Polarized photofluorescence excitation spectroscopy: H2O revisited and the vacuum-ultraviolet photodissociation of D2O

✍ Scribed by Martyn T. MacPherson; John P. Simons

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 398 KB
• Volume: 51
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(77)80398-9

✦ Synopsis

The fluorescence excitation spectra of Hz0 and DzO have been recorded in the vacuum ultraviolet region, and the technique of polarized photofluorescence excitation spectroscopy has been applied to the photodissociations HzO, DzO -J-IZZJ(~ > 115 nm) -+ H, D + OH, OD (A '23. In the case of HzO, results obtained with major experimental improvements have necessitated the reappraisal of earlier polarization measurements, and some conclusions previously reached have been corrected. For both Hz0 and DzO, symmetry assignments based on the absorption spectra have been confirmed and, in addition, our results indicate a contribution from an electronic state not hitherto identified in optical spectroscopy. Polarization measurements for DzO suggest that the excited states populated at h > 126 nm are longer-lived than the corresponding states in H20.