Photochemistry of formic acid monomer at 222 nm

✍ Scribed by Robert S. Irwin; Donald L. Singleton; George Paraskevopoulos; Robert McLaren

• Book ID: 102444424
• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 455 KB
• Volume: 26
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550260121

✦ Synopsis

The yields of COz and CO formed from the gas-phase photolysis at 222 nm of very low pressures of formic acid where the monomer predominates have been determined using FTIR spectroscopy. The observed ratio of COz/CO approaches unity as the formic acid pressure approaches zero. Previous studies have shown that the quantum yield for HCOOH + hu -OH + HCO (or H + CO) is 0.70 at 298 K. The present experimental results indicate that the ratio of the quantum yields of the possible molecular photolysis channels forming Hz + COz (&b) and HzO + CO (die) is ca. 1. Including this result in an analysis of previously reported quantum yields of CO and COz determined at higher pressures of formic acid, where both monomer and dimer contribute significantly to the products, indicates that 4 1 b = Cle = 0.