Articles | Volume 18, issue 8
https://doi.org/10.5194/acp-18-5235-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-18-5235-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
18 Apr 2018
Research article |
| 18 Apr 2018
| 18 Apr 2018
Determination of the refractive index of insoluble organic extracts from atmospheric aerosol over the visible wavelength range using optical tweezers
Rosalie H. Shepherd
Central Laser Facility, Research Complex, STFC Rutherford Appleton Laboratory, Oxford, OX11 0FA, UK
Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK
Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK
Amelia A. Marks
British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Neil Brough
British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Andrew D. Ward
Central Laser Facility, Research Complex, STFC Rutherford Appleton Laboratory, Oxford, OX11 0FA, UK
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35 citations as recorded by crossref.
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- Mie scattering from optically levitated mixed sulfuric acid–silica core–shell aerosols: observation of core–shell morphology for atmospheric science M. McGrory et al. 10.1039/D1CP04068E
- Method to measure the size-resolved real part of aerosol refractive index using differential mobility analyzer in tandem with single-particle soot photometer G. Zhao et al. 10.5194/amt-12-3541-2019
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- One year of aerosol refractive index measurement from a coastal Antarctic site Z. Jurányi & R. Weller 10.5194/acp-19-14417-2019
- Ultraviolet refractive index values of organic aerosol extracted from deciduous forestry, urban and marine environments C. Barker et al. 10.1039/D3EA00005B
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- Does gas-phase sulfur dioxide remove films of atmosphere-extracted organic material from the aqueous aerosol air–water interface? E. Stuckey et al. 10.1039/D4EA00098F
- Simultaneous Retrieval of the Size and Refractive Index of Suspended Droplets in a Linear Quadrupole Electrodynamic Balance C. Price et al. 10.1021/acs.jpca.9b10748
- Variability of Aerosols and Clouds Over North Indian and Myanmar During the COVID-19 Lockdown Period D. Lawand et al. 10.3389/fenvs.2022.838778
- Measurement of gas-phase OH radical oxidation and film thickness of organic films at the air–water interface using material extracted from urban, remote and wood smoke aerosol R. Shepherd et al. 10.1039/D2EA00013J
- Aqueous Radical Initiated Oxidation of an Organic Monolayer at the Air–Water Interface as a Proxy for Thin Films on Atmospheric Aerosol Studied with Neutron Reflectometry S. Jones et al. 10.1021/acs.jpca.3c03846
- Inferring Fine-Mode and Coarse-Mode Aerosol Complex Refractive Indices from AERONET Inversion Products over China Q. Chen et al. 10.3390/atmos10030158
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- Determining the size and refractive index of homogeneous spherical aerosol particles using Mie resonance spectroscopy L. Lew et al. 10.1364/AO.57.004601
- A brief history of the octopus imaging facility to celebrate its 10th anniversary M. MARTIN‐FERNANDEZ 10.1111/jmi.12974
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- Modelling Complex Refractive Indices of Sub-micron Pure and Polluted Dust based on Compositional Sensitive Analysis . Sarla et al. 10.1007/s12647-022-00547-4
- Photochemical Aging of Levitated Aqueous Brown Carbon Droplets S. Jones et al. 10.1021/acsearthspacechem.1c00005
- Insights into the real part of natural sea spray aerosol refractive index in the Pacific Ocean C. Fan et al. 10.5194/acp-25-5761-2025
- In Situ Sol–Gel Synthesis of Unique Silica Structures Using Airborne Assembly: Implications for In-Air Reactive Manufacturing C. Barker et al. 10.1021/acsanm.2c02683
- Assessing the accuracy of low-cost optical particle sensors using a physics-based approach D. Hagan & J. Kroll 10.5194/amt-13-6343-2020
- Separation-dependent near-field effects in Mie scattering spectra of two optically trapped aerosol droplets C. Barker et al. 10.1364/OE.520251
- Formation of Secondary Brown Carbon in Biomass Burning Aerosol Proxies through NO3 Radical Reactions C. Li et al. 10.1021/acs.est.9b05641
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- The lifetimes and potential change in planetary albedo owing to the oxidation of thin surfactant organic films extracted from atmospheric aerosol by hydroxyl (OH) radicals at the air–water interface of particles R. Shepherd et al. 10.5194/acp-25-2569-2025
- Determination of the refractive index of insoluble organic extracts from atmospheric aerosol over the visible wavelength range using optical tweezers R. Shepherd et al. 10.5194/acp-18-5235-2018
- Recent advances in experimental techniques for investigating aerosol surface tension A. Bain 10.1080/02786826.2024.2373907
33 citations as recorded by crossref.
- Mie scattering from strongly absorbing airborne particles in a photophoretic trap A. Bain & T. Preston 10.1063/1.5082157
- Determination of the refractive index of ambient aerosols G. Zhao et al. 10.1016/j.atmosenv.2020.117800
- Mie scattering from optically levitated mixed sulfuric acid–silica core–shell aerosols: observation of core–shell morphology for atmospheric science M. McGrory et al. 10.1039/D1CP04068E
- Method to measure the size-resolved real part of aerosol refractive index using differential mobility analyzer in tandem with single-particle soot photometer G. Zhao et al. 10.5194/amt-12-3541-2019
- Simple retrieval of the real part of the refractive index for ambient aerosols using extinction coefficient analysis via camera and volume size distribution J. Shin et al. 10.1016/j.atmosenv.2024.120537
- One year of aerosol refractive index measurement from a coastal Antarctic site Z. Jurányi & R. Weller 10.5194/acp-19-14417-2019
- Ultraviolet refractive index values of organic aerosol extracted from deciduous forestry, urban and marine environments C. Barker et al. 10.1039/D3EA00005B
- Operando Studies of Aerosol-Assisted Sol–Gel Catalyst Synthesis via Combined Optical Trapping and Raman Spectroscopy G. Davies et al. 10.1021/acs.jpcc.1c07517
- Does gas-phase sulfur dioxide remove films of atmosphere-extracted organic material from the aqueous aerosol air–water interface? E. Stuckey et al. 10.1039/D4EA00098F
- Simultaneous Retrieval of the Size and Refractive Index of Suspended Droplets in a Linear Quadrupole Electrodynamic Balance C. Price et al. 10.1021/acs.jpca.9b10748
- Variability of Aerosols and Clouds Over North Indian and Myanmar During the COVID-19 Lockdown Period D. Lawand et al. 10.3389/fenvs.2022.838778
- Measurement of gas-phase OH radical oxidation and film thickness of organic films at the air–water interface using material extracted from urban, remote and wood smoke aerosol R. Shepherd et al. 10.1039/D2EA00013J
- Aqueous Radical Initiated Oxidation of an Organic Monolayer at the Air–Water Interface as a Proxy for Thin Films on Atmospheric Aerosol Studied with Neutron Reflectometry S. Jones et al. 10.1021/acs.jpca.3c03846
- Inferring Fine-Mode and Coarse-Mode Aerosol Complex Refractive Indices from AERONET Inversion Products over China Q. Chen et al. 10.3390/atmos10030158
- Exploring the Role of Room Temperature Ionic Liquid as a Transducer in Electrochemical Soil Probing: A case study with [BMIM] [BF4] V. Dhamu et al. 10.1149/1945-7111/abe8e9
- Sizing response of the Ultra-High Sensitivity Aerosol Spectrometer (UHSAS) and Laser Aerosol Spectrometer (LAS) to changes in submicron aerosol composition and refractive index R. Moore et al. 10.5194/amt-14-4517-2021
- Optical trapping and light scattering in atmospheric aerosol science A. Rafferty et al. 10.1039/D2CP05301B
- Deep learning-based size prediction for optical trapped nanoparticles and extracellular vesicles from limited bandwidth camera detection D. Boateng et al. 10.1364/BOE.501430
- Simultaneous retrievals of biomass burning aerosols and trace gases from the ultraviolet to near-infrared over northern Thailand during the 2019 pre-monsoon season U. Jeong et al. 10.5194/acp-22-11957-2022
- A method to obtain scattering phase function based on particle size distribution and refractive index retrieved from Aurora 4000 multi-angle scattering measurements: A numerical study L. Ran et al. 10.1016/j.atmosenv.2023.120138
- Determining the size and refractive index of homogeneous spherical aerosol particles using Mie resonance spectroscopy L. Lew et al. 10.1364/AO.57.004601
- A brief history of the octopus imaging facility to celebrate its 10th anniversary M. MARTIN‐FERNANDEZ 10.1111/jmi.12974
- Shining New Light on the Kinetics of Water Uptake by Organic Aerosol Particles M. Diveky et al. 10.1021/acs.jpca.1c00202
- Modelling Complex Refractive Indices of Sub-micron Pure and Polluted Dust based on Compositional Sensitive Analysis . Sarla et al. 10.1007/s12647-022-00547-4
- Photochemical Aging of Levitated Aqueous Brown Carbon Droplets S. Jones et al. 10.1021/acsearthspacechem.1c00005
- Insights into the real part of natural sea spray aerosol refractive index in the Pacific Ocean C. Fan et al. 10.5194/acp-25-5761-2025
- In Situ Sol–Gel Synthesis of Unique Silica Structures Using Airborne Assembly: Implications for In-Air Reactive Manufacturing C. Barker et al. 10.1021/acsanm.2c02683
- Assessing the accuracy of low-cost optical particle sensors using a physics-based approach D. Hagan & J. Kroll 10.5194/amt-13-6343-2020
- Separation-dependent near-field effects in Mie scattering spectra of two optically trapped aerosol droplets C. Barker et al. 10.1364/OE.520251
- Formation of Secondary Brown Carbon in Biomass Burning Aerosol Proxies through NO3 Radical Reactions C. Li et al. 10.1021/acs.est.9b05641
- Characterization of a modified printed optical particle spectrometer for high-frequency and high-precision laboratory and field measurements S. Kasparoglu et al. 10.5194/amt-15-5007-2022
- 悬浮微粒的光学捕获与光谱技术研究进展 钟. Zhong Hang et al. 10.3788/CJL230911
- The lifetimes and potential change in planetary albedo owing to the oxidation of thin surfactant organic films extracted from atmospheric aerosol by hydroxyl (OH) radicals at the air–water interface of particles R. Shepherd et al. 10.5194/acp-25-2569-2025
2 citations as recorded by crossref.
- Determination of the refractive index of insoluble organic extracts from atmospheric aerosol over the visible wavelength range using optical tweezers R. Shepherd et al. 10.5194/acp-18-5235-2018
- Recent advances in experimental techniques for investigating aerosol surface tension A. Bain 10.1080/02786826.2024.2373907
Latest update: 12 Sep 2025
Short summary
The refractive index of atmospheric extracts sourced from urban (London), remote (Antarctica), and woodsmoke aerosol was determined by applying optical trapping simultaneously with Mie spectroscopy. In addition, owing to the absorbing nature of woodsmoke and an aqueous humic acid aerosol extract, the absorption Ångström exponent could be determined.The refractive index and absorption Ångström exponent were then applied in a top-of-the-atmosphere albedo radiation transfer model.
The refractive index of atmospheric extracts sourced from urban (London), remote (Antarctica),...
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