 Delmar S. Larsen

Delmar S. Larsen authored or curated a physical-chemistry treatment of harmonic vibrations and infrared spectroscopy. Its dipole-change criterion explains why a vibrational mode can exist without producing an ordinary infrared absorption line.

Anharmonic corrections also permit overtones absent from the simplest harmonic, linear-dipole selection rule. These distinctions connect a model's assumptions with the features actually seen in a spectrum.^[ref]

Homepage: chemistry.ucdavis.edu/people/delmar-larsen