Pump-probe laser photolytic fragmentation fluorescence spectrometry of methyl vinyl ketone, methacrolein and crotonaldehyde

✍ Scribed by Bobby J. Stanton; E.T. Monroe; E.L. Wehry

• Book ID: 102983424
• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 678 KB
• Volume: 299
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)00311-9

✦ Synopsis

The two-laser "pump-probe" photolytic fragmentation fluorescence spectrometry of methyl vinyl ketone, methacrolein and crotonaldehyde is described. Probe laser induced C, (Cl& -'A'& Deslandres-d'Azambuja band system) fluorescence is detected. The relative C, fluorescence intensity and spectral patterns exhibited by each C&O isomer are dependent upon the probe laser wavelength employed. The dependence of the fragment fluorescence signal intensity on the probe laser fluence implies that the "probe" laser induces photofragmentation of intermediate specie(s) produced by the "photolysis" laser. The vinyl radical (CH,) is believed to be an important intermediate produced from the C&O isomers by the photolysis laser, which can subsequently be converted to C, via the absorption of probe laser photons.