Accession Number:

AD0739310

Title:

Concerning the Optical Absorption Band of the Hydrated Electron,

Descriptive Note:

Corporate Author:

BRITISH COLUMBIA UNIV VANCOUVER DEPT OF CHEMISTRY

Report Date:

1971-01-01

Pagination or Media Count:

4.0

Abstract:

Photobleaching of hydrated electrons in liquid water has been attempted under the immense light flux of a Q-switched ruby laser. The 20 nanosecond ruby pulse was used as both the exciting light and a monitor for the absorbance of e-aq. Whereas stable solutions of organic dyes cryptocyanine and methylene blue showed marked nonlinear absorption due to saturation of optical transitions, no such change was observed for hydrated electrons even though the light intensity was varied by 10 to the 7th power up to 200 photons per hydrated electron per sq cm. Consequently the photoexcited state lifetime is estimated to be than 6 x 10 to the -12th power sec. This finding is discussed briefly in terms of three possible origins for the absorption band, namely that involving excitation to a bound excited state, as a photoionization efficiency profile or as a distribution of potential wells of various depths. Author

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE