individual particles of known size. Our measurements can now distinguish the scattering and absorption contributions to the overall light extinction, from which the real and imaginary components of the complex refractive indices can be retrieved and linked to chemical composition. In this Feature Article, we show that this innovative measurement platform enables accurate and precise optical measurements for spherical and nonspherical particles, whether nonabsorbing or absorbing at the CRDS probe wavelength. We discuss the current limitations of our approach and the key challenges in physical and atmospheric chemistry that can now be addressed by CRDS measurements for single aerosol particles levitated in controlled environments.
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影响因子：
5.9
作者：
Bzdek, Bryan R.;Reid, Jonathan P.;Cotterell, Michael I.
通讯作者：
Cotterell, Michael I.
影响因子：
5.2
作者：
Cotterell, Michael I.;Szpek, Kate;Langridge, Justin M.
通讯作者：
Langridge, Justin M.
影响因子：
6.3
作者：
Andreae, Meinrat O.
通讯作者：
Andreae, Meinrat O.
影响因子：
3.8
作者：
Cotterell, Michael I.;Orr-Ewing, Andrew J.;Langridge, Justin M.
通讯作者：
Langridge, Justin M.
影响因子：
6.3
作者：
Cotterell, Michael I.;Willoughby, Rose E.;Reid, Jonathan P.
通讯作者：
Reid, Jonathan P.