The Intro to Spectroscopy (UV–Vis, IR) – Advanced Concepts section explores the theoretical depth, molecular interpretation, and quantitative treatment of spectroscopic techniques used in chemical analysis. This module is designed for undergraduate Chemistry students and advanced school learners, with emphasis on mechanistic understanding, spectral reasoning, and exam-oriented problem solving.

In this section, you will study:

• Advanced theory of electromagnetic radiation–matter interaction

• Electronic transitions in UV–Vis spectroscopy – σ→σ*, π→π*, n→π*, n→σ* transitions and selection rules

• Chromophores and auxochromes – bathochromic and hypsochromic shifts, hyperchromic and hypochromic effects

• Quantitative UV–Vis analysis – deviations from Beer–Lambert law and multicomponent analysis (introductory)

• Vibrational theory in IR spectroscopy – harmonic vs anharmonic oscillators, fundamental vibrations, and overtones

• Effect of molecular structure on IR absorption – bond strength, reduced mass, hydrogen bonding, and conjugation

• IR spectral interpretation at UG level – fingerprint region analysis and functional group correlations

• Instrumental factors affecting resolution, sensitivity, and accuracy

• NCERT- and UG-aligned explanations, supported by derivations, spectral problem sets, assertion–reason MCQs, and PYQs

The content is structured to strengthen theoretical insight, improve spectral interpretation skills, and prepare students for UG examinations, viva voce, and competitive-level spectroscopy questions.

Develop a rigorous and analytical understanding of UV–Vis and IR spectroscopy to confidently interpret complex spectra and advanced analytical problems.