Determination of complex refractive index of polystyrene microspheres from 370 to 1610 nm

Ma, Xiaochen; Lu, Jun Q.; Brock, R. Scott; Jacobs, Kenneth M.; Yang, Ping; Hu, Xinhua

doi:10.1088/0031-9155/48/24/013

Cited by 329 publications

(274 citation statements)

References 15 publications

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“…These values are lower than the retrieved values reported here. However, the values reported here are more consistent with Chartier and Greenslade (2012), who recently measured a real part of the refractive index n = 1.81 (±0.03) at λ = 248 nm and n = 1.72 (±0.02) at λ = 335 nm, which is greater than the results reported for particles in suspension by French et al (2007) and Ma et al (2003).…”

Section: R a Washenfelder Et Al: Aerosol Extinction In The Uv Specsupporting

confidence: 87%

“…Refractive indices have been reported for bulk samples (Matheson and Saunderson, 1952;Nikolov and Ivanov, 2000;Sultanova et al, 2003), particles in suspension (Bateman et al, 1959;Smart and Willis, 1967;Ma et al, 2003;French et al, 2007), and aerosol particles (Pettersson et al, 2004;Abo Riziq et al, 2007;Baynard et al, 2007;Lang-Yona et al, 2009;Chartier and Greenslade, 2012). These measurements are nicely summarized by Miles et al (2010), with the exception of the more recent Chartier and Greenslade (2012) result.…”

Section: Comparison Of Psl Refractive Index To Published Valuesmentioning

confidence: 94%

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Broadband measurements of aerosol extinction in the ultraviolet spectral region

et al. 2013

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Aerosols influence the Earth's radiative budget by scattering and absorbing incoming solar radiation. The optical properties of aerosols vary as a function of wavelength, but few measurements have reported the wavelength dependence of aerosol extinction cross sections and complex refractive indices. We describe a new laboratory instrument to measure aerosol optical extinction as a function of wavelength, using cavity enhanced spectroscopy with a broadband light source. The instrument consists of two broadband channels which span the 360–390 and 385–420 nm spectral regions using two light emitting diodes (LED) and a grating spectrometer with charge-coupled device (CCD) detector. We determined aerosol extinction cross sections and directly observed Mie scattering resonances for aerosols that are purely scattering (polystyrene latex spheres and ammonium sulfate), slightly absorbing (Suwannee River fulvic acid), and strongly absorbing (nigrosin dye). We describe an approach for retrieving refractive indices as a function of wavelength from the measured extinction cross sections over the 360–420 nm wavelength region. The retrieved refractive indices for PSL and ammonium sulfate agree within uncertainty with the literature values for this spectral region. The refractive index determined for nigrosin is 1.78 (± 0.03) + 0.19 (± 0.08)i at 360 nm and 1.63 (± 0.03) + 0.21 (± 0.05)i at 420 nm. The refractive index determined for Suwannee River fulvic acid is 1.71 (± 0.02) + 0.07 (± 0.06)i at 360 nm and 1.66 (± 0.02) + 0.06 (± 0.04)i at 420 nm. These laboratory results support the potential for a field instrument capable of determining ambient aerosol optical extinction, average aerosol extinction cross section, and complex refractive index as a function of wavelength

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Section: R a Washenfelder Et Al: Aerosol Extinction In The Uv Specsupporting

confidence: 87%

Section: Comparison Of Psl Refractive Index To Published Valuesmentioning

confidence: 94%

Broadband measurements of aerosol extinction in the ultraviolet spectral region

et al. 2013

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“…The real part of the refractive index returned by the program for the corrected data was 1.668, an increase of 2.5% on the value of 1.627 calculated if aerosol was assumed to fill the whole 90-cm length of the cavity. In both calculations, the imaginary part of the refractive index was taken as 5 × 10 −4 (Ma et al 2003). The potential systematic error introduced by considering the two extremes in the value of l is significantly higher than the 1% precision typically quoted in A-CRDS publications.…”

Section: Uncertainty In the Length Of The Aerosol Sample Within The Cmentioning

confidence: 99%

Sources of Error and Uncertainty in the Use of Cavity Ring Down Spectroscopy to Measure Aerosol Optical Properties

Miles

Rudić

Orr-Ewing

et al. 2011

Aerosol Science and Technology

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The use of cavity ring down spectroscopy to retrieve aerosol complex refractive index from optical property measurements has seen increasing popularity over the past few years. However, few studies have looked at the limit which sources of error and uncertainty inherent in the cavity ring down method place on the accuracy with which the refractive index can be retrieved. In this paper, we consider both experimental sources of error and those which compromise the theoretical models against which measurements are compared, both reviewing previously published work and presenting new data. Our results show that for absolute measurements made using single-cavity instruments, factors such as uncertainty in the length of the ring down cavity occupied by aerosol and the counting efficiency of the CPC can introduce an error of ∼2.5% into the real part of the refractive index retrieved from experiment. This is significantly higher than the typical 1% error quoted in previously published work. We note that due to the dependence of particle extinction efficiency on diameter, the effect of a given error on measurements for different particle sizes is not constant.

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“…One such approximation is the assumption of electrically large scatterer in the medium. In the results presented in this paper the scatterers are electrically large, ka ≈ [30, 165], where k is the wave number of the microspheres relative to the background material in the cuvette [10], and a is the average radius of the spheres. In this section, a review of the approximation employed in this paper is presented.…”

Section: Theorymentioning

confidence: 99%

Physical explanation of the SLIPI technique by the large scatterer approximation of the RTE

Kristensson

2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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Determination of complex refractive index of polystyrene microspheres from 370 to 1610 nm

Cited by 329 publications

References 15 publications

Broadband measurements of aerosol extinction in the ultraviolet spectral region

Broadband measurements of aerosol extinction in the ultraviolet spectral region

Sources of Error and Uncertainty in the Use of Cavity Ring Down Spectroscopy to Measure Aerosol Optical Properties

Physical explanation of the SLIPI technique by the large scatterer approximation of the RTE

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