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In 2015, Campbell et al. (Nature 523, 322) presented spectroscopic laboratorygas phase data for the fullerene cation, C$_{60}^+$, that coincide withreported astronomical spectra of two diffuse interstellar band (DIB) featuresat 9633 and 9578 \AA. In the following year additional laboratory spectra werelinked to three other and weaker DIBs at 9428, 9366, and 9349 \AA. Thelaboratory data were obtained using wavelength-dependent photodissociationspectroscopy of small (up to three) He-tagged C$_{60}^+-$He$_n$ ion complexes,yielding rest wavelengths for the bare C$_{60}^+$ cation by correcting for theHe-induced wavelength shifts. Here we present an alternative approach to derivethe rest wavelengths of the four most prominent C$_{60}^+$ absorption features,using high resolution laser dissociation spectroscopy of C$_{60}^+$ embedded inultracold He droplets. Accurate wavelengths of the bare fullerene cation arederived based on linear wavelength shifts recorded for He$_n$C$_{60}^+$ specieswith $n$ up to 32. A careful analysis of all available data results in preciserest wavelengths (in air) for the four most prominent C$_{60}^+$ bands:9631.9(1) \AA, 9576.7(1) \AA, 9427.5(1) \AA, and 9364.9(1) \AA. Thecorresponding band widths have been derived and the relative band intensityratios are discussed.

C$_{60}^+$ and the Diffuse Interstellar Bands: An Independent Laboratory Check