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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Measurements of the Imaginary Component of the Refractive Index of Weakly Absorbing Single Aerosol Particles
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Measurements of the Imaginary Component of the Refractive Index of Weakly Absorbing Single Aerosol Particles

机译：弱吸收单个气溶胶颗粒折射率的虚部的测量

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摘要

The interaction of atmospheric aerosols with radiation remains a significant source of uncertainty in modeling radiative forcing. Laboratory measurements of the microphysical properties of atmospherically relevant particles is one approach to reduce this uncertainty. We report a new method to investigate light absorption by a single aerosol particle, inferring changes in the imaginary part of the refractive index with a change in environmental conditions (e.g., relative humidity) and inferring the size dependence of the optical extinction cross section. More specifically, we present measurements of the response of single aerosol particles to near-infrared (NIR) laser-induced heating at a wavelength of 1520 nm. Particles were composed of aqueous NaCl or (NH4)(2)SO4 and were studied over ranges in relative humidity (4085%), particle radius (12.2 mu m), and NIR laser power. The ensuing size change and real component of the refractive index were extracted from measurements of the angular variation in elastically scattered light. From the heating-induced size change at varying NIR beam intensities, we retrieved the change in the imaginary component of the refractive index. In addition, cavity ring-down spectroscopy measurements monitored the change in extinction cross section with modulation of the heating laser power.
机译：大气气溶胶与辐射的相互作用仍然是辐射强迫造型中的不确定性的重要来源。实验室测量大气相关颗粒的微神科性质是一种减少这种不确定性的一种方法。我们报告了一种新方法来调查单个气溶胶颗粒的光吸收，推断折射率的虚部的变化，其环境条件（例如，相对湿度）的变化和推断光学消光横截面的尺寸依赖性。更具体地，我们在1520nm的波长下呈现单个气溶胶颗粒对近红外（NIR）激光诱导的加热的测量。颗粒由NaCl或（NH 4）（2）（2）SO 4组成，并在相对湿度（4085％），颗粒半径（12.2μm）和Nir激光功率的范围内进行研究。从弹性散射光线的角度变化的测量中提取折射率的随后的尺寸变化和实体分量。根据不同的NIR光束强度的加热诱导的尺寸变化，我们检测了折射率的虚部的变化。此外，腔响斜光谱测量测量监测了加热激光功率调制的消光横截面的变化。

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