@article {33103,
	title = {Predicting real refractive index of organic aerosols from elemental composition},
	journal = {Geophysical Research Letters},
	volume = {50},
	number = {12},
	year = {2023},
	pages = {e2023GL103446},
	abstract = {Abstract Accurate estimates of aerosol refractive index (RI) are critical for modeling aerosol-radiation interaction, yet this information is limited for ambient organic aerosols, leading to large uncertainties in estimating aerosol radiative effects. We present a semi-empirical model that predicts the real RI n of organic aerosol material from its widely measured oxygen-to-carbon (O:C) and hydrogen-to-carbon (H:C) elemental ratios. The model was based on the theoretical framework of Lorenz-Lorentz equation and trained with n-values at 589\&nbsp;nm () of 160 pure compounds. The predictions can be expanded to predict n-values in a wide spectrum between 300 and 1,200\&nbsp;nm. The model was validated with newly measured and literature datasets of n-values for laboratory secondary organic aerosol (SOA) materials. Uncertainties of predictions for all SOA samples are within 5\%. The model suggests that -values of organic aerosols may vary within a relatively small range for typical O:C and H:C values observed in the atmosphere.},
	isbn = {0094-8276},
	author = {Li, Yaowei and Bai, Bin and Dykema, John and Shin, Nara and Lambe, Andrew T. and Chen, Qi and Kuwata, Mikinori and Nga Lee Ng and Keutsch, Frank N and Liu, Pengfei}
}
