Photoacoustics using radio-frequency laser-optogalvanic detection: a new technique for low-pressure photoacoustic spectroscopy. Magnetic predissociation of the state of I2

A new technique for low-pressure photoacoustic spectroscopy, one in which a low-power radio-frequency discharge is used as a sensitive acoustic-wave sensor, is presented. This contactless technique is a variation of the laser-optogalvanic method and is termed PARFLOG (photoacoustics using radio-frequency laser-optogalvanic detection).The ability to prosecute low-pressure photoacoustic measurement at a reduced level of collisional perturbations enables us to study intramolecular processes such as level crossings, predissociation, field effects, etc. Results for magnetic predissociation of the [Formula: see text] state of iodine are presented.