Dear Fr.,

Nice hearing from you. One of the C-C in-phase (symmetric motion) ring stretching vibrations is called as 'ring breathing'. In this vibration, the displacement of atoms, which is seen similar to heart function during the breath. Ring all 'C-C' bonds are contract and relaxing, simultaneously. Kindly read following books to know more regards

1. The Infra-red Spectra of Complex Molecules - L.J. Bellamy

    Chapter - 5.4 Ring breathing vibrations

2. Introduction to Infrared and Raman Spectroscopy - N.B. Colthup

3. The Handbook of Infrared and Raman Characteristic Frequencies of Organic Molecules - Daimay Lin-Vien & Co-authors

Hope it may Useful

-Mani

thank you mani

fr