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Here, we develop the third-order nonlinear spectroscopy signals for a purely electronic model of a molecular dimer, which is a prototype aggregate system. The model\u2014which focuses on excited-state absorption (ESA) pathways in two-dimensional electronic spectra\u2014reveals that orientational averaging leads to diagnostic ESA peak locations for H- and J-dimers. We constructed DNA-templated dimers of cyanine molecules as representative systems and used ultrabroadband two-dimensional electronic spectroscopy measurements to support the predicted signatures arising from the theoretical model. Fitting of steady-state spectra supports the assigned packing conformations. The results elucidate how ESA peaks can be diagnostic spectral signatures of packing conformation. This work lays the foundation for future studies that can include the complicating effects of vibronic states and additional electronic levels.<\/jats:p>","DOI":"10.1063\/5.0258934","type":"journal-article","created":{"date-parts":[[2025,5,1]],"date-time":"2025-05-01T10:24:34Z","timestamp":1746095074000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Distinguishing packing configurations of molecular dimers using excited-state absorption peaks in two-dimensional electronic spectra"],"prefix":"10.1063","volume":"162","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5279-9983","authenticated-orcid":false,"given":"Matthew S.","family":"Barclay","sequence":"first","affiliation":[{"name":"Micron School of Materials Science and Engineering, Boise State University 1 , Boise, Idaho 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