Photodissociation of HCOOH at 248nm

The photodissociation of HCOOH at 248nm was investigated by Time-Resolved Fourier Transform Infrared Spectroscopy （TR-FTIRS）. Infrared emissions from vibrationally excited products CO（v≤8）, CO₂ （v₃≤9） and H₂O（v） were detected and nascent vibrational population of CO and CO₂ was obtained. There was an apparent population inversion of CO₂, indicating a very fast process for HCOOH to dissociate into CO₂. It was found that the contribution of pathway to produce CO was larger than that to produce CO₂.