Knowledge Bank

A photoacoustic apparatus has been assembled employing a piezoelectric pressure transducer in a pressurized (ca. 40 atm.) cell, and a cw $CO2$, laser providing about 1 watt on about 90 lines. The $u3$ (C-C stretching) vibrational mode of ethane has been studied. Preliminary observations include the spectrum of $(C2H6)2$ van der Waals molecule, and the collision-induced absorption spectra of $Ar-C2H6$ and $He-C2H6$ mixtures. The latter will be interpreted in terms of collisional dipole moments.