Extended Data Fig. 3: Oil droplets emulsion samples and sub-pixel spectral correction.
From: Water structure and electric fields at the interface of oil droplets
a, Oil droplets prepared with different concentrations. b, A sandwiched oil emulsion sample for confocal Raman micro-spectroscopy measurement. c, Size distribution of oil emulsions. DLS intensity-diameter distribution of 2% hexadecane droplets in ultrapure water. d, Setup of neon lamp on home-built Raman system for sub-pixel spectral correction. A neon lamp is placed above the sample stage, and the transmitted light is measured with the detection system of confocal Raman. A 600-nm short-pass filter is added to block emission peaks after 2100 cm−1. e, Top, typical neon emission spectrum, and bottom, neon emission spectrum with a 600-nm short-pass filter. f, Raman spectrum of water. Asterisk indicates the used emission line (~1700 cm−1) for Raman shift correction. g, Fitting the ~1702 cm−1 emission line with a Gaussian profile for spectral correction.
