Abstract
The excited singlet state lifetimes of benzophenone vapour have been measured at shorter wavelengths than previous studies and with picosecond time resolution. Excitation was at a series of wavelengths from 313.5 nm to 284 nm, which gave S2(ΠΠ*) decay times of tens of picoseconds. We also report measurements of the polarisation anisotropy decay due to free rotation of excited state benzophenone. Time-dependent anisotropies calculated by both quantum mechanical and classical formulae are in good agreement with the experimental data and demonstrate benzophenone to behave as a rigid rotor. From the residual anisotropy, at long times, it is concluded that no rotation to vibrational energy transfer occurs during the excited state lifetime.
Highlights
The excited singlet state lifetimes of benzophenone vapour have been measured at shorter wavelengths than previous studies and with picosecond time resolution
Naaman et al.[5] used an experimental arrangement which removed the possibility of wall collisions or drift out of the detector region. They generated an effusive beam of benzophenone, detected the emission by observing along and perpendicularly to the beam direction, and measured only single exponential decays when the benzophenone was isolated in its excited state
In an effort to understand the excited state properties of benzophenone we have extended the range of measurements to shorter wavelengths than used previously and down to the picosecond region
Summary
The excited singlet state lifetimes of benzophenone vapour have been measured at shorter wavelengths than previous studies and with picosecond time resolution. They generated an effusive beam of benzophenone, detected the emission by observing along and perpendicularly to the beam direction, and measured only single exponential decays when the benzophenone was isolated in its excited state.
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