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A high numerical aperture (NA) oil-immersion objective enabled depth-profiling through the near surface region (20 \u03bcm\u201340 \u03bcm) of irregularly shaped particles with an axial spatial resolution\u2009&lt;\u20092 \u03bcm estimated from measurements of instrument detection efficiency profiles. Changes in vibrational bands sensitive to polyethylene crystallinity were evident following treatments and linked to the release of low molecular weight compounds present as additives and products of processing. Effects of processing were probed by monitoring the rise of Raman scattering intensity in vibrational modes associated with polyethylene chains in a zig-zag (trans) conformation near 1128\u2005cm\n                    <jats:sup>\u20131<\/jats:sup>\n                    , 1294\u2005cm\n                    <jats:sup>\u20131<\/jats:sup>\n                    , and 1418\u2005cm\n                    <jats:sup>\u20131<\/jats:sup>\n                    , signaling chain clustering and development of organized, crystalline-like assemblies. Pristine LDPE particles displayed a uniform structure across the near surface region, while particles treated initially with chemical extractant and then further processed displayed increasingly enhanced crystallinity up to the maximum depth probed (40 \u03bcm). As a step toward measurements on ensembles of particles, least squares modeling was adapted to derive pure component spectra reflecting crystallinity change within spectral datasets. The work demonstrates high spatial resolution Raman depth-profiling for the characterization of processed polymers using a high NA immersion objective to overcome the limitations of air-objectives often used for confocal Raman microscopy.\n                  <\/jats:p>","DOI":"10.1177\/00037028251322142","type":"journal-article","created":{"date-parts":[[2025,3,13]],"date-time":"2025-03-13T10:10:43Z","timestamp":1741860643000},"page":"1346-1355","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Confocal Raman Microscopy as a Probe of Material Deconstruction in Processed Low-Density Polyethylene Particles"],"prefix":"10.1177","volume":"79","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-5592-551X","authenticated-orcid":false,"given":"Md.","family":"Wahiduzzaman","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7188-0728","authenticated-orcid":false,"given":"Jeremy","family":"Lawrence","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ashley","family":"Moreno-Gongora","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiahe","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dominick J.","family":"Casadonte","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5678-6669","authenticated-orcid":false,"given":"Gerardine G.","family":"Botte","sequence":"additional","affiliation":[{"name":"Institute for Sustainability and Circular Economy, Department of Chemical Engineering, Whitacre College of Engineering, Texas Tech University, Lubbock, Texas, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3672-0731","authenticated-orcid":false,"given":"Carol","family":"Korzeniewski","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2025,3,13]]},"reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.1700782"},{"key":"e_1_3_3_3_2","first-page":"369","article-title":"Predicted Growth in Plastic Waste Exceeds Efforts to Mitigate Plastic Pollution","author":"Borrelle S.B.","year":"2020","unstructured":"Borrelle S.B., Ringma J., Law K.L., Monnahan C.C., et al. \u201cPredicted Growth in Plastic Waste Exceeds Efforts to Mitigate Plastic Pollution\u201d. 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