Submission for the Cumhuriyet Science Journal (CSJ) Special Issue featuring selected papers presented at the 18th National Spectroscopy Congress with International Participation (USK2026) is now open. Authors are kindly requested to clearly indicate during submission and/or in their cover letter that the manuscript is intended for the "USK2026 Special Issue." Manuscript submission deadline: 30 September 2026. We look forward to receiving your high-quality contributions.