Experimental data for low-frequency transient absorption oscillations of gold nanoparticles

A low-frequency oscillation was observed when studying plasmonic gold nanoparticles (NPs) in 9:1 methanol:water using visible transient absorption spectroscopy. This dataset contains the data analyzing the nanoparticles and the time-resolved spectroscopy of the nanoparticles.<br>Data are given as comma-separated values (CSV), with the first line describing the quantity and unit of each column, or as NetCDF.<br><strong>Transmission electron microscopy</strong>Data analyzed from transmission electron micrographs of different nanoparticle samples.<em>TEM_NP_core.csv</em>: Measured nanoparticle core diameters and aspect ratios<em>TEM_NP_shell.csv</em>: Measured nanoparticle shell thicknesses<br><strong>Ultraviolet–visible spectroscopy</strong>UV/Vis absorbance spectra of different nanoparticle samples.<em>UV-Vis_NP.csv</em>: UV/Vis absorbance spectra of different nanoparticle samples<em>UV-Vis_NP.csv</em>: UV/Vis absorbance spectra of different nanoparticle samples before and after a transient absorption spectroscopy measurement with a pump power of 7 mW<br><strong>Visible transient absorption spectroscopy</strong>Absorbance change spectra of different nanoparticle samples in different solvent systems, as well as derived fits.<em>Vis-TA_33nm-bare-NP_solvents.nc</em>: Measured Vis-TA spectra and fits of 33 nm bare gold nanoparticles in water and 9:1 methanol:water with a pump power of 7 mW<em>Vis-TA_33nm-bare-NP_pump-power.nc</em>: Measured Vis-TA spectra and fits of 33 nm bare gold nanoparticles in 9:1 methanol:water at multiple pump powers<em>Vis-TA_33nm-core--shell-NP_pump-power.nc</em>: Measured Vis-TA spectra and fits of 33 nm gold–silica core–shell nanoparticles in 9:1 methanol:water at multiple pump powers<em>Vis-TA_57nm-bare-NP_pump-power.nc</em>: Measured Vis-TA spectra and fits of 57 nm bare gold nanoparticles in 9:1 methanol:water at multiple pump powers<em>Vis-TA_57nm-core--shell-NP_pump-power.nc</em>: Measured Vis-TA spectra and fits of 57 nm gold–silica core–shell nanoparticles in 9:1 methanol:water at multiple pump powers<em>Vis-TA_64nm-bare-NP_pump-power.nc</em>: Measured Vis-TA spectra and fits of 64 nm bare gold nanoparticles in 9:1 methanol:water at multiple pump powers<em>Vis-TA_64nm-core--shell-NP_pump-power.nc</em>: Measured Vis-TA spectra and fits of 64 nm gold–silica core–shell nanoparticles in 9:1 methanol:water at multiple pump powers<em>Vis-TA_79nm-bare-NP_pump-power.nc</em>: Measured Vis-TA spectra and fits of 79 nm bare gold nanoparticles in 9:1 methanol:water at multiple pump powers<em>Vis-TA_79nm-core--shell-NP_pump-power.nc</em>: Measured Vis-TA spectra and fits of 79 nm gold–silica core–shell nanoparticles in 9:1 methanol:water at multiple pump powers