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Herein, these cross sections are analytically derived for a molecule\u2013nanoparticle system in which the molecule is excited to a radiating dipole by monochromatic incident radiation. These analytic cross sections were used in numerical calculations to model the UV\u2013vis spectrum of a 20\u00a0nm gold nanoparticle colloid with attached IR-808 variant dye molecules. The numerical results compared favorably with experimental spectra.<\/jats:p>","DOI":"10.1063\/5.0299923","type":"journal-article","created":{"date-parts":[[2025,12,16]],"date-time":"2025-12-16T11:30:48Z","timestamp":1765884648000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Absorption, scattering, and extinction cross sections of a nanosphere with adjacent molecule"],"prefix":"10.1063","volume":"163","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-4752-0179","authenticated-orcid":false,"given":"J.","family":"Case","sequence":"first","affiliation":[{"name":"Department of Physics, University of Colorado at Colorado Springs , Colorado Springs, Colorado 80918,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1721-5668","authenticated-orcid":false,"given":"A. 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